v3.26.1
Consolidated Schedule of Investments in and Advances to Affiliates (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 17,973 $ (29,545)  
Amount of Unrealized Gain/(Loss) (50,599) 63,190  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [1],[2],[3] 5,518,117    
Ending balance [4],[5],[6] 5,674,751    
Control investments      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 10,035 22  
Amount of Unrealized Gain/(Loss) (47,208) 401  
Amount of Interest, Fees or Dividends Credited to Income 61,664 56,242  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,569,626 [2],[7] 2,087,890  
Gross Additions 280,850 141,679  
Gross Reductions 267,466 56,613  
Ending balance 2,583,010 [5],[8] 2,172,956  
Affiliate investments      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 2,064  
Amount of Unrealized Gain/(Loss) 5,181 39,003  
Amount of Interest, Fees or Dividends Credited to Income 26,181 23,734  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 965,179 [2] 846,798  
Gross Additions 196,009 115,176  
Gross Reductions 105,530 68,980  
Ending balance $ 1,055,658 [5],[9] 899,326  
Investment, Identifier [Axis]: Fidelity Government Fund      
Schedule of Investments [Line Items]      
Total Rate 3.29%   3.43%
Investment, Identifier [Axis]: 2717 MH, L.P. | LP Interests (2717 GRE-LP, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   441  
Gross Additions   0  
Gross Reductions   0  
Ending balance   441  
Investment, Identifier [Axis]: 2717 MH, L.P. | LP Interests (2717 HPP-MS, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   383  
Gross Additions   0  
Gross Reductions   0  
Ending balance   383  
Investment, Identifier [Axis]: 2717 MH, L.P. | LP Interests (2717 MH, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (166)  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   8,818  
Gross Additions   80  
Gross Reductions   166  
Ending balance   8,732  
Investment, Identifier [Axis]: 423 HAR, LP | LP Interests (423 HAR, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   1,226  
Gross Additions   0  
Gross Reductions   0  
Ending balance   1,226  
Investment, Identifier [Axis]: AAC Holdings, Inc. | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[10],[11] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 [5],[9],[12] 0  
Investment, Identifier [Axis]: AAC Holdings, Inc. | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (2,060) 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,080 [2],[10],[11] 0  
Gross Additions 0 8,520  
Gross Reductions 2,060 0  
Ending balance $ 20 [5],[9],[12] $ 8,520  
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 21.00% [9],[12] 18.00% 20.00% [10],[11]
PIK Rate 21.00% [9],[12],[13] 18.00% 20.00% [10],[11],[14]
Amount of Realized Gain/(Loss)   $ (139)  
Amount of Unrealized Gain/(Loss)   3  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 895 [2],[10],[11] 609  
Gross Additions   0  
Gross Reductions   609  
Ending balance $ 1,083 [5],[9],[12] $ 0  
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 20.00%    
PIK Rate 20.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 45    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 895    
Gross Additions 45    
Gross Reductions 0    
Ending balance $ 940    
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Total Rate 20.00%    
PIK Rate 20.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (212)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,756    
Gross Additions 0    
Gross Reductions 212    
Ending balance $ 2,544    
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 1.3      
Schedule of Investments [Line Items]      
Total Rate 20.00%    
PIK Rate 20.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (212)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,756    
Gross Additions 0    
Gross Reductions 212    
Ending balance $ 2,544    
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 1.4      
Schedule of Investments [Line Items]      
Total Rate 21.00%    
PIK Rate 21.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 105    
Amount of Interest, Fees or Dividends Credited to Income 45    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 503    
Gross Additions 580    
Gross Reductions 0    
Ending balance $ 1,083    
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 20.00% [9],[12] 18.00% 21.00% [10],[11]
PIK Rate 20.00% [9],[12],[13] 18.00% 21.00% [10],[11],[14]
Amount of Realized Gain/(Loss)   $ (3,303)  
Amount of Unrealized Gain/(Loss)   80  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 503 [2],[10],[11] 17,365  
Gross Additions   0  
Gross Reductions   17,365  
Ending balance $ 940 [5],[9],[12] $ 0  
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 20.00% [9],[12],[15] 10.00% 20.00% [10],[11],[16]
PIK Rate 20.00% [9],[12],[13],[15] 10.00% 20.00% [10],[11],[14],[16]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 2,756 [2],[10],[11],[16] 0  
Gross Additions   3,109  
Gross Reductions   0  
Ending balance $ 2,544 [5],[9],[12],[15] $ 3,109  
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 20.00% [9],[12],[15] 10.00% 20.00% [10],[11],[16]
PIK Rate 20.00% [9],[12],[13],[15] 10.00% 20.00% [10],[11],[14],[16]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 2,756 [2],[10],[11],[16] 0  
Gross Additions   3,109  
Gross Reductions   0  
Ending balance 2,544 [5],[9],[12],[15] 3,109  
Investment, Identifier [Axis]: AAC Holdings, Inc. | Warrants      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   0  
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 729    
Ending balance [5],[19],[20] $ 570    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.50% [19],[20],[21],[22],[23]   5.50% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (35)    
Ending balance [5],[19],[20],[22],[23] $ (33)    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread 5.50% [19],[20],[21],[22],[23]   5.50% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (20)    
Ending balance [5],[19],[20],[22],[23] $ (19)    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.17% [19],[20],[23]   9.22% [17],[18],[26]
Spread 5.50% [19],[20],[21],[23]   5.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 9,800    
Ending balance [5],[19],[20],[23] 9,782    
Investment, Identifier [Axis]: AMEREQUIP LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[27] 0    
Ending balance [5],[19],[20],[28] $ 0    
Investment, Identifier [Axis]: ASC Interests, LLC | Member Units      
Schedule of Investments [Line Items]      
PIK Rate    
Amount of Realized Gain/(Loss) $ (1,500) 0  
Amount of Unrealized Gain/(Loss) 1,500 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 0  
Gross Additions 1,500 0  
Gross Reductions 1,500 0  
Ending balance 0 0  
Investment, Identifier [Axis]: ASC Interests, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) (88) 0  
Amount of Unrealized Gain/(Loss) 178 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 0  
Gross Additions 178 0  
Gross Reductions 178 0  
Ending balance 0 $ 0  
Investment, Identifier [Axis]: ASC Interests, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate   13.00% 13.00% [7],[29]
Amount of Realized Gain/(Loss) 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 10 13  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 400 [2],[7],[29] 400  
Gross Additions 0 0  
Gross Reductions 400 0  
Ending balance 0 $ 400  
Investment, Identifier [Axis]: ASC Interests, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate   13.00% 13.00% [7],[29]
Amount of Realized Gain/(Loss) 0 $ 0  
Amount of Unrealized Gain/(Loss) 30 0  
Amount of Interest, Fees or Dividends Credited to Income 37 53  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,502 [2],[7],[29] 1,598  
Gross Additions 31 0  
Gross Reductions 1,533 73  
Ending balance 0 1,525  
Investment, Identifier [Axis]: ATS Operating, LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 970    
Ending balance [5],[19],[20] $ 1,020    
Investment, Identifier [Axis]: ATS Operating, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.92% [19],[20],[23],[30]   10.22% [17],[18],[26],[31]
Spread 6.00% [19],[20],[21],[23],[30]   6.00% [17],[18],[24],[26],[31]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[31] $ 1,800    
Ending balance [5],[19],[20],[23],[30] $ 1,620    
Investment, Identifier [Axis]: ATS Operating, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 8.92% [19],[20],[23]   9.25% [17],[18],[26]
Spread 5.00% [19],[20],[21],[23]   5.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 6,660    
Ending balance [5],[19],[20],[23] $ 6,660    
Investment, Identifier [Axis]: ATS Operating, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.92% [19],[20],[23]   11.25% [17],[18],[26]
Spread 7.00% [19],[20],[21],[23]   7.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 6,660    
Ending balance [5],[19],[20],[23] 6,660    
Investment, Identifier [Axis]: ATS Workholding, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   $ 0  
Investment, Identifier [Axis]: ATS Workholding, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate   5.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (155)  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   113  
Gross Additions   42  
Gross Reductions   155  
Ending balance   $ 0  
Investment, Identifier [Axis]: ATS Workholding, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate   5.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (143)  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   143  
Gross Additions   0  
Gross Reductions   143  
Ending balance   0  
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[27] 920    
Ending balance [5],[19],[20],[28] $ 1,092    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 7.25% [19],[20],[21],[22],[23]   7.25% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (63)    
Ending balance [5],[19],[20],[22],[23] $ (56)    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26]     11.09%
Spread 7.25% [19],[20],[21],[22],[23]   7.25% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 23,451    
Ending balance [5],[19],[20],[22],[23] $ (33)    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 11.11%    
Spread 7.25% [19],[20],[21],[23]   7.25% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (38)    
Ending balance [5],[19],[20],[23] $ 23,296    
Investment, Identifier [Axis]: Adams Publishing Group, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.00% [19],[20],[23],[32]   11.00% [17],[18],[26],[33]
Spread 8.00% [19],[20],[21],[23],[32]   7.00% [17],[18],[24],[26],[33]
PIK Rate 1.00% [13],[19],[20],[23],[32]   1.00% [14],[17],[18],[26],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[33] $ 7,965    
Ending balance [5],[19],[20],[23],[32] $ 7,985    
Investment, Identifier [Axis]: Adams Publishing Group, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.00% [19],[20],[23],[32]   11.00% [17],[18],[26],[33]
Spread 8.00% [19],[20],[21],[23],[32]   7.00% [17],[18],[24],[26],[33]
PIK Rate 1.00% [13],[19],[20],[23],[32]   1.00% [14],[17],[18],[26],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[33] $ 775    
Ending balance [5],[19],[20],[23],[32] $ 761    
Investment, Identifier [Axis]: Adams Publishing Group, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 11.00% [19],[20],[23],[32]   11.00% [17],[18],[26],[33]
Spread 8.00% [19],[20],[21],[23],[32]   7.00% [17],[18],[24],[26],[33]
PIK Rate 1.00% [13],[19],[20],[23],[32]   1.00% [14],[17],[18],[26],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[33] $ 16,402    
Ending balance [5],[19],[20],[23],[32] 15,806    
Investment, Identifier [Axis]: Airo Purchaser, Inc. | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 1,521    
Ending balance [5],[19],[20] $ 1,650    
Investment, Identifier [Axis]: Airo Purchaser, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.25% [19],[20],[21],[22],[23]   5.25% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (63)    
Ending balance [5],[19],[20],[22],[23] $ (60)    
Investment, Identifier [Axis]: Airo Purchaser, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread 5.25% [19],[20],[21],[22],[23]   5.25% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (32)    
Ending balance [5],[19],[20],[22],[23] $ (30)    
Investment, Identifier [Axis]: Airo Purchaser, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 8.92% [19],[20],[23]   9.22% [17],[18],[26]
Spread 5.25% [19],[20],[21],[23]   5.25% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 27,269    
Ending balance [5],[19],[20],[23] $ 27,526    
Investment, Identifier [Axis]: American Health Staffing Group, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.25% [19],[20],[21],[22],[23]   5.00% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (2)    
Ending balance [5],[19],[20],[22],[23] $ (2)    
Investment, Identifier [Axis]: American Health Staffing Group, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00% [19],[20],[23]   11.75% [17],[18],[26]
Spread 5.25% [19],[20],[21],[23]   5.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 5,600    
Ending balance [5],[19],[20],[23] 5,376    
Investment, Identifier [Axis]: American Nuts, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (470) 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,250 [2],[7],[17] 0  
Gross Additions 0 8,970  
Gross Reductions 470 0  
Ending balance $ 3,780 [5],[8],[19] $ 8,970  
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.36% [8],[19],[23] 12.95% 12.64% [7],[17],[26]
Spread 8.50% [8],[19],[21],[23] 8.50% 8.50% [7],[17],[24],[26]
PIK Rate 12.36% [8],[13],[19],[23] 12.95% 12.64% [7],[14],[17],[26]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   11  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 8,161 [2],[7],[17],[26] 0  
Gross Additions   7,410  
Gross Reductions   0  
Ending balance $ 311 [5],[8],[19],[23] $ 7,410  
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 12.31%    
Spread 8.50%    
PIK Rate 12.31%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 251    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 8,161    
Gross Additions 251    
Gross Reductions 0    
Ending balance $ 8,412    
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Total Rate 12.31%    
Spread 8.50%    
PIK Rate 12.31%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 110    
Amount of Interest, Fees or Dividends Credited to Income 251    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,582    
Gross Additions 361    
Gross Reductions 0    
Ending balance $ 6,943    
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 1.3      
Schedule of Investments [Line Items]      
Total Rate 12.36%    
Spread 8.50%    
PIK Rate 12.36%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 311    
Gross Reductions 0    
Ending balance $ 311    
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.31% [8],[19],[23] 12.95% 12.64% [7],[17],[26]
Spread 8.50% [8],[19],[21],[23] 8.50% 8.50% [7],[17],[24],[26]
PIK Rate 12.31% [8],[13],[19],[23] 12.95% 12.64% [7],[14],[17],[26]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   11  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 6,582 [2],[7],[17],[26] 0  
Gross Additions   7,410  
Gross Reductions   0  
Ending balance $ 8,412 [5],[8],[19],[23] 7,410  
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [8],[19],[23] 12.31%    
Spread [8],[19],[21],[23] 8.50%    
PIK Rate [8],[13],[19],[23] 12.31%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[8],[19],[23] $ 6,943    
Investment, Identifier [Axis]: Amounts related to investments transferred to or from other 1940 Act classification during the period      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   3,452  
Amount of Unrealized Gain/(Loss)   (2,900)  
Amount of Interest, Fees or Dividends Credited to Income   (17)  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   (6,332)  
Gross Additions   0  
Gross Reductions   0  
Ending balance   0  
Investment, Identifier [Axis]: Amounts related to investments transferred to or from other 1940 Act classification during the period | Preferred Equity 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 0    
Ending balance 0    
Investment, Identifier [Axis]: Amounts related to investments transferred to or from other 1940 Act classification during the period | Preferred Equity 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 0    
Ending balance 0    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Preferred Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,030 [2],[7] 0  
Gross Additions   0  
Gross Reductions   0  
Ending balance 6,030 [5],[8] 0  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Preferred Member Units 1.1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 430    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 120    
Gross Additions 430    
Gross Reductions 0    
Ending balance 550    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Preferred Member Units 1.2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,030    
Gross Additions 0    
Gross Reductions 0    
Ending balance 6,030    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Preferred Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (160)  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 120 [2],[7] 5,300  
Gross Additions   0  
Gross Reductions   160  
Ending balance $ 550 [5],[8] 5,140  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.25% [8]   13.75% [7]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 129    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] 3,860    
Gross Additions 3    
Gross Reductions 153    
Ending balance [5],[8] 3,710    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   $ 0  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate   17.50%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   180  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   4,048  
Gross Additions   3  
Gross Reductions   50  
Ending balance   4,001  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Warrants      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[34] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 [5],[8],[35] 0  
Investment, Identifier [Axis]: ArborWorks, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 0    
Ending balance [5],[19],[20] 0    
Investment, Identifier [Axis]: ArborWorks, LLC | Preferred Equity 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 16,659    
Ending balance [5],[19],[20] 17,427    
Investment, Identifier [Axis]: ArborWorks, LLC | Preferred Equity 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 0    
Ending balance [5],[19],[20] $ 0    
Investment, Identifier [Axis]: ArborWorks, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 15.00% [19],[20]   15.00% [17],[18]
PIK Rate 15.00% [13],[19],[20]   15.00% [14],[17],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] $ 4,177    
Ending balance [5],[19],[20] $ 4,336    
Investment, Identifier [Axis]: ArborWorks, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.28% [19],[20],[23]   10.34% [17],[18],[26]
Spread 6.50% [19],[20],[21],[23]   6.50% [17],[18],[24],[26]
PIK Rate 10.28% [13],[19],[20],[23]   10.34% [14],[17],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 8,985    
Ending balance [5],[19],[20],[23] 9,218    
Investment, Identifier [Axis]: Archer Systems, LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[27] 2,450    
Ending balance [5],[19],[20],[28] 2,450    
Investment, Identifier [Axis]: Auria Space, LLC | Member Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20] $ 3,040    
Investment, Identifier [Axis]: Auria Space, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.00% [19],[20],[21],[22],[23]   5.00% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (168)    
Ending balance [5],[19],[20],[22],[23] $ (160)    
Investment, Identifier [Axis]: Auria Space, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 8.68%    
Spread 5.00% [19],[20],[21],[23]   5.00% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (299)    
Ending balance [5],[19],[20],[23] $ 59,943    
Investment, Identifier [Axis]: Auria Space, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 8.68% [19],[20],[23]   8.72% [17],[18],[26]
Spread 5.00% [19],[20],[21],[23]   5.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 56,163    
Ending balance [5],[19],[20],[23] 55,729    
Investment, Identifier [Axis]: B-O-F Corporation | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 249    
Ending balance [5],[19],[20] $ 249    
Investment, Identifier [Axis]: B-O-F Corporation | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.75% [19],[20],[21],[22],[23]   5.75% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (17)    
Ending balance [5],[19],[20],[22],[23] $ (16)    
Investment, Identifier [Axis]: B-O-F Corporation | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 8.41% [19],[20],[23]   8.74% [17],[18],[26]
Spread 4.75% [19],[20],[21],[23]   4.75% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 3,912    
Ending balance [5],[19],[20],[23] $ 3,915    
Investment, Identifier [Axis]: B-O-F Corporation | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.41% [19],[20],[23]   10.74% [17],[18],[26]
Spread 6.75% [19],[20],[21],[23]   6.75% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 3,912    
Ending balance [5],[19],[20],[23] 3,915    
Investment, Identifier [Axis]: BDB Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (4,860) 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,640 [2],[7] 18,920  
Gross Additions 0 0  
Gross Reductions 4,860 0  
Ending balance $ 7,780 [5],[8] $ 18,920  
Investment, Identifier [Axis]: BDB Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.00% [8] 12.00% 12.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 53 4  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,773 [2],[7] 0  
Gross Additions 0 420  
Gross Reductions 0 0  
Ending balance 1,773 [5],[8] 420  
Investment, Identifier [Axis]: BLI Acquisition, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 2,100    
Gross Reductions 0    
Ending balance [5],[9] $ 2,100    
Investment, Identifier [Axis]: BLI Acquisition, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [9] 14.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 566    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 13,072    
Gross Reductions 0    
Ending balance [5],[9] 13,072    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 9,910    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26]     9.75%
Spread [17],[18],[24],[26]     5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] 25,673    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26]     9.83%
Spread [17],[18],[24],[26]     5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] 9,410    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26]     9.84%
Spread [17],[18],[24],[26]     5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] 14,899    
Investment, Identifier [Axis]: Barfly Ventures, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (100)  
Amount of Interest, Fees or Dividends Credited to Income   1,103  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   5,860  
Gross Additions   0  
Gross Reductions   100  
Ending balance   $ 5,760  
Investment, Identifier [Axis]: Barfly Ventures, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   7.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   12  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   711  
Gross Additions   0  
Gross Reductions   0  
Ending balance   711  
Investment, Identifier [Axis]: Batjer TopCo, LLC | Preferred Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 620 0  
Amount of Interest, Fees or Dividends Credited to Income 583 188  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 8,750 [2],[7],[27] 5,160  
Gross Additions 620 0  
Gross Reductions 0 0  
Ending balance 9,370 [5],[8],[28] $ 5,160  
Investment, Identifier [Axis]: Batjer TopCo, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate   11.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   10  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25] 446  
Gross Additions   0  
Gross Reductions   270  
Ending balance 0 [5],[8],[22] $ 176  
Investment, Identifier [Axis]: Batjer TopCo, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 0    
Investment, Identifier [Axis]: Batjer TopCo, LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Total Rate 10.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (5)    
Amount of Interest, Fees or Dividends Credited to Income 251    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 9,945    
Gross Additions 6    
Gross Reductions 118    
Ending balance 9,833    
Investment, Identifier [Axis]: Batjer TopCo, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate   11.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   7  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25] 270  
Gross Additions   0  
Gross Reductions   0  
Ending balance $ 0 [5],[8],[22] $ 270  
Investment, Identifier [Axis]: Batjer TopCo, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.00% [8] 11.00% 10.00% [7]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   279  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 9,945 [2],[7] 10,529  
Gross Additions   5  
Gross Reductions   0  
Ending balance 9,833 [5],[8] 10,534  
Investment, Identifier [Axis]: Behavior Development Group Holdings | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 300    
Ending balance [5],[19],[20] $ 300    
Investment, Identifier [Axis]: Behavior Development Group Holdings | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23],[30] 9.67%    
Spread 6.00% [19],[20],[21],[23],[30]   6.00% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (22)    
Ending balance [5],[19],[20],[23],[30] $ 579    
Investment, Identifier [Axis]: Behavior Development Group Holdings | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.70% [19],[20],[23]   9.70% [17],[18],[26]
Spread 6.00% [19],[20],[21],[23]   6.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 9,454    
Ending balance [5],[19],[20],[23] 9,438    
Investment, Identifier [Axis]: Berry Aviation, Inc. | Preferred Member Units 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[36] 0    
Ending balance [5],[19],[20],[37] 0    
Investment, Identifier [Axis]: Berry Aviation, Inc. | Preferred Member Units 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[36] 0    
Ending balance [5],[19],[20],[37] 0    
Investment, Identifier [Axis]: Berry Aviation, Inc. | Preferred Member Units 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[36] 0    
Ending balance [5],[19],[20],[37] 0    
Investment, Identifier [Axis]: Bettercloud, Inc. | Common Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) (5,704)    
Amount of Unrealized Gain/(Loss) 1,200    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[17] 15,690    
Gross Additions 1,200    
Gross Reductions 16,890    
Ending balance $ 0    
Investment, Identifier [Axis]: Bettercloud, Inc. | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [7],[17],[26],[31]     12.07%
Spread 8.25%   8.25% [7],[17],[24],[26],[31]
PIK Rate [7],[14],[17],[26],[31]     12.07%
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 310    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[17],[26],[31] 6,017    
Gross Additions 2,307    
Gross Reductions 8,324    
Ending balance 0    
Investment, Identifier [Axis]: Bluestem Brands, Inc. | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18] 0    
Ending balance [5],[12],[20] $ 0    
Investment, Identifier [Axis]: Bluestem Brands, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.28% [12],[15],[20],[23]   12.49% [10],[16],[18],[26]
Spread 8.50% [12],[15],[20],[21],[23]   8.50% [10],[16],[18],[24],[26]
PIK Rate 11.28% [12],[13],[15],[20],[23]   11.49% [10],[14],[16],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[16],[18],[26] $ 239    
Ending balance [5],[12],[15],[20],[23] $ 248    
Investment, Identifier [Axis]: Bluestem Brands, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.25% [12],[15],[20],[23]   14.25% [10],[16],[18],[26]
Spread 7.50% [12],[15],[20],[21],[23]   7.50% [10],[16],[18],[24],[26]
PIK Rate 13.25% [12],[13],[15],[20],[23]   13.25% [10],[14],[16],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[16],[18],[26] $ 182    
Ending balance [5],[12],[15],[20],[23] $ 89    
Investment, Identifier [Axis]: Bluestem Brands, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 12.28% [12],[15],[20],[23]   12.49% [10],[16],[18],[26]
Spread 8.50% [12],[15],[20],[21],[23]   8.50% [10],[16],[18],[24],[26]
PIK Rate 11.28% [12],[13],[15],[20],[23]   11.49% [10],[14],[16],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[16],[18],[26] $ 0    
Ending balance [5],[12],[15],[20],[23] 0    
Investment, Identifier [Axis]: Bluestem Brands, Inc. | Warrants      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18],[34] 0    
Ending balance [5],[12],[20],[35] 0    
Investment, Identifier [Axis]: Boccella Precast Products LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (190) 810  
Amount of Interest, Fees or Dividends Credited to Income 0 140  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,820 [2],[11],[27] 310  
Gross Additions 0 810  
Gross Reductions 190 0  
Ending balance $ 2,630 [5],[9],[28] $ 1,120  
Investment, Identifier [Axis]: Boccella Precast Products LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.00% [9] 10.00% 10.00% [11]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 8  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 256 [2],[11] 266  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 256 [5],[9] $ 266  
Investment, Identifier [Axis]: Bolder Panther Group, LLC | Class B Preferred Member Units      
Schedule of Investments [Line Items]      
Total Rate 8.00% [8],[28] 8.00% 8.00% [7],[27]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 480  
Amount of Interest, Fees or Dividends Credited to Income 621 795  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 31,190 [2],[7],[27] 30,520  
Gross Additions 0 480  
Gross Reductions 0 0  
Ending balance $ 31,190 [5],[8],[28] $ 31,000  
Investment, Identifier [Axis]: Bolder Panther Group, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.09% [8],[23],[38]   11.10% [7],[26],[39]
Spread 8.40% [8],[21],[23],[38]   7.22% [7],[24],[26],[39]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[26],[39] $ 101,046    
Ending balance [5],[8],[23],[38] $ 101,046    
Investment, Identifier [Axis]: Bolder Panther Group, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.09% 11.70%  
Spread 8.40% 7.33%  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (33) (35)  
Amount of Interest, Fees or Dividends Credited to Income 3,092 2,987  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 101,046 101,643  
Gross Additions 33 34  
Gross Reductions 33 631  
Ending balance 101,046 101,046  
Investment, Identifier [Axis]: Bolder Panther Group, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 32 40  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 0  
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[40],[41] 0    
Ending balance [5],[19],[20],[42],[43] 0    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[40],[41] 550    
Ending balance [5],[19],[20],[42],[43] $ 610    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.56% [19],[20],[23],[42],[43]   9.89% [17],[18],[26],[40],[41]
Spread 5.75% [19],[20],[21],[23],[42],[43]   5.75% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 571    
Ending balance [5],[19],[20],[23],[42],[43] $ 571    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.56% [19],[20],[23],[42],[43]   9.59% [17],[18],[26],[40],[41]
Spread 5.75% [19],[20],[21],[23],[42],[43]   5.75% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 1,396    
Ending balance [5],[19],[20],[23],[42],[43] $ 1,392    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 8.56% [19],[20],[23],[42],[43]   8.89% [17],[18],[26],[40],[41]
Spread 4.75% [19],[20],[21],[23],[42],[43]   4.75% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 6,277    
Ending balance [5],[19],[20],[23],[42],[43] $ 6,261    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 10.56% [19],[20],[23],[42],[43]   10.89% [17],[18],[26],[40],[41]
Spread 6.75% [19],[20],[21],[23],[42],[43]   6.75% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 6,277    
Ending balance [5],[19],[20],[23],[42],[43] $ 6,261    
Investment, Identifier [Axis]: Brainworks Software, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 14.00% [15],[19],[20],[23],[44]   14.75% [16],[17],[18],[26],[29]
Spread 7.25% [15],[19],[20],[21],[23],[44]   7.25% [16],[17],[18],[24],[26],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[16],[17],[18],[26],[29] $ 0    
Ending balance [5],[15],[19],[20],[23],[44] $ 0    
Investment, Identifier [Axis]: Brainworks Software, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.00% [15],[19],[20],[23],[44]   14.75% [16],[17],[18],[26],[29]
Spread 7.25% [15],[19],[20],[21],[23],[44]   7.25% [16],[17],[18],[24],[26],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[16],[17],[18],[26],[29] $ 0    
Ending balance [5],[15],[19],[20],[23],[44] 0    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (570)  
Amount of Interest, Fees or Dividends Credited to Income   30  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   4,680  
Gross Additions   0  
Gross Reductions   570  
Ending balance   $ 4,110  
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC | Preferred Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (490)    
Amount of Interest, Fees or Dividends Credited to Income 30    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[27] 3,460    
Gross Additions 0    
Gross Reductions 490    
Ending balance [5],[8],[28] $ 2,970    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC | Preferred Member Units 2      
Schedule of Investments [Line Items]      
Total Rate 15.00% [8],[28]   15.00% [7],[27]
PIK Rate 15.00% [8],[13],[28]   15.00% [7],[14],[27]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 12    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[27] 336    
Gross Additions 12    
Gross Reductions 0    
Ending balance [5],[8],[28] $ 348    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.79% [8],[23] 14.48% 13.98% [7],[26]
Spread 10.00% [8],[21],[23] 10.00% 10.00% [7],[24],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 173 181  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,016 [2],[7],[26] 5,016  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 5,016 [5],[8],[23] 5,016  
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[36] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 [5],[8],[37] 0  
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation | Warrants      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[34] 0    
Ending balance [5],[8],[35] 0    
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation | Warrants 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 0  
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation | Warrants 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 $ 0  
Investment, Identifier [Axis]: Brightwood Capital Fund Investments | LP Interests (Brightwood Capital Fund III, LP)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[40],[45],[46] 2,692    
Ending balance [5],[20],[42],[47],[48] 2,607    
Investment, Identifier [Axis]: Brightwood Capital Fund Investments | LP Interests (Brightwood Capital Fund IV, LP)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[27],[40],[45],[46] 3,224    
Ending balance [5],[20],[28],[42],[47],[48] 3,224    
Investment, Identifier [Axis]: Brightwood Capital Fund Investments | LP Interests (Brightwood Capital Fund V, LP)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[27],[40],[45],[46] 5,146    
Ending balance [5],[20],[28],[42],[47],[48] $ 5,146    
Investment, Identifier [Axis]: Buca C, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Total Rate 6.00% [9] 6.00% 6.00% [11]
PIK Rate 6.00% [9],[13] 6.00% 6.00% [11],[14]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[11] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[9] $ 0  
Investment, Identifier [Axis]: Buca C, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 15.00% [9],[15],[44] 15.00% 15.00% [11],[16],[29]
PIK Rate 15.00% [9],[13],[15],[44] 15.00% 15.00% [11],[14],[16],[29]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[11],[16],[29] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[9],[15],[44] $ 0  
Investment, Identifier [Axis]: Buca C, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 15.00% [9],[15],[44] 15.00% 15.00% [11],[16],[29]
PIK Rate 15.00% [9],[13],[15],[44] 15.00% 15.00% [11],[14],[16],[29]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (51) 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[11],[16],[29] 0  
Gross Additions 51 0  
Gross Reductions 51 0  
Ending balance $ 0 [5],[9],[15],[44] $ 0  
Investment, Identifier [Axis]: Buca C, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 15.00% [9],[15],[44] 15.00% 15.00% [11],[16],[29]
PIK Rate 15.00% [9],[13],[15],[44] 15.00% 15.00% [11],[14],[16],[29]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (368)  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 0 [2],[11],[16],[29] 0  
Gross Additions   368  
Gross Reductions   368  
Ending balance 0 [5],[9],[15],[44] 0  
Investment, Identifier [Axis]: CBT Nuggets, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (2,360) 0  
Amount of Interest, Fees or Dividends Credited to Income 412 824  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 47,930 [2],[7],[27] 49,540  
Gross Additions 0 0  
Gross Reductions 2,360 0  
Ending balance 45,570 [5],[8],[28] 49,540  
Investment, Identifier [Axis]: CGMS Parent LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 195    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 10,000    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[9],[28] 10,000    
Investment, Identifier [Axis]: CGMS Parent LLC | Secured Debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[25] (39)    
Ending balance [5],[9],[22] $ (37)    
Investment, Identifier [Axis]: CGMS Parent LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 13.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 821    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 24,754    
Gross Additions 14    
Gross Reductions 156    
Ending balance 24,612    
Investment, Identifier [Axis]: CGMS Parent LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 7    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (39)    
Gross Additions 2    
Gross Reductions 0    
Ending balance $ (37)    
Investment, Identifier [Axis]: CGMS Parent LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [9]   13.00% [11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] $ 24,754    
Ending balance [5],[9] $ 24,612    
Investment, Identifier [Axis]: CQ Fluency, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.50% [19],[20],[21],[22],[23]   6.75% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (28)    
Ending balance [5],[19],[20],[22],[23] $ (24)    
Investment, Identifier [Axis]: CQ Fluency, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.30% [19],[20],[23]   10.52% [17],[18],[26]
Spread 6.50% [19],[20],[21],[23]   6.75% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 10,266    
Ending balance [5],[19],[20],[23] $ 10,125    
Investment, Identifier [Axis]: CRC Evans USA Bidco, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26],[31],[40],[41]     10.87%
Spread 6.75% [19],[20],[21],[22],[23],[42],[43]   6.75% [17],[18],[24],[26],[31],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[31],[40],[41] $ 6,838    
Ending balance [5],[19],[20],[22],[23],[42],[43] $ 0    
Investment, Identifier [Axis]: CRC Evans USA Bidco, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread 6.75% [19],[20],[21],[22],[23],[42],[43]   6.75% [17],[18],[24],[25],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[40],[41] $ (280)    
Ending balance [5],[19],[20],[22],[23],[42],[43] $ (260)    
Investment, Identifier [Axis]: CRC Evans USA Bidco, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.71% [19],[20],[23],[42],[43]   10.70% [17],[18],[26],[40],[41]
Spread 6.75% [19],[20],[21],[23],[42],[43]   6.75% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 9,355    
Ending balance [5],[19],[20],[23],[42],[43] $ 9,419    
Investment, Identifier [Axis]: CRC Evans USA Bidco, Inc. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 10.71% [19],[20],[23],[42],[43]   10.83% [17],[18],[26],[40],[41]
Spread 6.75% [19],[20],[21],[23],[42],[43]   6.75% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 14,949    
Ending balance [5],[19],[20],[23],[42],[43] $ 14,756    
Investment, Identifier [Axis]: Café Brazil, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (100)  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   1,200  
Gross Additions   0  
Gross Reductions   100  
Ending balance   1,100  
Investment, Identifier [Axis]: California Splendor Holdings LLC | Preferred Member Units 1      
Schedule of Investments [Line Items]      
Total Rate 15.00% [8],[28]   15.00% [7],[27]
PIK Rate 15.00% [8],[13],[28]   15.00% [7],[14],[27]
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   63  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 12,569 [2],[7],[27] 22,215  
Gross Additions   0  
Gross Reductions   0  
Ending balance 16,107 [5],[8],[28] $ 22,215  
Investment, Identifier [Axis]: California Splendor Holdings LLC | Preferred Member Units 1.1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (4,410)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,801    
Gross Additions 0    
Gross Reductions 4,410    
Ending balance $ 8,391    
Investment, Identifier [Axis]: California Splendor Holdings LLC | Preferred Member Units 1.2      
Schedule of Investments [Line Items]      
Total Rate 15.00%    
PIK Rate 15.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 539    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,569    
Gross Additions 3,538    
Gross Reductions 0    
Ending balance 16,107    
Investment, Identifier [Axis]: California Splendor Holdings LLC | Preferred Member Units 2      
Schedule of Investments [Line Items]      
Total Rate   15.00%  
PIK Rate   15.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   409  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,801 [2],[7],[27] 10,909  
Gross Additions   409  
Gross Reductions   0  
Ending balance 8,391 [5],[8],[28] $ 11,318  
Investment, Identifier [Axis]: California Splendor Holdings LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate   14.00%  
PIK Rate   4.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   388  
Amount of Interest, Fees or Dividends Credited to Income   984  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (11) [2],[7],[25] 28,465  
Gross Additions   582  
Gross Reductions   1,092  
Ending balance $ (10) [5],[8],[22] $ 27,955  
Investment, Identifier [Axis]: California Splendor Holdings LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 14.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (249)    
Amount of Interest, Fees or Dividends Credited to Income 905    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 25,638    
Gross Additions 2    
Gross Reductions 249    
Ending balance 25,391    
Investment, Identifier [Axis]: California Splendor Holdings LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (11)    
Gross Additions 1    
Gross Reductions 0    
Ending balance $ (10)    
Investment, Identifier [Axis]: California Splendor Holdings LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.00% [8]   14.00% [7]
PIK Rate   4.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   40  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 25,638 [2],[7] 1,506  
Gross Additions   14  
Gross Reductions   1,539  
Ending balance 25,391 [5],[8] (19)  
Investment, Identifier [Axis]: Career Team Holdings, LLC | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,370 [2],[11] 4,740  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 5,370 [5],[9] $ 4,740  
Investment, Identifier [Axis]: Career Team Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate   10.38%  
Spread 6.00% [9],[21],[22],[23] 6.00% 6.00% [11],[24],[25],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 5 42  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (45) [2],[11],[25],[26] 887  
Gross Additions 2 902  
Gross Reductions 0 0  
Ending balance $ (43) [5],[9],[22],[23] $ 1,789  
Investment, Identifier [Axis]: Career Team Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [9] 12.50% 13.00% [11]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 731 617  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 21,551 [2],[11] 19,364  
Gross Additions 19 11  
Gross Reductions 0 203  
Ending balance 21,570 [5],[9] 19,172  
Investment, Identifier [Axis]: CaseWorthy, Inc. | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 710    
Ending balance [5],[19],[20] 710    
Investment, Identifier [Axis]: CenterPeak Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 1,240    
Amount of Interest, Fees or Dividends Credited to Income 1,141    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[27] 24,340    
Gross Additions 1,240    
Gross Reductions 0    
Ending balance [5],[9],[28] $ 25,580    
Investment, Identifier [Axis]: CenterPeak Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 15.00% [9]   15.00% [11]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (2)    
Amount of Interest, Fees or Dividends Credited to Income 71    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 1,800    
Gross Additions 2    
Gross Reductions 2    
Ending balance [5],[9] $ 1,800    
Investment, Identifier [Axis]: CenterPeak Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 15.00% [9]   15.00% [11]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (1)    
Amount of Interest, Fees or Dividends Credited to Income 943    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 25,107    
Gross Additions 1    
Gross Reductions 1    
Ending balance [5],[9] 25,107    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 3,230 1,870  
Amount of Interest, Fees or Dividends Credited to Income 30 30  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 42,710 [2],[7] 12,410  
Gross Additions 3,230 1,870  
Gross Reductions 0 0  
Ending balance $ 45,940 [5],[8] $ 14,280  
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 8.00% [8],[21],[22],[23] 10.00% 8.00% [7],[24],[25],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 5 3  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25],[26] 0  
Gross Additions 240 0  
Gross Reductions 240 0  
Ending balance $ 0 [5],[8],[22],[23] $ 0  
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.79% [8],[23] 14.48% 11.98% [7],[26]
Spread 8.00% [8],[21],[23] 10.00% 8.00% [7],[24],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (3) (5)  
Amount of Interest, Fees or Dividends Credited to Income 714 876  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 24,085 [2],[7],[26] 25,534  
Gross Additions 3 5  
Gross Reductions 3 1,075  
Ending balance 24,085 [5],[8],[23] 24,464  
Investment, Identifier [Axis]: Chamberlin Holding LLC | Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 3,980 1,130  
Amount of Interest, Fees or Dividends Credited to Income 1,523 2,791  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 35,530 [2],[7],[27] 33,110  
Gross Additions 3,980 1,130  
Gross Reductions 0 0  
Ending balance 39,510 [5],[8],[28] 34,240  
Investment, Identifier [Axis]: Chamberlin Holding LLC | Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (90) 80  
Amount of Interest, Fees or Dividends Credited to Income 23 23  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,170 [2],[7],[27],[36] 3,550  
Gross Additions 0 80  
Gross Reductions 90 0  
Ending balance $ 4,080 [5],[8],[28],[37] $ 3,630  
Investment, Identifier [Axis]: Chamberlin Holding LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [8],[21],[22],[23] 6.00% 6.00% [7],[24],[25],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (3) (22)  
Amount of Interest, Fees or Dividends Credited to Income 9 24  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25],[26] 0  
Gross Additions 3 22  
Gross Reductions 3 22  
Ending balance $ 0 [5],[8],[22],[23] $ 0  
Investment, Identifier [Axis]: Chamberlin Holding LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.86% [8],[23] 12.49% 11.99% [7],[26]
Spread 8.00% [8],[21],[23] 8.00% 8.00% [7],[24],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (23) 3  
Amount of Interest, Fees or Dividends Credited to Income 1,268 503  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 42,020 [2],[7],[26] 15,620  
Gross Additions 23 1,600  
Gross Reductions 823 0  
Ending balance $ 41,220 [5],[8],[23] 17,220  
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.66% [19],[20],[23],[30]   10.84% [17],[18],[26],[31]
Spread 6.75% [19],[20],[21],[23],[30]   6.75% [17],[18],[24],[26],[31]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[31] $ 7,250    
Ending balance [5],[19],[20],[23],[30] $ 4,764    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.64% [19],[20],[23]   10.84% [17],[18],[26]
Spread 6.75% [19],[20],[21],[23]   6.75% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 35,794    
Ending balance [5],[19],[20],[23] $ 35,701    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.64% [19],[20],[23]   10.84% [17],[18],[26]
Spread 6.75% [19],[20],[21],[23]   6.75% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 1,983    
Ending balance [5],[19],[20],[23] $ 1,978    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 10.64% [19],[20],[23]   10.84% [17],[18],[26]
Spread 6.75% [19],[20],[21],[23]   6.75% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 4,793    
Ending balance [5],[19],[20],[23] 4,781    
Investment, Identifier [Axis]: Charps, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 329  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 16,020 [2],[7],[27] 15,580  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 16,020 [5],[8],[28] $ 15,580  
Investment, Identifier [Axis]: Charps, LLC | Unsecured Debt      
Schedule of Investments [Line Items]      
Total Rate 14.00% [8] 10.00% 14.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (26) (23)  
Amount of Interest, Fees or Dividends Credited to Income 223 219  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,694 [2],[7] 5,694  
Gross Additions 26 23  
Gross Reductions 26 23  
Ending balance 5,694 [5],[8] 5,694  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 770 50  
Amount of Interest, Fees or Dividends Credited to Income 423 443  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 14,120 [2],[7],[27] 10,990  
Gross Additions 770 50  
Gross Reductions 0 0  
Ending balance 14,890 [5],[8],[28] 11,040  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 240 320  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,270 [2],[7],[36] 950  
Gross Additions 240 320  
Gross Reductions 0 0  
Ending balance 1,510 [5],[8],[37] 1,270  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 9 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[8],[22] $ 0  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00% [8] 9.00% 10.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (6) 2  
Amount of Interest, Fees or Dividends Credited to Income 239 159  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 9,480 [2],[7] 6,760  
Gross Additions 6 0  
Gross Reductions 246 240  
Ending balance $ 9,240 [5],[8] $ 6,520  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.00% [8] 10.00% 10.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 23 24  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 929 [2],[7] 973  
Gross Additions 0 0  
Gross Reductions 12 11  
Ending balance 917 [5],[8] 962  
Investment, Identifier [Axis]: Clarius BIGS, LLC | Secured Debt      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[16],[17],[18],[29] 8    
Ending balance [5],[15],[19],[20],[44] 8    
Investment, Identifier [Axis]: Classic H&G Holdings, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 90 (210)  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,040 [2],[11] 2,850  
Gross Additions 90 0  
Gross Reductions 0 210  
Ending balance 2,130 [5],[9] 2,640  
Investment, Identifier [Axis]: Cody Pools, Inc. | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (790) 1,690  
Amount of Interest, Fees or Dividends Credited to Income 389 1,284  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 65,060 [2],[7],[27],[36] 67,810  
Gross Additions 0 1,690  
Gross Reductions 790 0  
Ending balance 64,270 [5],[8],[28],[37] 69,500  
Investment, Identifier [Axis]: Cody Pools, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 5 (2)  
Amount of Interest, Fees or Dividends Credited to Income 27 7  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25] 0  
Gross Additions 1,685 2  
Gross Reductions 1,685 2  
Ending balance $ 0 [5],[8],[22] $ 0  
Investment, Identifier [Axis]: Cody Pools, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.50% [8] 12.50% 12.50% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (39) (3)  
Amount of Interest, Fees or Dividends Credited to Income 1,111 1,201  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 34,901 [2],[7] 39,227  
Gross Additions 40 3  
Gross Reductions 681 1,515  
Ending balance 34,260 [5],[8] 37,715  
Investment, Identifier [Axis]: Colonial Electric Company LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 2,120 760  
Amount of Interest, Fees or Dividends Credited to Income 1,455 414  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 16,830 [2],[7],[27] 13,570  
Gross Additions 2,120 760  
Gross Reductions 0 0  
Ending balance 18,950 [5],[8],[28] 14,330  
Investment, Identifier [Axis]: Colonial Electric Company LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 2 2  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[8],[22] $ 0  
Investment, Identifier [Axis]: Colonial Electric Company LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.00% [8] 12.00% 9.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 88 (8)  
Amount of Interest, Fees or Dividends Credited to Income 206 428  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 8,779 [2],[7] 14,310  
Gross Additions 0 8  
Gross Reductions 0 323  
Ending balance 8,779 [5],[8] 13,995  
Investment, Identifier [Axis]: CompareNetworks Topco, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (3,750) (650)  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 7,650 [2],[7] 11,260  
Gross Additions 0 0  
Gross Reductions 3,750 650  
Ending balance $ 3,900 [5],[8] $ 10,610  
Investment, Identifier [Axis]: CompareNetworks Topco, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 14.79% [8],[23] 13.48% 12.98% [7]
Spread 11.00% [21],[23] 9.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (58) 0  
Amount of Interest, Fees or Dividends Credited to Income 150 107  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,031 [2],[7] 2,903  
Gross Additions 1 7  
Gross Reductions 96 210  
Ending balance 3,936 [5],[8],[23] 2,700  
Investment, Identifier [Axis]: Compass Systems & Sales, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 270 4  
Amount of Interest, Fees or Dividends Credited to Income 60 60  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 7,180 [2],[7] 7,450  
Gross Additions 270 4  
Gross Reductions 0 0  
Ending balance 7,450 [5],[8] 7,454  
Investment, Identifier [Axis]: Compass Systems & Sales, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 1 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (15) [2],[7],[25] (21)  
Gross Additions 1 2  
Gross Reductions 0 0  
Ending balance $ (14) [5],[8],[22] $ (19)  
Investment, Identifier [Axis]: Compass Systems & Sales, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.50% [8] 13.50% 13.50% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 591 589  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 16,961 [2],[7] 17,067  
Gross Additions 15 9  
Gross Reductions 1,000 0  
Ending balance $ 15,976 [5],[8] 17,076  
Investment, Identifier [Axis]: Computer Data Source, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 15.00% [19],[20]   12.28% [17],[18],[26],[31]
Spread [17],[18],[24],[26],[31]     8.25%
PIK Rate 15.00% [13],[19],[20]   12.02% [17],[18],[26],[31]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[31] $ 8,393    
Ending balance [5],[19],[20] $ 736    
Investment, Identifier [Axis]: Computer Data Source, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.06% [19],[20],[23],[30]   12.02% [17],[18],[26]
Spread 8.25% [19],[20],[21],[23],[30]   8.25% [17],[18],[24],[26]
PIK Rate 12.06% [13],[19],[20],[23],[30]   12.02% [17],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 20,352    
Ending balance [5],[19],[20],[23],[30] $ 7,767    
Investment, Identifier [Axis]: Computer Data Source, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 12.06%    
Spread [19],[20],[21],[23] 8.25%    
PIK Rate [13],[19],[20],[23] 12.06%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[23] $ 18,874    
Investment, Identifier [Axis]: Congruent Credit Opportunities Funds | LP Interests (Congruent Credit Opportunities Fund III, LP)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 812 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 24 [2],[11],[27],[40],[45],[46] 2,276  
Gross Additions 812 0  
Gross Reductions 0 0  
Ending balance 836 [5],[9],[28],[42],[47],[48] 2,276  
Investment, Identifier [Axis]: Connect Telecommunications Solutions Holdings, Inc. | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,596 [2],[11],[40],[41] 12,596  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 12,596 [5],[9],[42],[43] $ 12,596  
Investment, Identifier [Axis]: Connect Telecommunications Solutions Holdings, Inc. | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.00% [9],[42],[43] 13.00% 13.00% [11],[40],[41]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 786 910  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 24,153 [2],[11],[40],[41] 27,315  
Gross Additions 18 14  
Gross Reductions 900 0  
Ending balance 23,271 [5],[9],[42],[43] 27,329  
Investment, Identifier [Axis]: Copper Trail Fund Investments | LP Interests (CTMH, LP)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 140 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 390 [2],[7],[40],[45],[46] 500  
Gross Additions 140 15  
Gross Reductions 0 0  
Ending balance 530 [5],[8],[42],[47],[48] 515  
Investment, Identifier [Axis]: Core Transformers | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 627    
Ending balance [5],[19],[20] $ 1,030    
Investment, Identifier [Axis]: Core Transformers | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.50% [19],[20],[21],[22],[23]   5.50% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (59)    
Ending balance [5],[19],[20],[22],[23] $ (57)    
Investment, Identifier [Axis]: Core Transformers | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread 5.50% [19],[20],[21],[22],[23]   5.50% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (59)    
Ending balance [5],[19],[20],[22],[23] $ (57)    
Investment, Identifier [Axis]: Core Transformers | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.18% [19],[20],[23]   9.23% [17],[18],[26]
Spread 5.50% [19],[20],[21],[23]   5.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 6,151    
Ending balance [5],[19],[20],[23] $ 6,269    
Investment, Identifier [Axis]: CoreStack, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [19],[20] 10.00%    
PIK Rate [13],[19],[20] 10.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20] $ 1,378    
Investment, Identifier [Axis]: CoreStack, Inc. | Secured Debt 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20] $ 13,089    
Investment, Identifier [Axis]: Coregistics Buyer LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.17% [19],[20],[23],[42],[43]   10.32% [17],[18],[26],[40],[41]
Spread 6.50% [19],[20],[21],[23],[42],[43]   6.50% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 1,656    
Ending balance [5],[19],[20],[23],[42],[43] $ 1,650    
Investment, Identifier [Axis]: Coregistics Buyer LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.17% [19],[20],[23],[42],[43]   10.34% [17],[18],[26],[40],[41]
Spread 6.50% [19],[20],[21],[23],[42],[43]   6.50% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 10,484    
Ending balance [5],[19],[20],[23],[42],[43] $ 10,424    
Investment, Identifier [Axis]: Coregistics Buyer LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.42% [19],[20],[23],[42],[43]   10.59% [17],[18],[26],[40],[41]
Spread 6.75% [19],[20],[21],[23],[42],[43]   6.75% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 31,678    
Ending balance [5],[19],[20],[23],[42],[43] $ 30,982    
Investment, Identifier [Axis]: Coregistics Buyer LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 10.16% [19],[20],[23],[42],[43]   10.37% [17],[18],[26],[40],[41]
Spread 6.50% [19],[20],[21],[23],[42],[43]   6.50% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 6,989    
Ending balance [5],[19],[20],[23],[42],[43] 6,949    
Investment, Identifier [Axis]: Creative Foam Corporation | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 860    
Ending balance [5],[19],[20] $ 680    
Investment, Identifier [Axis]: Creative Foam Corporation | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 7.00% [19],[20],[21],[22],[23]   6.75% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (184)    
Ending balance [5],[19],[20],[22],[23] $ (171)    
Investment, Identifier [Axis]: Creative Foam Corporation | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.65% [19],[20],[23]   10.69% [17],[18],[26]
Spread 7.00% [19],[20],[21],[23]   6.75% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 5,531    
Ending balance [5],[19],[20],[23] $ 5,531    
Investment, Identifier [Axis]: Creative Foam Corporation | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.70% [19],[20],[23]   10.44% [17],[18],[26]
Spread 7.00% [19],[20],[21],[23]   6.75% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 88,683    
Ending balance [5],[19],[20],[23] 88,683    
Investment, Identifier [Axis]: Cybermedia Technologies, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 570    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] 6,340    
Gross Additions 570    
Gross Reductions 0    
Ending balance [5],[8] 6,910    
Investment, Identifier [Axis]: Cybermedia Technologies, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 4,050 (5,980)  
Amount of Interest, Fees or Dividends Credited to Income 63 63  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 15,000  
Gross Additions 4,050 0  
Gross Reductions 0 5,980  
Ending balance 4,050 [5],[8] 9,020  
Investment, Identifier [Axis]: Cybermedia Technologies, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 3 3  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[8],[22] $ 0  
Investment, Identifier [Axis]: Cybermedia Technologies, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [8] 13.00% 13.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 (509)  
Amount of Interest, Fees or Dividends Credited to Income 889 901  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 27,076 [2],[7] 27,116  
Gross Additions 16 15  
Gross Reductions 400 509  
Ending balance 26,692 [5],[8] 26,622  
Investment, Identifier [Axis]: DMA Industries, LLC | Preferred Equity 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 9,174 [2],[11] 5,944  
Gross Additions   0  
Gross Reductions   0  
Ending balance 13,674 [5],[9] $ 5,944  
Investment, Identifier [Axis]: DMA Industries, LLC | Preferred Equity 1.1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 4,500    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 9,174    
Gross Additions 4,500    
Gross Reductions 0    
Ending balance $ 13,674    
Investment, Identifier [Axis]: DMA Industries, LLC | Preferred Equity 1.2      
Schedule of Investments [Line Items]      
Total Rate 15.00%    
PIK Rate 15.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 2,321    
Amount of Interest, Fees or Dividends Credited to Income 139    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,424    
Gross Additions 2,459    
Gross Reductions 0    
Ending balance $ 7,883    
Investment, Identifier [Axis]: DMA Industries, LLC | Preferred Equity 2      
Schedule of Investments [Line Items]      
Total Rate 15.00% [9],[28] 15.00% 15.00% [11],[27]
PIK Rate 15.00% [9],[13],[28] 15.00% 15.00% [11],[14],[27]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   120  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 5,424 [2],[11],[27] 3,240  
Gross Additions   120  
Gross Reductions   0  
Ending balance $ 7,883 [5],[9],[28] $ 3,360  
Investment, Identifier [Axis]: DMA Industries, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.00% [9] 12.00% 10.00% [11]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   508  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 560 [2],[11] 16,722  
Gross Additions   4  
Gross Reductions   0  
Ending balance $ 560 [5],[9] $ 16,726  
Investment, Identifier [Axis]: DMA Industries, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 10.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (3)    
Amount of Interest, Fees or Dividends Credited to Income 323    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,800    
Gross Additions 3    
Gross Reductions 3    
Ending balance $ 12,800    
Investment, Identifier [Axis]: DMA Industries, LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Total Rate 10.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 14    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 560    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 560    
Investment, Identifier [Axis]: DMA Industries, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00% [9] 12.00% 10.00% [11]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   17  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 12,800 [2],[11] 555  
Gross Additions   0  
Gross Reductions   0  
Ending balance 12,800 [5],[9] 555  
Investment, Identifier [Axis]: DTE Enterprises, LLC | Class A Preferred Member Units      
Schedule of Investments [Line Items]      
Total Rate [17],[18]     8.00%
PIK Rate [14],[17],[18]     8.00%
Investment, Identifier [Axis]: DTE Enterprises, LLC | Class AA Preferred Member Units (non-voting)      
Schedule of Investments [Line Items]      
Total Rate [17],[18]     10.00%
PIK Rate [14],[17],[18]     10.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 0    
Investment, Identifier [Axis]: Dalton US Inc. | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 650    
Ending balance [5],[19],[20] 650    
Investment, Identifier [Axis]: Datacom, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 240  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[8] $ 240  
Investment, Identifier [Axis]: Datacom, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 7.50% [8],[44] 7.50% 7.50% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 13 17  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 675 [2],[7] 493  
Gross Additions 135 586  
Gross Reductions 135 135  
Ending balance $ 675 [5],[8],[44] $ 944  
Investment, Identifier [Axis]: Datacom, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00% [8],[44] 10.00% 10.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (1,015) 0  
Amount of Interest, Fees or Dividends Credited to Income 194 235  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,169 [2],[7] 7,947  
Gross Additions 0 35  
Gross Reductions 1,083 68  
Ending balance 3,086 [5],[8],[44] 7,914  
Investment, Identifier [Axis]: Digital Products Holdings LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 50 50  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 9,835 [2],[7],[27] 9,835  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 9,835 [5],[8],[28] $ 9,835  
Investment, Identifier [Axis]: Digital Products Holdings LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.69% [8],[23] 14.38% 13.88% [7],[26]
Spread 10.00% [8],[21],[23] 10.00% 10.00% [7],[24],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 420 453  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 11,338 [2],[7],[26] 12,422  
Gross Additions 10 12  
Gross Reductions 0 330  
Ending balance 11,348 [5],[8],[23] 12,104  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc. | Preferred Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 4,434 540  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 19,760 [2],[7] 17,930  
Gross Additions 9,234 540  
Gross Reductions 160 0  
Ending balance 28,834 [5],[8] 18,470  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [7]     14.00%
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (7)  
Amount of Interest, Fees or Dividends Credited to Income   11  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,785 [2],[7] 0  
Gross Additions   7  
Gross Reductions   7  
Ending balance 0 [5],[8],[22] $ 0  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc. | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 27    
Amount of Interest, Fees or Dividends Credited to Income 134    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,785    
Gross Additions 1,615    
Gross Reductions 3,400    
Ending balance 0    
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc. | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (3)    
Amount of Interest, Fees or Dividends Credited to Income 281    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 23,082    
Gross Additions 0    
Gross Reductions 23,082    
Ending balance $ 0    
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc. | Secured Debt 1.3      
Schedule of Investments [Line Items]      
Total Rate 14.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 338    
Amount of Interest, Fees or Dividends Credited to Income 1,696    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 43,857    
Gross Reductions 0    
Ending balance $ 43,857    
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.00% [8] 14.00% 14.00% [7]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (10)  
Amount of Interest, Fees or Dividends Credited to Income   837  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 23,082 [2],[7] 23,902  
Gross Additions   10  
Gross Reductions   420  
Ending balance 43,857 [5],[8] 23,492  
Investment, Identifier [Axis]: Doral Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 8,460    
Amount of Interest, Fees or Dividends Credited to Income 554    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] 15,740    
Gross Additions 8,460    
Gross Reductions 0    
Ending balance [5],[8],[28] $ 24,200    
Investment, Identifier [Axis]: Doral Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 184    
Amount of Interest, Fees or Dividends Credited to Income 939    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 26,270    
Gross Additions 230    
Gross Reductions 4,000    
Ending balance 22,500    
Investment, Identifier [Axis]: Doral Holdings, LLC | Secured Debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[25] 0    
Ending balance [5],[8],[22] $ 0    
Investment, Identifier [Axis]: Doral Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [8]   13.00% [7]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] $ 26,270    
Ending balance [5],[8] 22,500    
Investment, Identifier [Axis]: Dos Rios Partners | LP Interests (Dos Rios Partners - A, LP)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,549 [2],[11],[40],[45],[46] 2,447  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 2,549 [5],[9],[42],[47],[48] 2,447  
Investment, Identifier [Axis]: Dos Rios Partners | LP Interests (Dos Rios Partners, LP)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 8,027 [2],[11],[40],[45],[46] 7,708  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 8,027 [5],[9],[42],[47],[48] 7,708  
Investment, Identifier [Axis]: Dos Rios Stone Products LLC | Class A Preferred Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[11],[17],[36] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[9],[19],[37] 0  
Investment, Identifier [Axis]: Dreyfus Government Cash Management      
Schedule of Investments [Line Items]      
Total Rate 3.54%   3.70%
Investment, Identifier [Axis]: Dynamic Communities, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] $ 0    
Ending balance [5],[19],[20] 0    
Investment, Identifier [Axis]: Dynamic Communities, LLC | Preferred Equity 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 110    
Ending balance [5],[19],[20] 110    
Investment, Identifier [Axis]: Dynamic Communities, LLC | Preferred Equity 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 0    
Ending balance [5],[19],[20] $ 0    
Investment, Identifier [Axis]: Dynamic Communities, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.77% [19],[20],[23]   11.82% [17],[18],[26]
Spread 8.00% [19],[20],[21],[23]   8.00% [17],[18],[24],[26]
PIK Rate 11.77% [13],[19],[20],[23]   11.82% [14],[17],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 2,612    
Ending balance [5],[19],[20],[23] $ 2,689    
Investment, Identifier [Axis]: Dynamic Communities, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.77% [19],[20],[23]   12.82% [17],[18],[26]
Spread 9.00% [19],[20],[21],[23]   9.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 2,463    
Ending balance [5],[19],[20],[23] 2,463    
Investment, Identifier [Axis]: EIG Fund Investments | LP Interests (EIG Global Private Debt Fund-A, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 9  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 37 [2],[11],[27],[40],[46] 369  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 37 [5],[9],[28],[42],[48] 369  
Investment, Identifier [Axis]: EWMW LP | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 9.69% [20],[42],[48]   9.87% [18],[40],[46]
Spread 6.00% [20],[21],[42],[48]   6.00% [18],[24],[40],[46]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[40],[46] $ 3,144    
Ending balance [5],[20],[42],[48] 3,048    
Investment, Identifier [Axis]: Eastern Wholesale Fence LLC, Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26],[31]     9.75%
Spread [17],[18],[24],[26],[31]     5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[31] 3,946    
Investment, Identifier [Axis]: Eastern Wholesale Fence LLC, Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26]     9.84%
Spread [17],[18],[24],[26]     5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] 2,984    
Investment, Identifier [Axis]: Electro Technical Industries, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 2,220    
Ending balance [5],[19],[20] $ 3,240    
Investment, Identifier [Axis]: Electro Technical Industries, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.50% [19],[20],[21],[22],[23]   5.50% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (149)    
Ending balance [5],[19],[20],[22],[23] $ (140)    
Investment, Identifier [Axis]: Electro Technical Industries, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.18% [19],[20],[23]   9.22% [17],[18],[26]
Spread 5.50% [19],[20],[21],[23]   5.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 50,156    
Ending balance [5],[19],[20],[23] 49,837    
Investment, Identifier [Axis]: Elgin AcquireCo, LLC | Common Stock 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 140 (690)  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,050 [2],[7] 5,730  
Gross Additions 140 0  
Gross Reductions 0 690  
Ending balance 5,190 [5],[8] 5,040  
Investment, Identifier [Axis]: Elgin AcquireCo, LLC | Common Stock 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 60 50  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,270 [2],[7],[36] 3,050  
Gross Additions 60 50  
Gross Reductions 0 0  
Ending balance $ 3,330 [5],[8],[37] $ 3,100  
Investment, Identifier [Axis]: Elgin AcquireCo, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [8],[21],[22],[23] 6.00% 6.00% [7],[24],[25],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 2 2  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (3) [2],[7],[25],[26] (5)  
Gross Additions 1 0  
Gross Reductions 0 0  
Ending balance $ (2) [5],[8],[22],[23] $ (5)  
Investment, Identifier [Axis]: Elgin AcquireCo, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00% [8] 12.00% 12.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 510 551  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 16,719 [2],[7] 17,969  
Gross Additions 9 9  
Gross Reductions 117 70  
Ending balance $ 16,611 [5],[8] $ 17,908  
Investment, Identifier [Axis]: Elgin AcquireCo, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.00% [8] 9.00% 9.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 140 141  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,156 [2],[7] 6,207  
Gross Additions 1 1  
Gross Reductions 14 13  
Ending balance $ 6,143 [5],[8] $ 6,195  
Investment, Identifier [Axis]: Emerald Technologies Acquisition Co, Inc. | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.10% [12],[20],[23]   10.22% [10],[18],[26]
Spread 6.25% [12],[20],[21],[23]   6.25% [10],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18],[26] $ 5,878    
Ending balance [5],[12],[20],[23] 5,726    
Investment, Identifier [Axis]: EnCap Energy Fund Investments | LP Interests (EnCap Energy Capital Fund IX, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[27],[40],[45],[46] 1,056    
Investment, Identifier [Axis]: EnCap Energy Fund Investments | LP Interests (EnCap Energy Capital Fund VIII Co-Investors, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[27],[40],[45],[46] 5    
Investment, Identifier [Axis]: EnCap Energy Fund Investments | LP Interests (EnCap Energy Capital Fund VIII, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[27],[40],[45],[46] 130    
Investment, Identifier [Axis]: EnCap Energy Fund Investments | LP Interests (EnCap Energy Capital Fund X, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[27],[40],[45],[46] 4,674    
Investment, Identifier [Axis]: EnCap Energy Fund Investments | LP Interests (EnCap Energy Capital Fund XII, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[27],[40],[45],[46] 7,731    
Investment, Identifier [Axis]: EnCap Energy Fund Investments | LP Interests (EnCap Flatrock Midstream Fund II, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[27],[40],[45],[46] 15    
Investment, Identifier [Axis]: EnCap Energy Fund Investments | LP Interests (EnCap Flatrock Midstream Fund III, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[27],[40],[45],[46] 1,947    
Investment, Identifier [Axis]: EnCap Energy Fund Investments. | LP Interests (EnCap Energy Capital Fund IX, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[20],[28],[42],[47],[48] 871    
Investment, Identifier [Axis]: EnCap Energy Fund Investments. | LP Interests (EnCap Energy Capital Fund VIII Co-Investors, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[20],[28],[42],[47],[48] 5    
Investment, Identifier [Axis]: EnCap Energy Fund Investments. | LP Interests (EnCap Energy Capital Fund VIII, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[20],[28],[42],[47],[48] 77    
Investment, Identifier [Axis]: EnCap Energy Fund Investments. | LP Interests (EnCap Energy Capital Fund X, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[20],[28],[42],[47],[48] 4,202    
Investment, Identifier [Axis]: EnCap Energy Fund Investments. | LP Interests (EnCap Energy Capital Fund XII, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[20],[28],[42],[47],[48] 8,132    
Investment, Identifier [Axis]: EnCap Energy Fund Investments. | LP Interests (EnCap Flatrock Midstream Fund II, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[20],[28],[42],[47],[48] 15    
Investment, Identifier [Axis]: EnCap Energy Fund Investments. | LP Interests (EnCap Flatrock Midstream Fund III, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[20],[28],[42],[47],[48] 1,119    
Investment, Identifier [Axis]: Escalent, Inc. | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 910    
Ending balance [5],[19],[20] $ 910    
Investment, Identifier [Axis]: Escalent, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [19],[20],[21],[22],[23]   6.00% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ 0    
Ending balance [5],[19],[20],[22],[23] $ 0    
Investment, Identifier [Axis]: Escalent, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.70% [19],[20],[23]   9.67% [17],[18],[26]
Spread 6.00% [19],[20],[21],[23]   6.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 1,354    
Ending balance [5],[19],[20],[23] $ 1,344    
Investment, Identifier [Axis]: Escalent, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.70% [19],[20],[23]   9.67% [17],[18],[26]
Spread 6.00% [19],[20],[21],[23]   6.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 25,517    
Ending balance [5],[19],[20],[23] 25,319    
Investment, Identifier [Axis]: Event Holdco, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26]     10.93%
Spread [17],[18],[24],[26]     7.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] 3,692    
Investment, Identifier [Axis]: Event Holdco, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26]     10.93%
Spread [17],[18],[24],[26]     7.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 48,035    
Investment, Identifier [Axis]: Event Holdco, LLC. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 10.96%    
Spread [19],[20],[21],[23] 7.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[23] $ 3,692    
Investment, Identifier [Axis]: Event Holdco, LLC. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 10.96%    
Spread [19],[20],[21],[23] 7.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[23] $ 47,897    
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.00% 13.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (232) 3,438  
Amount of Interest, Fees or Dividends Credited to Income 1,231 1,305  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 31,160 29,109  
Gross Additions 232 3,691  
Gross Reductions 642 410  
Ending balance 30,750 32,390  
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC | Secured Debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[25] 0    
Ending balance [5],[9],[22] $ 0    
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [9]   13.00% [11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] $ 31,160    
Ending balance [5],[9] 30,750    
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC | Warrants      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (480) 3,790  
Amount of Interest, Fees or Dividends Credited to Income 180 390  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 15,140 [2],[11],[27],[34] 10,840  
Gross Additions 0 3,790  
Gross Reductions 480 0  
Ending balance 14,660 [5],[9],[28],[35] 14,630  
Investment, Identifier [Axis]: FRG AcquireCo, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 3,500    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[9] 3,500    
Investment, Identifier [Axis]: FRG AcquireCo, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 4    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[25] (19)    
Gross Additions 2    
Gross Reductions 0    
Ending balance [5],[9],[22] $ (17)    
Investment, Identifier [Axis]: FRG AcquireCo, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.50% [9]   13.00% [11]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 362    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 10,402    
Gross Additions 23    
Gross Reductions 2,018    
Ending balance [5],[9] $ 8,407    
Investment, Identifier [Axis]: Fidelity Treasury      
Schedule of Investments [Line Items]      
Total Rate 3.31%   3.43%
Investment, Identifier [Axis]: Flame King Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) $ 0 0  
Amount of Unrealized Gain/(Loss) 1,120 3,450  
Amount of Interest, Fees or Dividends Credited to Income 1,587 2,296  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 54,630 [2],[7],[27] 35,920  
Gross Additions 1,120 3,450  
Gross Reductions 0 0  
Ending balance $ 55,750 [5],[8],[28] 39,370  
Investment, Identifier [Axis]: Flame King Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [8] 12.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (32)    
Amount of Interest, Fees or Dividends Credited to Income 2,014    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 66,000    
Gross Additions 32    
Gross Reductions 32    
Ending balance [5],[8] 66,000    
Investment, Identifier [Axis]: Flame King Holdings, LLC | Secured Debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[25] 0    
Investment, Identifier [Axis]: Flame King Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [7]     12.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] 66,000    
Investment, Identifier [Axis]: Freeport Financial Funds | LP Interests (Freeport Financial SBIC Fund LP)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (54)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[40],[45],[46] 1,600    
Gross Additions 0    
Gross Reductions 54    
Ending balance [5],[9],[42],[47],[48] 1,546    
Investment, Identifier [Axis]: Freeport Financial Funds | LP Interests (Freeport First Lien Loan Fund III LP)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[40],[45],[46] 193    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[9],[42],[47],[48] 193    
Investment, Identifier [Axis]: Freeport Financial SBIC Fund LP | LP Interests (Freeport Financial SBIC Fund LP)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   2,190  
Gross Additions   0  
Gross Reductions   0  
Ending balance   2,190  
Investment, Identifier [Axis]: Freeport Financial SBIC Fund LP | LP Interests (Freeport First Lien Loan Fund III LP)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   1,263  
Gross Additions   0  
Gross Reductions   965  
Ending balance   298  
Investment, Identifier [Axis]: Fuse, LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18] 0    
Investment, Identifier [Axis]: Fuse, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [10],[18]     12.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18] 323    
Investment, Identifier [Axis]: Fuse, LLC. | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[12],[20] $ 0    
Investment, Identifier [Axis]: Fuse, LLC. | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [12],[20] 2.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[12],[20] $ 141    
Investment, Identifier [Axis]: GFG Group, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 (930)  
Amount of Interest, Fees or Dividends Credited to Income 140 437  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 10,940 [2],[11],[27] 10,540  
Gross Additions 0 0  
Gross Reductions 0 930  
Ending balance $ 10,940 [5],[9],[28] $ 9,610  
Investment, Identifier [Axis]: GFG Group, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 8.00% [9] 8.00% 8.00% [11]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (3) (4)  
Amount of Interest, Fees or Dividends Credited to Income 284 168  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 14,053 [2],[11] 8,185  
Gross Additions 3 4  
Gross Reductions 3 4  
Ending balance 14,053 [5],[9] 8,185  
Investment, Identifier [Axis]: GRT Rubber Technologies LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (2,350) 0  
Amount of Interest, Fees or Dividends Credited to Income 1,008 1,506  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 46,360 [2],[7],[27] 45,890  
Gross Additions 0 0  
Gross Reductions 2,350 0  
Ending balance $ 44,010 [5],[8],[28] $ 45,890  
Investment, Identifier [Axis]: GRT Rubber Technologies LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.79% [8] 10.48% 9.98% [7]
Spread 6.00% [8],[21] 6.00% 6.00% [7],[24]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (1) (1)  
Amount of Interest, Fees or Dividends Credited to Income 78 83  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,146 [2],[7] 3,146  
Gross Additions 1 1  
Gross Reductions 1 1  
Ending balance $ 3,146 [5],[8] $ 3,146  
Investment, Identifier [Axis]: GRT Rubber Technologies LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.79% [8] 12.48% 11.98% [7]
Spread 8.00% [8],[21] 8.00% 8.00% [7],[24]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (12) (12)  
Amount of Interest, Fees or Dividends Credited to Income 1,207 1,273  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 40,493 [2],[7] 40,493  
Gross Additions 12 12  
Gross Reductions 12 12  
Ending balance $ 40,493 [5],[8] 40,493  
Investment, Identifier [Axis]: GS HVAM Intermediate, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.27% [19],[20],[23],[30]   10.48% [17],[18],[26],[31]
Spread 6.50% [19],[20],[21],[23],[30]   6.50% [17],[18],[24],[26],[31]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[31] $ 6,061    
Ending balance [5],[19],[20],[23],[30] $ 6,061    
Investment, Identifier [Axis]: GS HVAM Intermediate, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.27% [19],[20],[23]   10.47% [17],[18],[26]
Spread 6.50% [19],[20],[21],[23]   6.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 10,392    
Ending balance [5],[19],[20],[23] $ 10,364    
Investment, Identifier [Axis]: GS HVAM Intermediate, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.27% [19],[20],[23]   10.47% [17],[18],[26]
Spread 6.50% [19],[20],[21],[23]   6.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 932    
Ending balance [5],[19],[20],[23] $ 930    
Investment, Identifier [Axis]: GS HVAM Intermediate, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 10.27% [19],[20],[23]   10.47% [17],[18],[26]
Spread 6.50% [19],[20],[21],[23]   6.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 223    
Ending balance [5],[19],[20],[23] $ 222    
Investment, Identifier [Axis]: GS HVAM Intermediate, LLC | Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate 10.27% [19],[20],[23]   10.47% [17],[18],[26]
Spread 6.50% [19],[20],[21],[23]   6.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 6,011    
Ending balance [5],[19],[20],[23] $ 5,996    
Investment, Identifier [Axis]: GULF PACIFIC ACQUISITION, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.77% [19],[20],[23],[30]   10.82% [17],[18],[26],[31]
Spread 7.00% [19],[20],[21],[23],[30]   7.00% [17],[18],[24],[26],[31]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[31] $ 420    
Ending balance [5],[19],[20],[23],[30] $ 330    
Investment, Identifier [Axis]: GULF PACIFIC ACQUISITION, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.78% [19],[20],[23]   10.83% [17],[18],[26]
Spread 7.00% [19],[20],[21],[23]   7.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 273    
Ending balance [5],[19],[20],[23] $ 275    
Investment, Identifier [Axis]: GULF PACIFIC ACQUISITION, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.77% [19],[20],[23]   10.82% [17],[18],[26]
Spread 7.00% [19],[20],[21],[23]   7.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 3,266    
Ending balance [5],[19],[20],[23] 3,301    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[36] 396    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   1,903  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 113,810 [2],[7],[27] 114,750  
Gross Additions   0  
Gross Reductions   0  
Ending balance   $ 114,750  
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 4,020    
Amount of Interest, Fees or Dividends Credited to Income 1,098    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 113,810    
Gross Additions 4,020    
Gross Reductions 0    
Ending balance [5],[8],[28] 117,830    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 396    
Gross Additions 0    
Gross Reductions 92    
Ending balance [5],[8],[37] $ 304    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [8],[23],[49] 11.19%    
Spread 7.50% [8],[21],[23],[49] 7.50% 7.50% [7],[24],[25],[26],[50]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 17 2  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25],[26],[50] 0  
Gross Additions 1,600 0  
Gross Reductions 0 0  
Ending balance $ 1,600 [5],[8],[23],[49] $ 0  
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.19% [8],[23],[49] 11.50% 11.38% [7],[26],[50]
Spread 7.50% [8],[21],[23],[49] 7.50% 7.50% [7],[24],[26],[50]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 12 (12)  
Amount of Interest, Fees or Dividends Credited to Income 2,176 2,114  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 70,526 [2],[7],[26],[50] 73,126  
Gross Additions 4,440 12  
Gross Reductions 0 12  
Ending balance 74,966 [5],[8],[23],[49] 73,126  
Investment, Identifier [Axis]: Garreco, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (110) (230)  
Amount of Interest, Fees or Dividends Credited to Income 0 19  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,830 [2],[7] 2,060  
Gross Additions 0 0  
Gross Reductions 110 230  
Ending balance 1,720 [5],[8] 1,830  
Investment, Identifier [Axis]: Garyline, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 450    
Investment, Identifier [Axis]: Garyline, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [17],[18],[24],[25],[26]     7.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] 0    
Investment, Identifier [Axis]: Garyline, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26]     10.98%
Spread [17],[18],[24],[26]     7.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 28,606    
Investment, Identifier [Axis]: Garyline, LLC. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23],[30] 10.92%    
Spread [19],[20],[21],[23],[30] 7.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[23],[30] $ 2,053    
Investment, Identifier [Axis]: Garyline, LLC. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 10.92%    
Spread [19],[20],[21],[23] 7.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[23] $ 28,424    
Investment, Identifier [Axis]: Garyline, LLC., Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20] 450    
Investment, Identifier [Axis]: GradeEight Corp. | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 1,229    
Ending balance [5],[19],[20] $ 1,030    
Investment, Identifier [Axis]: GradeEight Corp. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.18% [19],[20],[23],[30]   11.23% [17],[18],[26]
Spread 7.50% [19],[20],[21],[23],[30]   7.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 834    
Ending balance [5],[19],[20],[23],[30] $ 889    
Investment, Identifier [Axis]: GradeEight Corp. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.18% [19],[20],[23]   11.23% [17],[18],[26]
Spread 7.50% [19],[20],[21],[23]   7.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 4,090    
Ending balance [5],[19],[20],[23] $ 4,096    
Investment, Identifier [Axis]: GradeEight Corp. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 11.17% [19],[20],[23],[51]   11.31% [17],[18],[26],[52]
Spread 7.50% [19],[20],[21],[23],[51]   7.25% [17],[18],[24],[26],[52]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[52] $ 30,135    
Ending balance [5],[19],[20],[23],[51] 29,972    
Investment, Identifier [Axis]: Gulf Manufacturing, LLC | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 132  
Amount of Interest, Fees or Dividends Credited to Income 18 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,450 [2],[11],[27],[36],[40],[41] 888  
Gross Additions 0 132  
Gross Reductions 0 0  
Ending balance 1,450 [5],[9],[28],[37],[42],[43] 1,020  
Investment, Identifier [Axis]: Gulf Manufacturing, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (100) 0  
Amount of Interest, Fees or Dividends Credited to Income 142 178  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,600 [2],[11],[27],[40],[41] 14,730  
Gross Additions 0 0  
Gross Reductions 100 0  
Ending balance 6,500 [5],[9],[28],[42],[43] $ 14,730  
Investment, Identifier [Axis]: Gulf Manufacturing, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[40],[41] 5,190    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[9],[42],[43] $ 5,190    
Investment, Identifier [Axis]: Gulf Manufacturing, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [9],[42],[43] 11.82%    
Spread 8.13% [9],[21],[42],[43] 7.63% 8.13% [11],[24],[25],[40],[41]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 (2)  
Amount of Interest, Fees or Dividends Credited to Income 22 9  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (32) [2],[11],[25],[40],[41] 0  
Gross Additions 3,003 2  
Gross Reductions 0 2  
Ending balance $ 2,971 [5],[9],[42],[43] $ 0  
Investment, Identifier [Axis]: Gulf Manufacturing, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.82% [9],[42],[43] 12.00% 12.01% [11],[40],[41]
Spread 8.13% [9],[21],[42],[43] 7.63% 8.13% [11],[24],[40],[41]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 (23)  
Amount of Interest, Fees or Dividends Credited to Income 1,182 1,177  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 36,784 [2],[11],[40],[41] 39,000  
Gross Additions 83 23  
Gross Reductions 500 523  
Ending balance 36,367 [5],[9],[42],[43] 38,500  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   0  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   $ 0  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread   9.50%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   $ 0  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate   12.50%  
PIK Rate   12.50%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   298  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   1,518  
Gross Additions   220  
Gross Reductions   0  
Ending balance   1,738  
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 0    
Ending balance [5],[19],[20] $ 0    
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.01% [15],[19],[20],[23]   9.01% [16],[17],[18],[26]
Spread 3.50% [15],[20],[23]   3.50% [16],[17],[18],[24],[26]
PIK Rate 2.50% [13],[15],[19],[20],[23]   2.50% [14],[16],[17],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[16],[17],[18],[26] $ 2,272    
Ending balance [5],[15],[19],[20],[23] $ 1,964    
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 2.50% [15],[19],[20]   2.50% [16],[17],[18]
PIK Rate 2.50% [13],[15],[19],[20]   2.50% [14],[16],[17],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[16],[17],[18] $ 0    
Ending balance [5],[15],[19],[20] $ 0    
Investment, Identifier [Axis]: HOWLCO LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.33% [12],[20],[23],[42],[43]   10.51% [10],[18],[26],[40],[41]
Spread 6.50% [12],[20],[21],[23],[42],[43]   6.50% [10],[18],[24],[26],[40],[41]
PIK Rate 3.50% [12],[13],[20],[23],[42],[43]   3.50% [10],[14],[18],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18],[26],[40],[41] $ 26,616    
Ending balance [5],[12],[20],[23],[42],[43] 26,578    
Investment, Identifier [Axis]: HPEP 3, L.P. | LP Interests (HPEP 3, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   194  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   4,472  
Gross Additions   194  
Gross Reductions   204  
Ending balance   4,462  
Investment, Identifier [Axis]: HPEP 3, L.P. | LP Interests (HPEP 4, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   113  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   5,861  
Gross Additions   113  
Gross Reductions   0  
Ending balance   5,974  
Investment, Identifier [Axis]: HPEP 423 COR, LP | LP Interests (423 COR, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   83  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   4,187  
Gross Additions   83  
Gross Reductions   0  
Ending balance   4,270  
Investment, Identifier [Axis]: Harris Preston Fund Investments | LP Interests (2717 GRE-LP, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 75    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[40],[45],[46] 441    
Gross Additions 75    
Gross Reductions 0    
Ending balance [5],[8],[42],[47],[48] 516    
Investment, Identifier [Axis]: Harris Preston Fund Investments | LP Interests (2717 HPP-MS, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (190)    
Amount of Interest, Fees or Dividends Credited to Income 282    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[40],[45],[46] 447    
Gross Additions 0    
Gross Reductions 190    
Ending balance [5],[8],[28],[42],[47],[48] 257    
Investment, Identifier [Axis]: Harris Preston Fund Investments | LP Interests (2717 MH, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 70    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[40],[45],[46] 1,795    
Gross Additions 70    
Gross Reductions 0    
Ending balance [5],[8],[42],[47],[48] 1,865    
Investment, Identifier [Axis]: Harris Preston Fund Investments | LP Interests (423 AER II, LP)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[40],[45],[46] 1,590    
Ending balance [5],[20],[42],[47],[48] 1,831    
Investment, Identifier [Axis]: Harris Preston Fund Investments | LP Interests (423 COR, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 95    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[40],[45],[46] 5,244    
Gross Additions 95    
Gross Reductions 0    
Ending balance [5],[8],[42],[47],[48] 5,339    
Investment, Identifier [Axis]: Harris Preston Fund Investments | LP Interests (423 HAR, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[27],[40],[45],[46] 1,226    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[9],[28],[42],[47],[48] 1,226    
Investment, Identifier [Axis]: Harris Preston Fund Investments | LP Interests (HPEP 3, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (128)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[40],[45],[46] 4,116    
Gross Additions 0    
Gross Reductions 380    
Ending balance [5],[9],[42],[47],[48] 3,736    
Investment, Identifier [Axis]: Harris Preston Fund Investments | LP Interests (HPEP 4, L.P.)      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 787    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[40],[45],[46] 7,463    
Gross Additions 2,072    
Gross Reductions 0    
Ending balance [5],[9],[42],[47],[48] 9,535    
Investment, Identifier [Axis]: Harrison Hydra-Gen, Ltd. | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 50  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 7,080 [2],[7],[27] 7,010  
Gross Additions 0 50  
Gross Reductions 0 0  
Ending balance 7,080 [5],[8],[28] 7,060  
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Preferred Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   860  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 26,310 [2],[11],[27] 20,260  
Gross Additions   860  
Gross Reductions   0  
Ending balance 26,310 [5],[9],[28] 21,120  
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Preferred Member Units 1.1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 26,310    
Gross Additions 0    
Gross Reductions 0    
Ending balance 26,310    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Preferred Member Units 1.2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,380    
Gross Additions 0    
Gross Reductions 0    
Ending balance 1,380    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Preferred Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   40  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,380 [2],[11],[36] 1,070  
Gross Additions   40  
Gross Reductions   0  
Ending balance $ 1,380 [5],[9],[37] $ 1,110  
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate   10.48% 9.98% [11],[26]
Spread 6.00% [9],[21],[22],[23] 6.00% 6.00% [11],[24],[26]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   83  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 3,219 [2],[11],[26] 2,645  
Gross Additions   1,497  
Gross Reductions   1,640  
Ending balance 0 [5],[9],[22],[23] $ 2,502  
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,219    
Gross Additions 0    
Gross Reductions 3,219    
Ending balance $ 0    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Spread 6.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 23    
Amount of Interest, Fees or Dividends Credited to Income 7    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 0    
Ending balance 0    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 1.3      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 45,256    
Gross Additions 0    
Gross Reductions 45,256    
Ending balance $ 0    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 1.4      
Schedule of Investments [Line Items]      
Total Rate 11.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 271    
Amount of Interest, Fees or Dividends Credited to Income 1,772    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 49,871    
Gross Reductions 0    
Ending balance 49,871    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate   12.50% 11.00% [11]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (14)  
Amount of Interest, Fees or Dividends Credited to Income   1,428  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 45,256 [2],[11] 45,256  
Gross Additions   14  
Gross Reductions   14  
Ending balance 0 [5],[9],[22] 45,256  
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[9],[22] $ 0    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [9] 11.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[9] $ 49,871    
Investment, Identifier [Axis]: Hornblower Sub, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.18% [19],[20],[23],[30]   9.32% [17],[18],[26],[31]
Spread 5.50% [19],[20],[21],[23],[30]   5.50% [17],[18],[24],[26],[31]
PIK Rate 1.50% [13],[19],[20],[23],[30]   1.50% [14],[17],[18],[26],[31]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[31] $ 4,697    
Ending balance [5],[19],[20],[23],[30] $ 4,839    
Investment, Identifier [Axis]: Hornblower Sub, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.15% [19],[20],[23]   9.46% [17],[18],[26]
Spread 5.50% [19],[20],[21],[23]   5.50% [17],[18],[24],[26]
PIK Rate 1.50% [13],[19],[20],[23]   1.50% [14],[17],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 32,163    
Ending balance [5],[19],[20],[23] 32,509    
Investment, Identifier [Axis]: Houston Plating and Coatings, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (210) 310  
Amount of Interest, Fees or Dividends Credited to Income 49 49  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,720 [2],[11],[27] 3,930  
Gross Additions 0 310  
Gross Reductions 210 0  
Ending balance $ 3,510 [5],[9],[28] $ 4,240  
Investment, Identifier [Axis]: Houston Plating and Coatings, LLC | Unsecured Convertible Debt      
Schedule of Investments [Line Items]      
Total Rate 10.00% [9] 10.00% 10.00% [11]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 75 75  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,000 [2],[11] 2,940  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 3,000 [5],[9] 2,940  
Investment, Identifier [Axis]: Hybrid Promotions, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 11.91% [19],[20],[23]   12.24% [17],[18],[26]
Spread 8.25% [19],[20],[21],[23]   8.25% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 7,200    
Ending balance [5],[19],[20],[23] 7,200    
Investment, Identifier [Axis]: IG Investor, LLC | Common Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 730 1,550  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 28,030 [2],[7] 16,230  
Gross Additions 730 1,550  
Gross Reductions 0 0  
Ending balance $ 28,760 [5],[8] $ 17,780  
Investment, Identifier [Axis]: IG Investor, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 13.00% [8] 13.00% 13.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (2) 26  
Amount of Interest, Fees or Dividends Credited to Income 51 57  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,600 [2],[7] 1,572  
Gross Additions 2 28  
Gross Reductions 802 0  
Ending balance $ 800 [5],[8] $ 1,600  
Investment, Identifier [Axis]: IG Investor, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [8] 13.00% 13.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (21) 227  
Amount of Interest, Fees or Dividends Credited to Income 1,140 1,160  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 35,064 [2],[7] 35,257  
Gross Additions 21 247  
Gross Reductions 821 440  
Ending balance $ 34,264 [5],[8] $ 35,064  
Investment, Identifier [Axis]: IG Parent Corporation | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.75% [12],[20],[21],[22],[23]   5.75% [10],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18],[25],[26] $ 0    
Ending balance [5],[12],[20],[22],[23] $ 0    
Investment, Identifier [Axis]: IG Parent Corporation | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.52% [12],[20],[23]   9.57% [10],[18],[26]
Spread 5.75% [12],[20],[21],[23]   5.75% [10],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18],[26] $ 10,127    
Ending balance [5],[12],[20],[23] $ 10,101    
Investment, Identifier [Axis]: IG Parent Corporation | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.52% [12],[20],[23]   9.57% [10],[18],[26]
Spread 5.75% [12],[20],[21],[23]   5.75% [10],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18],[26] $ 4,853    
Ending balance [5],[12],[20],[23] $ 4,840    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.84% [9],[23] 12.96% 11.15% [11],[26]
Spread 7.00% [9],[21],[23] 8.50% 7.00% [11],[24],[26]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (1)  
Amount of Interest, Fees or Dividends Credited to Income   40  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 1,180 [2],[11],[26] 1,180  
Gross Additions   1  
Gross Reductions   1  
Ending balance $ 1,180 [5],[9],[23] $ 1,180  
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 10.84%    
Spread 7.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (1)    
Amount of Interest, Fees or Dividends Credited to Income 33    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,180    
Gross Additions 1    
Gross Reductions 1    
Ending balance $ 1,180    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Total Rate 10.84%    
Spread 7.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (2)    
Amount of Interest, Fees or Dividends Credited to Income 146    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,310    
Gross Additions 2    
Gross Reductions 2    
Ending balance $ 5,310    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 1.3      
Schedule of Investments [Line Items]      
Total Rate 10.84%    
Spread 7.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (67)    
Amount of Interest, Fees or Dividends Credited to Income 200    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,935    
Gross Additions 67    
Gross Reductions 67    
Ending balance $ 4,935    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 1.4      
Schedule of Investments [Line Items]      
Total Rate 10.84%    
Spread 7.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (67)    
Amount of Interest, Fees or Dividends Credited to Income 200    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,935    
Gross Additions 67    
Gross Reductions 67    
Ending balance $ 4,935    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 1.5      
Schedule of Investments [Line Items]      
Total Rate 10.84%    
Spread 7.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (1)    
Amount of Interest, Fees or Dividends Credited to Income 49    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,770    
Gross Additions 1    
Gross Reductions 1    
Ending balance $ 1,770    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 1.6      
Schedule of Investments [Line Items]      
Total Rate 10.84%    
Spread 7.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 2,360    
Gross Reductions 0    
Ending balance $ 2,360    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.84% [9],[23] 12.96% 11.15% [11],[26]
Spread 7.00% [9],[21],[23] 8.50% 7.00% [11],[24],[26]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (1)  
Amount of Interest, Fees or Dividends Credited to Income   34  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 5,310 [2],[11],[26] 994  
Gross Additions   1  
Gross Reductions   1  
Ending balance $ 5,310 [5],[9],[23] $ 994  
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate   11.96% 11.15% [11],[26]
Spread 7.00% [9],[21],[22],[23] 7.50% 7.00% [11],[24],[26]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (67)  
Amount of Interest, Fees or Dividends Credited to Income   201  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 4,935 [2],[11],[26] 4,438  
Gross Additions   67  
Gross Reductions   67  
Ending balance $ 0 [5],[9],[22],[23] $ 4,438  
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 10.84% [9],[23] 13.96% 11.15% [11],[26]
Spread 7.00% [9],[21],[23] 9.50% 7.00% [11],[24],[26]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (67)  
Amount of Interest, Fees or Dividends Credited to Income   223  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 4,935 [2],[11],[26] 4,438  
Gross Additions   67  
Gross Reductions   67  
Ending balance $ 4,935 [5],[9],[23] 4,438  
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate 10.84% [9],[23]   11.15% [11],[26]
Spread 7.00% [9],[21],[23]   7.00% [11],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[26] $ 1,770    
Ending balance [5],[9],[23] $ 4,935    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 6      
Schedule of Investments [Line Items]      
Total Rate [9],[23] 10.84%    
Spread [9],[21],[23] 7.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[9],[23] $ 1,770    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 7      
Schedule of Investments [Line Items]      
Total Rate [9],[23] 10.84%    
Spread [9],[21],[23] 7.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[9],[23] $ 2,360    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Warrants      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 970  
Amount of Interest, Fees or Dividends Credited to Income 1,125 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 15,230 [2],[11],[27],[34] 5,690  
Gross Additions 0 970  
Gross Reductions 0 0  
Ending balance $ 15,230 [5],[9],[28],[35] 6,660  
Investment, Identifier [Axis]: Ignite Visibility LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 8.41% [19],[20],[23]   8.84% [17],[18],[26]
Spread 4.75% [19],[20],[21],[23]   5.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 4,689    
Ending balance [5],[19],[20],[23] $ 4,695    
Investment, Identifier [Axis]: Ignite Visibility LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.41% [19],[20],[23]   10.84% [17],[18],[26]
Spread 6.75% [19],[20],[21],[23]   7.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 4,689    
Ending balance [5],[19],[20],[23] 4,695    
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C. | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 1,090    
Ending balance [5],[19],[20],[28] 1,090    
Investment, Identifier [Axis]: Implus Footcare, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 4,910    
Ending balance [5],[19],[20] $ 3,740    
Investment, Identifier [Axis]: Implus Footcare, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.70% [19],[20],[23]   9.68% [17],[18],[26]
Spread 6.00% [19],[20],[21],[23]   6.00% [17],[18],[24],[26]
PIK Rate 4.00% [13],[19],[20],[23]   4.00% [14],[17],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 1,944    
Ending balance [5],[19],[20],[23] $ 1,963    
Investment, Identifier [Axis]: Implus Footcare, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.70% [19],[20],[23]   9.68% [17],[18],[26]
Spread 6.00% [19],[20],[21],[23]   6.00% [17],[18],[24],[26]
PIK Rate 9.70% [13],[19],[20],[23]   9.68% [14],[17],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 4,425    
Ending balance [5],[19],[20],[23] 4,532    
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC | Common Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 (540)  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 19,000 [2],[11],[17] 20,390  
Gross Additions 0 0  
Gross Reductions 0 540  
Ending balance 19,000 [5],[9],[19] 19,850  
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 330 (1,150)  
Amount of Interest, Fees or Dividends Credited to Income 180 838  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 8,010 [2],[11],[27] 9,080  
Gross Additions 330 0  
Gross Reductions 0 1,150  
Ending balance 8,340 [5],[9],[28] $ 7,930  
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   12.00% 12.00% [11]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (9)  
Amount of Interest, Fees or Dividends Credited to Income   453  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 15,299 [2],[11] 15,050  
Gross Additions   9  
Gross Reductions   234  
Ending balance   14,825  
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC | Secured Debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[9],[22] $ 0    
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 12.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (1)    
Amount of Interest, Fees or Dividends Credited to Income 454    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 15,299    
Gross Additions 1    
Gross Reductions 226    
Ending balance 15,074    
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 44    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 4,000    
Gross Reductions 4,000    
Ending balance $ 0    
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [9] 12.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[9] $ 15,074    
Investment, Identifier [Axis]: Insight Borrower Corporation | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 270    
Ending balance [5],[19],[20] $ 110    
Investment, Identifier [Axis]: Insight Borrower Corporation | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26]     10.10%
Spread 6.25% [19],[20],[21],[22],[23]   6.25% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 1,341    
Ending balance [5],[19],[20],[22],[23] $ (35)    
Investment, Identifier [Axis]: Insight Borrower Corporation | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.92% [19],[20],[23]   10.12% [17],[18],[26]
Spread 6.25% [19],[20],[21],[23]   6.25% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 13,140    
Ending balance [5],[19],[20],[23] 12,838    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 97    
Ending balance [5],[19],[20] $ 97    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 13.27% [19],[20],[23]   13.97% [17],[18],[26]
Spread 9.50% [19],[20],[21],[23]   10.00% [17],[18],[24],[26]
PIK Rate 1.50% [13],[19],[20],[23]   2.00% [14],[17],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 808    
Ending balance [5],[19],[20],[23] $ 813    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.27% [19],[20],[23]   13.97% [17],[18],[26]
Spread 9.50% [19],[20],[21],[23]   10.00% [17],[18],[24],[26]
PIK Rate 1.50% [13],[19],[20],[23]   2.00% [14],[17],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 6,889    
Ending balance [5],[19],[20],[23] $ 6,915    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 13.27% [19],[20],[23]   13.97% [17],[18],[26]
Spread 9.50% [19],[20],[21],[23]   10.00% [17],[18],[24],[26]
PIK Rate 1.50% [13],[19],[20],[23]   2.00% [14],[17],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 2,773    
Ending balance [5],[19],[20],[23] $ 2,781    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 13.27% [19],[20],[23]   13.97% [17],[18],[26]
Spread 9.50% [19],[20],[21],[23]   10.00% [17],[18],[24],[26]
PIK Rate 1.50% [13],[19],[20],[23]   2.00% [14],[17],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 320    
Ending balance [5],[19],[20],[23] 321    
Investment, Identifier [Axis]: Integral Energy Services | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (70) 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 350 [2],[11],[17] 550  
Gross Additions 0 0  
Gross Reductions 70 0  
Ending balance $ 280 [5],[9],[19] $ 550  
Investment, Identifier [Axis]: Integral Energy Services | Preferred Equity      
Schedule of Investments [Line Items]      
Total Rate   10.00%  
PIK Rate   10.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   6  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   452  
Gross Additions   6  
Gross Reductions   0  
Ending balance   $ 458  
Investment, Identifier [Axis]: Integral Energy Services | Preferred Equity 1      
Schedule of Investments [Line Items]      
Total Rate 10.00% [9],[19],[28]   10.00% [11],[17],[27]
PIK Rate 10.00% [9],[13],[19],[28]   10.00% [11],[14],[17],[27]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 7    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[17],[27] 420    
Gross Additions 7    
Gross Reductions 0    
Ending balance [5],[9],[19],[28] $ 427    
Investment, Identifier [Axis]: Integral Energy Services | Preferred Equity 2      
Schedule of Investments [Line Items]      
Total Rate 10.00% [9],[19]   10.00% [11],[17]
PIK Rate 10.00% [9],[13],[19]   10.00% [11],[14],[17]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[17] 404    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[9],[19] $ 404    
Investment, Identifier [Axis]: Integral Energy Services | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 11.42% [9],[19],[23] 12.07% 11.75% [11],[17],[26]
Spread 7.50% [9],[19],[21],[23] 7.50% 7.50% [11],[17],[24],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (269) 0  
Amount of Interest, Fees or Dividends Credited to Income 363 403  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,042 [2],[11],[17],[26] 12,728  
Gross Additions 13 13  
Gross Reductions 269 0  
Ending balance 11,786 [5],[9],[19],[23] 12,741  
Investment, Identifier [Axis]: Interface Security Systems, L.L.C | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 0    
Ending balance [5],[19],[20] $ 0    
Investment, Identifier [Axis]: Interface Security Systems, L.L.C | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 13.77% [19],[20],[30],[44]   13.92% [17],[18],[29],[31]
Spread 10.00% [19],[20],[21],[30],[44]   10.00% [17],[18],[24],[29],[31]
PIK Rate 13.77% [13],[19],[20],[30],[44]   13.92% [14],[17],[18],[29],[31]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[29],[31] $ 2,077    
Ending balance [5],[19],[20],[30],[44] $ 2,160    
Investment, Identifier [Axis]: Interface Security Systems, L.L.C | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.02% [15],[19],[20],[23],[44]   11.02% [16],[17],[18],[26],[29]
Spread 7.00% [15],[19],[20],[21],[23],[44]   7.00% [16],[17],[18],[24],[26],[29]
PIK Rate 11.02% [13],[15],[19],[20],[23],[44]   11.02% [14],[16],[17],[18],[26],[29]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[16],[17],[18],[26],[29] $ 1    
Ending balance [5],[15],[19],[20],[23],[44] $ 5    
Investment, Identifier [Axis]: Invincible Boat Company, LLC. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.32% [19],[20],[23]   11.37% [17],[18],[26]
Spread 7.50% [19],[20],[21],[23]   7.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 1,319    
Ending balance [5],[19],[20],[23] $ 1,226    
Investment, Identifier [Axis]: Invincible Boat Company, LLC. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.32% [19],[20],[23],[51]   11.37% [17],[18],[26],[52]
Spread 8.00% [19],[20],[21],[23],[51]   7.50% [17],[18],[24],[26],[52]
PIK Rate 3.32% [13],[19],[20],[23],[51]   3.37% [14],[17],[18],[26],[52]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[52] $ 15,247    
Ending balance [5],[19],[20],[23],[51] 13,288    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 150 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,700 [2],[11] 2,850  
Gross Additions 150 0  
Gross Reductions 0 0  
Ending balance $ 2,850 [5],[9] $ 2,850  
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Total Rate   25.00%  
PIK Rate   25.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   760  
Gross Additions   0  
Gross Reductions   0  
Ending balance   $ 760  
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Preferred Equity 1      
Schedule of Investments [Line Items]      
Total Rate 25.00% [9]   25.00% [11]
PIK Rate 25.00% [9],[13]   25.00% [11],[14]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 70    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 1,030    
Gross Additions 70    
Gross Reductions 0    
Ending balance [5],[9] $ 1,100    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Preferred Equity 2      
Schedule of Investments [Line Items]      
Total Rate 25.00% [9]   25.00% [11]
PIK Rate 25.00% [9],[13]   25.00% [11],[14]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 155    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[9] $ 155    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 13.00% [9] 13.00% 13.00% [11]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 148 148  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,500 [2],[11] 4,493  
Gross Additions 2 2  
Gross Reductions 0 0  
Ending balance $ 4,502 [5],[9] $ 4,495  
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [9] 13.00% 13.00% [11]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 97 97  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,931 [2],[11] 2,927  
Gross Additions 1 1  
Gross Reductions 0 0  
Ending balance $ 2,932 [5],[9] $ 2,928  
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 13.00% [9] 13.00% 13.00% [11]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 291 291  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 8,944 [2],[11] 8,944  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 8,944 [5],[9] $ 8,944  
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 13.00% [9] 13.00% 13.00% [11]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 577 579  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 17,569 [2],[11] 17,542  
Gross Additions 7 7  
Gross Reductions 207 0  
Ending balance $ 17,369 [5],[9] $ 17,549  
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate 13.00% [9] 13.00% 13.00% [11]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 323 337  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 9,421 [2],[11] 9,638  
Gross Additions 20 22  
Gross Reductions 353 288  
Ending balance 9,088 [5],[9] 9,372  
Investment, Identifier [Axis]: Isagenix International, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18] 0    
Ending balance [5],[12],[20] $ 0    
Investment, Identifier [Axis]: Isagenix International, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 11.27% [12],[15],[20],[23]   2.50% [10],[18],[26],[53]
Spread [12],[15],[20],[21],[23] 7.50%    
PIK Rate [12],[13],[15],[20],[23] 8.77%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18],[26],[53] $ 458    
Ending balance [5],[12],[15],[20],[23] $ 457    
Investment, Identifier [Axis]: Island Pump and Tank, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.92% [19],[20],[23]   11.25% [17],[18],[26]
Spread 7.00% [19],[20],[21],[23]   7.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 443    
Ending balance [5],[19],[20],[23] $ 386    
Investment, Identifier [Axis]: Island Pump and Tank, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.92% [19],[20],[23]   10.25% [17],[18],[26]
Spread 6.00% [19],[20],[21],[23]   6.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 2,048    
Ending balance [5],[19],[20],[23] $ 1,785    
Investment, Identifier [Axis]: Island Pump and Tank, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.92% [19],[20],[23]   11.25% [17],[18],[26]
Spread 7.00% [19],[20],[21],[23]   7.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 2,048    
Ending balance [5],[19],[20],[23] $ 1,785    
Investment, Identifier [Axis]: Island Pump and Tank, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 11.92% [19],[20],[23]   12.25% [17],[18],[26]
Spread 8.00% [19],[20],[21],[23]   8.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 2,048    
Ending balance [5],[19],[20],[23] 1,785    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Common Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 0    
Ending balance 0    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Common Equity 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[17] 0    
Ending balance [5],[8],[19] 0    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Common Equity 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[17] 0    
Ending balance [5],[8],[19] $ 0    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 8.92% [8],[15],[19],[23]   9.13% [7],[17],[26]
Spread 5.00% [8],[15],[19],[21],[23]   5.00% [7],[17],[24],[26]
PIK Rate [8],[13],[15],[19],[23] 8.92%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[17],[26] $ 6,316    
Ending balance [5],[8],[15],[19],[23] $ 6,529    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 9.92%    
Spread 6.00%    
PIK Rate 9.92%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (27,772)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 36,429    
Gross Additions 0    
Gross Reductions 27,772    
Ending balance $ 8,657    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Total Rate 15.00%    
PIK Rate 15.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (939)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 939    
Gross Additions 0    
Gross Reductions 939    
Ending balance $ 0    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Secured Debt 1.3      
Schedule of Investments [Line Items]      
Total Rate 8.92%    
Spread 5.00%    
PIK Rate 8.92%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,316    
Gross Additions 213    
Gross Reductions 0    
Ending balance $ 6,529    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.92% [8],[15],[19],[23]   10.13% [7],[17],[26]
Spread 6.00% [8],[15],[19],[21],[23]   6.00% [7],[17],[24],[26]
PIK Rate 9.92% [8],[13],[15],[19],[23]   10.13% [7],[14],[17],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[17],[26] $ 36,429    
Ending balance [5],[8],[15],[19],[23] $ 8,657    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 15.00% [8],[15],[19]   15.00% [7],[16],[17]
PIK Rate 15.00% [8],[13],[15],[19]   15.00% [7],[14],[16],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[16],[17] $ 939    
Ending balance [5],[8],[15],[19] 0    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 750    
Ending balance [5],[19],[20] $ 650    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.31% [19],[20],[23],[51]   11.01% [17],[18],[26],[52]
Spread 7.50% [19],[20],[21],[23],[51]   7.00% [17],[18],[24],[26],[52]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[52] $ 751    
Ending balance [5],[19],[20],[23],[51] $ 740    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.29% [19],[20],[23],[51]   11.23% [17],[18],[26],[52]
Spread 7.50% [19],[20],[21],[23],[51]   7.00% [17],[18],[24],[26],[52]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[52] $ 625    
Ending balance [5],[19],[20],[23],[51] $ 625    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 11.18% [19],[20],[23],[51]   11.11% [17],[18],[26],[52]
Spread 7.50% [19],[20],[21],[23],[51]   7.00% [17],[18],[24],[26],[52]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[52] $ 667    
Ending balance [5],[19],[20],[23],[51] $ 667    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 11.31% [19],[20],[23]   10.84% [17],[18],[26]
Spread 7.50% [19],[20],[21],[23]   7.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 1,738    
Ending balance [5],[19],[20],[23] 1,712    
Investment, Identifier [Axis]: Jensen Jewelers of Idaho, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 620 (280)  
Amount of Interest, Fees or Dividends Credited to Income 301 260  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 11,540 [2],[7],[27] 11,820  
Gross Additions 620 0  
Gross Reductions 0 280  
Ending balance $ 12,160 [5],[8],[28] $ 11,540  
Investment, Identifier [Axis]: Jensen Jewelers of Idaho, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.75% [8],[21],[22],[23] 6.75% 6.75% [7],[24],[25],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25],[26] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[8],[22],[23] $ 0  
Investment, Identifier [Axis]: Jensen Jewelers of Idaho, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.50% [8],[23] 14.25% 13.75% [7],[26]
Spread 6.75% [8],[21],[23] 6.75% 6.75% [7],[24],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 30 53  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 878 [2],[7],[26] 1,498  
Gross Additions 0 0  
Gross Reductions 150 160  
Ending balance 728 [5],[8],[23] 1,338  
Investment, Identifier [Axis]: Joerns Healthcare, LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18] 350    
Ending balance [5],[12],[20] $ 280    
Investment, Identifier [Axis]: Joerns Healthcare, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.77% [12],[20],[23]   11.94% [10],[18],[26]
Spread 8.00% [12],[20],[21],[23]   8.00% [10],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18],[26] $ 1,833    
Ending balance [5],[12],[20],[23] $ 1,833    
Investment, Identifier [Axis]: Joerns Healthcare, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.77% [12],[20],[23]   11.94% [10],[18],[26]
Spread 8.00% [12],[20],[21],[23]   8.00% [10],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18],[26] $ 1,369    
Ending balance [5],[12],[20],[23] 1,369    
Investment, Identifier [Axis]: Johnson Downie Opco, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   1,480  
Amount of Interest, Fees or Dividends Credited to Income   384  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   14,550  
Gross Additions   1,480  
Gross Reductions   0  
Ending balance   16,030  
Investment, Identifier [Axis]: Johnson Downie Opco, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (2)  
Amount of Interest, Fees or Dividends Credited to Income   6  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   2  
Gross Reductions   2  
Ending balance   $ 0  
Investment, Identifier [Axis]: Johnson Downie Opco, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate   15.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (12)  
Amount of Interest, Fees or Dividends Credited to Income   818  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   21,507  
Gross Additions   12  
Gross Reductions   12  
Ending balance   21,507  
Investment, Identifier [Axis]: JorVet Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 3 490  
Amount of Interest, Fees or Dividends Credited to Income 106 285  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 10,990 [2],[7],[27] 13,180  
Gross Additions 3 490  
Gross Reductions 0 0  
Ending balance $ 10,993 [5],[8],[28] $ 13,670  
Investment, Identifier [Axis]: JorVet Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.00% [8] 12.00% 12.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 711 711  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 23,263 [2],[7] 23,216  
Gross Additions 12 12  
Gross Reductions 0 0  
Ending balance 23,275 [5],[8] 23,228  
Investment, Identifier [Axis]: KBK Industries, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 17,327 0  
Amount of Unrealized Gain/(Loss) (17,396) 0  
Amount of Interest, Fees or Dividends Credited to Income 1,603 707  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 18,180 [2],[7],[27] 25,180  
Gross Additions 17,326 0  
Gross Reductions 35,506 0  
Ending balance 0 $ 25,180  
Investment, Identifier [Axis]: KBK Industries, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   9.00% 9.50% [7]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (4)  
Amount of Interest, Fees or Dividends Credited to Income   85  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 7,200 [2],[7] 3,700  
Gross Additions   4  
Gross Reductions   304  
Ending balance   3,400  
Investment, Identifier [Axis]: KBK Industries, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 0    
Ending balance 0    
Investment, Identifier [Axis]: KBK Industries, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (34)    
Amount of Interest, Fees or Dividends Credited to Income 51    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 7,200    
Gross Additions 34    
Gross Reductions 7,234    
Ending balance 0    
Investment, Identifier [Axis]: KMS, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,270 [2],[11],[17] 0  
Gross Additions 0 4,890  
Gross Reductions 0 0  
Ending balance $ 6,270 [5],[9],[19] $ 4,890  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.20% [9],[19],[23] 14.50%  
Spread 5.50% [9],[19],[21],[23] 9.75% 5.50% [11],[17],[24],[25],[26]
Amount of Realized Gain/(Loss)   $ (415)  
Amount of Unrealized Gain/(Loss)   339  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ (40) [2],[11],[17],[25],[26] 663  
Gross Additions   0  
Gross Reductions   663  
Ending balance $ 1,303 [5],[9],[19],[23] $ 0  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 12.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 22    
Amount of Interest, Fees or Dividends Credited to Income 41    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,146    
Gross Additions 27    
Gross Reductions 0    
Ending balance $ 1,173    
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Total Rate 12.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 31    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,007    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 1,007    
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 1.3      
Schedule of Investments [Line Items]      
Total Rate 9.20%    
Spread 5.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 36    
Amount of Interest, Fees or Dividends Credited to Income 15    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (40)    
Gross Additions 1,343    
Gross Reductions 0    
Ending balance $ 1,303    
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.50% [9],[19] 14.50% 12.50% [11],[17]
Spread   9.75%  
Amount of Realized Gain/(Loss)   $ (3,037)  
Amount of Unrealized Gain/(Loss)   2,562  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 1,146 [2],[11],[17] 4,779  
Gross Additions   0  
Gross Reductions   4,779  
Ending balance $ 1,173 [5],[9],[19] $ 0  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 12.50% [9],[19]   12.50% [11],[17]
Spread   9.75%  
PIK Rate   14.23%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   7  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 1,007 [2],[11],[17] 450  
Gross Additions   0  
Gross Reductions   450  
Ending balance 1,007 [5],[9],[19] $ 0  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Spread   9.75%  
PIK Rate   14.23%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   7  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   440  
Gross Additions   0  
Gross Reductions   440  
Ending balance   $ 0  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate   14.23%  
Spread   9.75%  
PIK Rate   14.23%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   3  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   $ 0  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 6      
Schedule of Investments [Line Items]      
Total Rate   12.50%  
PIK Rate   12.50%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   20  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   1,073  
Gross Reductions   0  
Ending balance   $ 1,073  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 7      
Schedule of Investments [Line Items]      
Total Rate   12.50%  
PIK Rate   12.50%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   20  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   1,144  
Gross Reductions   0  
Ending balance   1,144  
Investment, Identifier [Axis]: Kennedy Fab HoldCo, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 11,490    
Gross Reductions 0    
Ending balance [5],[9] 11,490    
Investment, Identifier [Axis]: Kennedy Fab HoldCo, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 22    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 5    
Ending balance [5],[9],[22] $ (5)    
Investment, Identifier [Axis]: Kennedy Fab HoldCo, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [9] 13.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 533    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 29,705    
Gross Reductions 0    
Ending balance [5],[9] $ 29,705    
Investment, Identifier [Axis]: Kennedy Fab HoldCo, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [9] 9.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 301    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 19,961    
Gross Reductions 0    
Ending balance [5],[9] 19,961    
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 24 30  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,190 [2],[7],[27],[36] 2,710  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 4,190 [5],[8],[28],[37] 2,710  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 1,170 650  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 17,180 [2],[7],[27] 12,240  
Gross Additions 1,170 650  
Gross Reductions 0 0  
Ending balance $ 18,350 [5],[8],[28] $ 12,890  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.50% [8] 11.50% 11.50% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 294 423  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 10,195 [2],[7] 14,987  
Gross Additions 1 2  
Gross Reductions 0 800  
Ending balance $ 10,196 [5],[8] $ 14,189  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.00% [8] 9.00% 9.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 88 89  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,878 [2],[7] 3,926  
Gross Additions 0 0  
Gross Reductions 12 12  
Ending balance 3,866 [5],[8] 3,914  
Investment, Identifier [Axis]: LKCM Headwater Investments I, L.P. | LP Interests      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[27],[40],[45],[46] 792    
Investment, Identifier [Axis]: LKCM Headwater Investments | Common Equity (LKCM Headwater CV I Minerals, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[20],[42],[47],[48] 618    
Investment, Identifier [Axis]: LKCM Headwater Investments | LP Interests (LKCM Headwater Investments I, L.P.)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[20],[28],[42],[47],[48] $ 265    
Investment, Identifier [Axis]: LLFlex, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 11.81% [19],[20],[23]   12.14% [17],[18],[26]
Spread 8.00% [19],[20],[21],[23]   8.00% [17],[18],[24],[26]
PIK Rate 3.00% [13],[19],[20],[23]   3.00% [14],[17],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 3,328    
Ending balance [5],[19],[20],[23] 3,453    
Investment, Identifier [Axis]: Legacy Swim Group | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 186    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[27] 14,996    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[8],[28] $ 14,996    
Investment, Identifier [Axis]: Legacy Swim Group | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.00% [8]   13.00% [7]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 1,056    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] 31,691    
Gross Additions 16    
Gross Reductions 0    
Ending balance [5],[8] $ 31,707    
Investment, Identifier [Axis]: Logix Acquisition Company, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.17% [19],[20],[23]   11.41% [17],[18],[26]
Spread 7.50% [19],[20],[21],[23]   7.50% [17],[18],[24],[26]
PIK Rate 2.75% [13],[19],[20],[23]   2.75% [14],[17],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 44,135    
Ending balance [5],[19],[20],[23] 44,438    
Investment, Identifier [Axis]: Logix Acquisition Company, LLC | Secured Debt 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 2,204    
Ending balance [5],[19],[20] 2,260    
Investment, Identifier [Axis]: Looking Glass Investments, LLC | Member Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[40],[46] 25    
Ending balance [5],[20],[42],[48] 25    
Investment, Identifier [Axis]: MCT Purchaserco Holding Inc. | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[40],[41] 1,139    
Ending balance [5],[19],[20],[42],[43] $ 1,139    
Investment, Identifier [Axis]: MCT Purchaserco Holding Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.20% [19],[20],[23],[42],[43]   9.36% [17],[18],[26],[40],[41]
Spread 5.50% [19],[20],[21],[23],[42],[43]   5.50% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 5,985    
Ending balance [5],[19],[20],[23],[42],[43] $ 8,838    
Investment, Identifier [Axis]: MCT Purchaserco Holding Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.17% [19],[20],[23],[42],[43]   9.29% [17],[18],[26],[40],[41]
Spread 5.50% [19],[20],[21],[23],[42],[43]   5.50% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 39,364    
Ending balance [5],[19],[20],[23],[42],[43] 39,284    
Investment, Identifier [Axis]: MS Private Loan Fund I, LP | LP Interests      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (1,104) (177)  
Amount of Interest, Fees or Dividends Credited to Income 363 479  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 14,697 [2],[7],[27],[40],[45],[46] 14,034  
Gross Additions 0 0  
Gross Reductions 1,104 177  
Ending balance $ 13,593 [5],[8],[28],[42],[47],[48] $ 13,857  
Investment, Identifier [Axis]: MS Private Loan Fund I, LP | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 6.69% [8],[23],[42],[48] 5.00% 6.88% [7],[26],[40],[46]
Spread 3.00% [8],[21],[23],[42],[48]   3.00% [7],[24],[26],[40],[46]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 175 55  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,000 [2],[7],[26],[40],[46] 1,600  
Gross Additions 4,300 10,100  
Gross Reductions 4,000 1,700  
Ending balance 12,300 [5],[8],[23],[42],[48] 10,000  
Investment, Identifier [Axis]: MS Private Loan Fund II, LP | LP Interests      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 89 0  
Amount of Interest, Fees or Dividends Credited to Income 498 219  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 11,064 [2],[7],[27],[40],[45],[46] 7,843  
Gross Additions 89 708  
Gross Reductions 0 0  
Ending balance $ 11,153 [5],[8],[28],[42],[47],[48] $ 8,551  
Investment, Identifier [Axis]: MS Private Loan Fund II, LP | Secured Debt      
Schedule of Investments [Line Items]      
Spread 3.00% [8],[21],[22],[23],[42],[48] 3.50% 3.00% [7],[24],[25],[26],[40],[46]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 12 12  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (84) [2],[7],[25],[26],[40],[46] (59)  
Gross Additions 257 605  
Gross Reductions 250 650  
Ending balance (77) [5],[8],[22],[23],[42],[48] (104)  
Investment, Identifier [Axis]: MSC Adviser I, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (21,960) (7,830)  
Amount of Interest, Fees or Dividends Credited to Income 2,868 2,493  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 255,020 [2],[7],[27],[54] 246,000  
Gross Additions 0 0  
Gross Reductions 21,960 7,830  
Ending balance 233,060 [5],[8],[28],[55] 238,170  
Investment, Identifier [Axis]: MSC Income Fund, Inc. | Common Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (1,675) 202  
Amount of Interest, Fees or Dividends Credited to Income 729 495  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 21,412 [2],[7],[27],[40],[46] 16,810  
Gross Additions 4,930 4,702  
Gross Reductions 1,675 0  
Ending balance $ 24,667 [5],[8],[28],[42],[48] $ 21,512  
Investment, Identifier [Axis]: MSC Income Fund, Inc. | Secured Debt      
Schedule of Investments [Line Items]      
Spread [8],[21],[22],[23],[42],[48] 4.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 53    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 23,853    
Gross Reductions 24,000    
Ending balance [5],[8],[22],[23],[42],[48] (147)    
Investment, Identifier [Axis]: MVI MSO, LLC 1      
Schedule of Investments [Line Items]      
Total Rate   13.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   199  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   9,753  
Gross Reductions   0  
Ending balance   9,753  
Investment, Identifier [Axis]: MVI MSO, LLC 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   2,700  
Gross Reductions   0  
Ending balance   2,700  
Investment, Identifier [Axis]: MVI MSO, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (690)    
Amount of Interest, Fees or Dividends Credited to Income 81    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[27] 4,770    
Gross Additions 0    
Gross Reductions 690    
Ending balance [5],[8],[28] $ 4,080    
Investment, Identifier [Axis]: MVI MSO, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.00% [8]   13.00% [7]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 325    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] 9,768    
Gross Additions 4    
Gross Reductions 0    
Ending balance [5],[8] 9,772    
Investment, Identifier [Axis]: Metalforming Holdings, LLC | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 290 520  
Amount of Interest, Fees or Dividends Credited to Income 490 698  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 9,770 [2],[7],[27] 6,850  
Gross Additions 290 520  
Gross Reductions 0 0  
Ending balance $ 10,060 [5],[8],[28] $ 7,370  
Investment, Identifier [Axis]: Metalforming Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Total Rate 8.00% [8],[28] 8.00% 8.00% [7],[27]
PIK Rate 8.00% [8],[13],[28] 8.00% 8.00% [7],[14],[27]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 (481)  
Amount of Interest, Fees or Dividends Credited to Income 120 604  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,916 [2],[7],[27] 6,397  
Gross Additions 0 0  
Gross Reductions 0 481  
Ending balance 5,916 [5],[8],[28] 5,916  
Investment, Identifier [Axis]: Metalforming Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 3 6  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25],[29] (11)  
Gross Additions 0 4  
Gross Reductions 0 0  
Ending balance $ 0 [5],[8],[22] $ (7)  
Investment, Identifier [Axis]: Metalforming Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 8.75% [8] 9.75% 8.75% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (8) 0  
Amount of Interest, Fees or Dividends Credited to Income 386 498  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 17,237 [2],[7] 20,844  
Gross Additions 8 20  
Gross Reductions 8 1,931  
Ending balance $ 17,237 [5],[8] 18,933  
Investment, Identifier [Axis]: Microbe Formulas, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.50% [19],[20],[21],[22],[23]   5.50% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (27)    
Ending balance [5],[19],[20],[22],[23] $ (24)    
Investment, Identifier [Axis]: Microbe Formulas, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.27% [19],[20],[23]   9.32% [17],[18],[26]
Spread 5.50% [19],[20],[21],[23]   5.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 11,023    
Ending balance [5],[19],[20],[23] $ 10,995    
Investment, Identifier [Axis]: Microbe Formulas, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.27% [19],[20],[23]   9.32% [17],[18],[26]
Spread 5.50% [19],[20],[21],[23]   5.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 13,886    
Ending balance [5],[19],[20],[23] 13,346    
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC | Common Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (500)  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   13,840  
Gross Additions   0  
Gross Reductions   500  
Ending balance   $ 13,340  
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (1,105)    
Amount of Interest, Fees or Dividends Credited to Income 278    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[17],[36] 12,557    
Gross Additions 278    
Gross Reductions 1,105    
Ending balance [5],[9],[19],[28],[37] $ 11,730    
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   9.79%  
Spread   5.50%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   44  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   2,652  
Gross Reductions   0  
Ending balance   $ 2,652  
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.81% [9],[19],[23]   9.81% [11],[17],[26]
Spread 5.50% [9],[19],[21],[23]   5.50% [11],[17],[24],[26]
PIK Rate 9.81% [9],[13],[19],[23]   9.81% [11],[14],[17],[26]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 71    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[17],[26] 2,796    
Gross Additions 71    
Gross Reductions 0    
Ending balance [5],[9],[19],[23] $ 2,867    
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.17% [9],[19],[23],[51]   9.32% [11],[17],[26],[52]
Spread 5.50% [9],[19],[21],[23],[51]   5.50% [11],[17],[24],[26],[52]
PIK Rate 9.17% [9],[13],[19],[23],[51]   9.32% [11],[14],[17],[26],[52]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 40    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[17],[26],[52] 1,664    
Gross Additions 42    
Gross Reductions 0    
Ending balance [5],[9],[19],[23],[51] 1,706    
Investment, Identifier [Axis]: Mini Melts of America, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 280    
Ending balance [5],[19],[20] $ 230    
Investment, Identifier [Axis]: Mini Melts of America, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.92% [19],[20],[23],[30]   10.06% [17],[18],[26],[31]
Spread 6.25% [19],[20],[21],[23],[30]   6.25% [17],[18],[24],[26],[31]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[31] $ 1,361    
Ending balance [5],[19],[20],[23],[30] $ 1,429    
Investment, Identifier [Axis]: Mini Melts of America, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.92% [19],[20],[23],[51]   10.05% [17],[18],[26],[52]
Spread 6.25% [19],[20],[21],[23],[51]   6.25% [17],[18],[24],[26],[52]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[52] $ 1,246    
Ending balance [5],[19],[20],[23],[51] $ 1,208    
Investment, Identifier [Axis]: Mini Melts of America, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 8.92% [19],[20],[23]   9.07% [17],[18],[26]
Spread 5.25% [19],[20],[21],[23]   5.25% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 4,615    
Ending balance [5],[19],[20],[23] $ 4,472    
Investment, Identifier [Axis]: Mini Melts of America, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 10.92% [19],[20],[23]   11.07% [17],[18],[26]
Spread 7.25% [19],[20],[21],[23]   7.25% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 4,597    
Ending balance [5],[19],[20],[23] 4,470    
Investment, Identifier [Axis]: Mission Critical Group | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 15,530    
Ending balance [5],[19],[20] $ 22,240    
Investment, Identifier [Axis]: Mission Critical Group | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.50% [19],[20],[21],[22],[23]   5.50% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (196)    
Ending balance [5],[19],[20],[22],[23] $ (184)    
Investment, Identifier [Axis]: Mission Critical Group | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.17% [19],[20],[23]   9.33% [17],[18],[26]
Spread 5.50% [19],[20],[21],[23]   5.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 14,698    
Ending balance [5],[19],[20],[23] $ 14,661    
Investment, Identifier [Axis]: Mission Critical Group | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.17% [19],[20],[23]   9.23% [17],[18],[26]
Spread 5.50% [19],[20],[21],[23]   5.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 66,099    
Ending balance [5],[19],[20],[23] 65,932    
Investment, Identifier [Axis]: Moffitt Holdings, LLC 1      
Schedule of Investments [Line Items]      
Total Rate   13.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   520  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   34,656  
Gross Reductions   0  
Ending balance   34,656  
Investment, Identifier [Axis]: Moffitt Holdings, LLC 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   14,300  
Gross Reductions   0  
Ending balance   $ 14,300  
Investment, Identifier [Axis]: Moffitt Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] 15,560    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[8] $ 15,560    
Investment, Identifier [Axis]: Moffitt Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.00% [8]   13.00% [7]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 1,115    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] 33,840    
Gross Additions 20    
Gross Reductions 438    
Ending balance [5],[8] $ 33,422    
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Total Rate 12.00% [9],[28] 12.00% 12.00% [11],[27]
PIK Rate 12.00% [9],[13],[28] 12.00% 12.00% [11],[14],[27]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 130 0  
Amount of Interest, Fees or Dividends Credited to Income 58 51  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,112 [2],[11],[27] 1,707  
Gross Additions 188 51  
Gross Reductions 0 0  
Ending balance $ 2,300 [5],[9],[28] $ 1,758  
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 14.00% [9] 14.00% 14.00% [11]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 342 370  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 7,696 [2],[11] 8,967  
Gross Additions 63 34  
Gross Reductions 596 0  
Ending balance 7,163 [5],[9] 9,001  
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC | Warrants      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 70 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 800 [2],[11],[34] 594  
Gross Additions 70 0  
Gross Reductions 0 0  
Ending balance 870 [5],[9],[35] 594  
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[40],[41] 707    
Ending balance [5],[19],[20],[42],[43] $ 545    
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.21% [19],[20],[23],[42],[43]   10.18% [17],[18],[26],[40],[41]
Spread 6.25% [19],[20],[21],[23],[42],[43]   6.25% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 4,417    
Ending balance [5],[19],[20],[23],[42],[43] $ 4,329    
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.21% [19],[20],[23],[42],[43]   10.18% [17],[18],[26],[40],[41]
Spread 6.25% [19],[20],[21],[23],[42],[43]   6.25% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 12,399    
Ending balance [5],[19],[20],[23],[42],[43] $ 12,121    
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.21% [19],[20],[23],[42],[43]   10.18% [17],[18],[26],[40],[41]
Spread 6.25% [19],[20],[21],[23],[42],[43]   6.25% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 17,933    
Ending balance [5],[19],[20],[23],[42],[43] $ 17,890    
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 10.21% [19],[20],[23],[42],[43]   10.18% [17],[18],[26],[40],[41]
Spread 6.25% [19],[20],[21],[23],[42],[43]   6.25% [17],[18],[24],[26],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40],[41] $ 1,244    
Ending balance [5],[19],[20],[23],[42],[43] 1,216    
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Unsecured Debt      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[40],[41]     8.00%
PIK Rate [14],[17],[18],[40],[41]     8.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[40],[41] 81    
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   942  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   26,370  
Gross Additions   0  
Gross Reductions   0  
Ending balance   26,370  
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   $ 0  
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate   10.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (2)  
Amount of Interest, Fees or Dividends Credited to Income   145  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   5,746  
Gross Additions   2  
Gross Reductions   2  
Ending balance   5,746  
Investment, Identifier [Axis]: NAPCO Precast, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (160)  
Amount of Interest, Fees or Dividends Credited to Income   137  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   9,050  
Gross Additions   0  
Gross Reductions   160  
Ending balance   8,890  
Investment, Identifier [Axis]: NAPCO Precast, LLC | Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (3,330)    
Amount of Interest, Fees or Dividends Credited to Income 42    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[27] 14,480    
Gross Additions 0    
Gross Reductions 3,330    
Ending balance [5],[8],[28] 11,150    
Investment, Identifier [Axis]: NAPCO Precast, LLC | Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 7    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[36] 568    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[8],[28],[37] 568    
Investment, Identifier [Axis]: NRP Jones, LLC | Common Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[36] 928    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[8],[37] 928    
Investment, Identifier [Axis]: NRP Jones, LLC | Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 (1,178)  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 2,696  
Gross Additions 0 0  
Gross Reductions 0 1,178  
Ending balance 0 [5],[8] 1,518  
Investment, Identifier [Axis]: NRP Jones, LLC | Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 (32)  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 94  
Gross Additions 0 0  
Gross Reductions 0 32  
Ending balance 0 [5],[8] 62  
Investment, Identifier [Axis]: NRP Jones, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 756  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 0  
Gross Additions 0 1,238  
Gross Reductions 0 0  
Ending balance $ 0 [5],[8] $ 1,238  
Investment, Identifier [Axis]: NRP Jones, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.00% [8],[15] 12.00% 12.00% [7],[16]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (105) 0  
Amount of Interest, Fees or Dividends Credited to Income 0 70  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 474 [2],[7],[16] 2,178  
Gross Additions 0 5  
Gross Reductions 104 0  
Ending balance 370 [5],[8],[15] 2,183  
Investment, Identifier [Axis]: Nearshore AcquireCo, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 5,260    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[9] 5,260    
Investment, Identifier [Axis]: Nearshore AcquireCo, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[25] (24)    
Gross Additions 1    
Gross Reductions 0    
Ending balance [5],[9],[22] (23)    
Investment, Identifier [Axis]: Nearshore AcquireCo, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[25] (61)    
Gross Additions 3    
Gross Reductions 0    
Ending balance [5],[9],[22] $ (58)    
Investment, Identifier [Axis]: Nearshore AcquireCo, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 13.00% [9]   13.00% [11]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 723    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 21,688    
Gross Additions 11    
Gross Reductions 0    
Ending balance [5],[9] 21,699    
Investment, Identifier [Axis]: Nebraska Vet AcquireCo, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   28,520  
Amount of Interest, Fees or Dividends Credited to Income   570  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   32,040  
Gross Additions   28,520  
Gross Reductions   0  
Ending balance   $ 60,560  
Investment, Identifier [Axis]: Nebraska Vet AcquireCo, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread   7.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (1)  
Amount of Interest, Fees or Dividends Credited to Income   3  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   1  
Gross Reductions   1  
Ending balance   $ 0  
Investment, Identifier [Axis]: Nebraska Vet AcquireCo, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate   12.50%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (12)  
Amount of Interest, Fees or Dividends Credited to Income   1,956  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   62,200  
Gross Additions   12  
Gross Reductions   12  
Ending balance   $ 62,200  
Investment, Identifier [Axis]: Nebraska Vet AcquireCo, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate   12.50%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (8)  
Amount of Interest, Fees or Dividends Credited to Income   224  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   4,650  
Gross Additions   2,608  
Gross Reductions   8  
Ending balance   7,250  
Investment, Identifier [Axis]: Nello Industries Investco, LLC | Common Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   940  
Amount of Interest, Fees or Dividends Credited to Income   171  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   15,560  
Gross Additions   940  
Gross Reductions   0  
Ending balance   $ 16,500  
Investment, Identifier [Axis]: Nello Industries Investco, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 6,220    
Amount of Interest, Fees or Dividends Credited to Income 274    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[27] 23,330    
Gross Additions 6,220    
Gross Reductions 0    
Ending balance [5],[8],[28] $ 29,550    
Investment, Identifier [Axis]: Nello Industries Investco, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.50% [8]   12.50% [7]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] $ 32,072    
Ending balance [5],[8] 41,272    
Investment, Identifier [Axis]: Nello Industries Investco, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread   6.50%  
Amount of Realized Gain/(Loss) 0 $ 0  
Amount of Unrealized Gain/(Loss) (205) 0  
Amount of Interest, Fees or Dividends Credited to Income 550 16  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 32,072 (16)  
Gross Additions 0 16  
Gross Reductions 32,072 0  
Ending balance $ 0 $ 0  
Investment, Identifier [Axis]: Nello Industries Investco, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.50% 13.50%  
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 205 0  
Amount of Interest, Fees or Dividends Credited to Income 818 932  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 26,959  
Gross Additions 41,272 13  
Gross Reductions 0 0  
Ending balance 41,272 26,972  
Investment, Identifier [Axis]: NexRev LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (280) 1,510  
Amount of Interest, Fees or Dividends Credited to Income 24 413  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,870 11,910  
Gross Additions 0 1,510  
Gross Reductions 280 0  
Ending balance 12,590 [5],[8] 13,420  
Investment, Identifier [Axis]: NexRev LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   0  
Investment, Identifier [Axis]: NexRev LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (9)  
Amount of Interest, Fees or Dividends Credited to Income   151  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   9,811  
Gross Additions   9  
Gross Reductions   9,820  
Ending balance   0  
Investment, Identifier [Axis]: NuStep, LLC | Preferred Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   650  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,110 [2],[7] 11,550  
Gross Additions   650  
Gross Reductions   0  
Ending balance 6,290 [5],[8] 12,200  
Investment, Identifier [Axis]: NuStep, LLC | Preferred Member Units 1.1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (1,270)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,200    
Gross Additions 0    
Gross Reductions 1,270    
Ending balance 10,930    
Investment, Identifier [Axis]: NuStep, LLC | Preferred Member Units 1.2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 180    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,110    
Gross Additions 180    
Gross Reductions 0    
Ending balance 6,290    
Investment, Identifier [Axis]: NuStep, LLC | Preferred Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,200 [2],[7] 6,000  
Gross Additions   0  
Gross Reductions   0  
Ending balance $ 10,930 [5],[8] $ 6,000  
Investment, Identifier [Axis]: NuStep, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.29% [8],[23] 10.98% 10.48% [7],[26],[29]
Spread 6.50% [8],[21],[23] 6.50% 6.50% [7],[24],[26],[29]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   99  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 1,000 [2],[7],[26],[29] 3,600  
Gross Additions   0  
Gross Reductions   0  
Ending balance $ 2,600 [5],[8],[23] $ 3,600  
Investment, Identifier [Axis]: NuStep, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 10.29%    
Spread 6.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 63    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,000    
Gross Additions 1,600    
Gross Reductions 0    
Ending balance $ 2,600    
Investment, Identifier [Axis]: NuStep, LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Total Rate 12.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 571    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 18,440    
Gross Additions 0    
Gross Reductions 274    
Ending balance $ 18,166    
Investment, Identifier [Axis]: NuStep, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00% [8] 12.00% 12.00% [7],[29]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   554  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 18,440 [2],[7],[29] 18,439  
Gross Additions   1  
Gross Reductions   0  
Ending balance 18,166 [5],[8] 18,440  
Investment, Identifier [Axis]: OMi Topco, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 1,140 3,100  
Amount of Interest, Fees or Dividends Credited to Income 3,083 7,487  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 77,900 [2],[7],[27] 72,720  
Gross Additions 1,140 3,100  
Gross Reductions 0 0  
Ending balance $ 79,040 [5],[8],[28] 75,820  
Investment, Identifier [Axis]: OMi Topco, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 12.00% [8]   12.00% [7]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (3)    
Amount of Interest, Fees or Dividends Credited to Income 873    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] 29,000    
Gross Additions 3    
Gross Reductions 3    
Ending balance [5],[8] 29,000    
Investment, Identifier [Axis]: OMi Topco, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (30)  
Amount of Interest, Fees or Dividends Credited to Income   207  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   9,000  
Gross Additions   0  
Gross Reductions   9,000  
Ending balance   $ 0  
Investment, Identifier [Axis]: OMi Topco, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate   12.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   49  
Amount of Interest, Fees or Dividends Credited to Income   101  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   14,000  
Gross Reductions   0  
Ending balance   14,000  
Investment, Identifier [Axis]: OMi Topco, LLC, Preferred Member Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[27] $ 12,870    
Investment, Identifier [Axis]: Obra Capital, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 7.25% [19],[20],[21],[22],[23]   7.25% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (3)    
Ending balance [5],[19],[20],[22],[23] $ (3)    
Investment, Identifier [Axis]: Obra Capital, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.04% [19],[20],[23]   11.09% [17],[18],[26]
Spread 7.25% [19],[20],[21],[23]   7.25% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 26,089    
Ending balance [5],[19],[20],[23] $ 26,023    
Investment, Identifier [Axis]: Obra Capital, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 11.04% [19],[20],[23]   11.09% [17],[18],[26]
Spread 7.25% [19],[20],[21],[23]   7.25% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 3,155    
Ending balance [5],[19],[20],[23] 3,147    
Investment, Identifier [Axis]: OnAsset Intelligence, Inc. | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[11] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[9] $ 0  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc. | Preferred Stock      
Schedule of Investments [Line Items]      
Total Rate 7.00% [9] 7.00% 7.00% [11]
PIK Rate 7.00% [9],[13] 7.00% 7.00% [11],[14]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[11] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[9] $ 0  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.00% [9],[15] 12.00% 12.00% [11],[16]
PIK Rate 12.00% [9],[13],[15] 12.00% 12.00% [11],[14],[16]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 645 [2],[11],[16] 99  
Gross Additions   0  
Gross Reductions   0  
Ending balance $ 646 [5],[9],[15] $ 99  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc. | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 12.00%    
PIK Rate 12.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 141    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 141    
Investment, Identifier [Axis]: OnAsset Intelligence, Inc. | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Total Rate 12.00%    
PIK Rate 12.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 144    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 144    
Investment, Identifier [Axis]: OnAsset Intelligence, Inc. | Secured Debt 1.3      
Schedule of Investments [Line Items]      
Total Rate 12.00%    
PIK Rate 12.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 309    
Gross Additions 0    
Gross Reductions 0    
Ending balance $ 309    
Investment, Identifier [Axis]: OnAsset Intelligence, Inc. | Secured Debt 1.4      
Schedule of Investments [Line Items]      
Total Rate 12.00%    
PIK Rate 12.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 645    
Gross Additions 1    
Gross Reductions 0    
Ending balance $ 646    
Investment, Identifier [Axis]: OnAsset Intelligence, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00% [9],[15] 12.00% 12.00% [11],[16]
PIK Rate 12.00% [9],[13],[15] 12.00% 12.00% [11],[14],[16]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 309 [2],[11],[16] 101  
Gross Additions   0  
Gross Reductions   0  
Ending balance $ 309 [5],[9],[15] $ 101  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 12.00% [9],[15] 12.00% 12.00% [11],[16]
PIK Rate 12.00% [9],[13],[15] 12.00% 12.00% [11],[14],[16]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 144 [2],[11],[16] 218  
Gross Additions   0  
Gross Reductions   0  
Ending balance $ 144 [5],[9],[15] $ 218  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 12.00% [9],[15] 12.00% 12.00% [11],[16]
PIK Rate 12.00% [9],[13],[15] 12.00% 12.00% [11],[14],[16]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 141 [2],[11],[16] 457  
Gross Additions   0  
Gross Reductions   0  
Ending balance $ 141 [5],[9],[15] $ 457  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc. | Unsecured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.00% [9],[15] 10.00% 10.00% [11],[16]
PIK Rate 10.00% [9],[13],[15] 10.00% 10.00% [11],[14],[16]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[11],[16] 305  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 [5],[9],[15] 305  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc. | Warrants      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[11],[34] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[9],[35] 0  
Investment, Identifier [Axis]: OnPoint Industrial Services, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.45% [19],[20],[23]   9.42% [17],[18],[26]
Spread 5.75% [19],[20],[21],[23]   5.75% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 1,386    
Ending balance [5],[19],[20],[23] $ 1,383    
Investment, Identifier [Axis]: OnPoint Industrial Services, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.45% [19],[20],[23]   9.42% [17],[18],[26]
Spread 5.75% [19],[20],[21],[23]   5.75% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 3,851    
Ending balance [5],[19],[20],[23] 3,841    
Investment, Identifier [Axis]: Oneliance, LLC | Preferred Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 250  
Amount of Interest, Fees or Dividends Credited to Income 13 52  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,270 [2],[11],[27] 2,580  
Gross Additions 0 250  
Gross Reductions 0 0  
Ending balance 3,270 [5],[9],[28] 2,830  
Investment, Identifier [Axis]: Orttech Holdings, LLC | Preferred Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 60 60  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 13,450 [2],[7],[36] 13,450  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 13,450 [5],[8],[37] $ 13,450  
Investment, Identifier [Axis]: Orttech Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [7],[26]     14.98%
Spread 11.00% [8],[21],[22],[23] 11.00% 11.00% [7],[24],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 16 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 612 [2],[7],[26] 0  
Gross Additions 0 0  
Gross Reductions 612 0  
Ending balance $ 0 [5],[8],[22],[23] $ 0  
Investment, Identifier [Axis]: Orttech Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 14.79% [8],[23] 15.48% 14.98% [7],[26]
Spread 11.00% [8],[21],[23] 11.00% 11.00% [7],[24],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (10) (12)  
Amount of Interest, Fees or Dividends Credited to Income 779 846  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 20,760 [2],[7],[26] 21,960  
Gross Additions 10 12  
Gross Reductions 10 412  
Ending balance 20,760 [5],[8],[23] 21,560  
Investment, Identifier [Axis]: Ospemifene Royalty Sub LLC | Secured Debt      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[16],[17],[18] 19    
Ending balance [5],[15],[19],[20] 6    
Investment, Identifier [Axis]: Other | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)    
Amount of Unrealized Gain/(Loss)    
Amount of Interest, Fees or Dividends Credited to Income    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance    
Gross Additions    
Gross Reductions    
Ending balance    
Investment, Identifier [Axis]: PPL RVs, Inc. | Common Stock 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (1,620) 1,050  
Amount of Interest, Fees or Dividends Credited to Income 0 177  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 17,330 [2],[7],[27] 17,110  
Gross Additions 0 1,050  
Gross Reductions 1,620 0  
Ending balance 15,710 [5],[8],[28] 18,160  
Investment, Identifier [Axis]: PPL RVs, Inc. | Common Stock 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 575 [2],[7],[27],[36] 514  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 575 [5],[8],[28],[37] $ 514  
Investment, Identifier [Axis]: PPL RVs, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 8.75% [8],[21],[22],[23] 7.00% 8.75% [7],[24],[25],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25],[26] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[8],[22],[23] $ 0  
Investment, Identifier [Axis]: PPL RVs, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.60% [8],[23] 11.48% 13.04% [7],[26]
Spread 8.75% [8],[21],[23] 7.00% 8.75% [7],[24],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (9) (15)  
Amount of Interest, Fees or Dividends Credited to Income 487 489  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 15,191 [2],[7],[26] 16,456  
Gross Additions 9 15  
Gross Reductions 9 915  
Ending balance $ 15,191 [5],[8],[23] 15,556  
Investment, Identifier [Axis]: PavCon LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread [19],[20],[21],[22],[23] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[22],[23] $ (29)    
Investment, Identifier [Axis]: PavCon LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread [19],[20],[21],[22],[23] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[22],[23] $ (29)    
Investment, Identifier [Axis]: PavCon LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 9.46%    
Spread [19],[20],[21],[23] 5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[23] $ 10,644    
Investment, Identifier [Axis]: Peaches Holding Corporation | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18] 0    
Ending balance [5],[20] 0    
Investment, Identifier [Axis]: Pinnacle TopCo, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 1,740  
Amount of Interest, Fees or Dividends Credited to Income 332 782  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 20,440 [2],[7],[27] 18,360  
Gross Additions 0 1,740  
Gross Reductions 0 0  
Ending balance 20,440 [5],[8],[28] 20,100  
Investment, Identifier [Axis]: Pinnacle TopCo, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (1) (1)  
Amount of Interest, Fees or Dividends Credited to Income 3 3  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25] 0  
Gross Additions 1 1  
Gross Reductions 1 1  
Ending balance $ 0 [5],[8],[22] $ 0  
Investment, Identifier [Axis]: Pinnacle TopCo, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [8] 13.00% 13.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (18) (14)  
Amount of Interest, Fees or Dividends Credited to Income 885 945  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 27,200 [2],[7] 28,640  
Gross Additions 18 14  
Gross Reductions 818 14  
Ending balance $ 26,400 [5],[8] 28,640  
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.16% [19],[20],[23],[42]   9.35% [17],[18],[26],[40]
Spread 5.50% [19],[20],[21],[23],[42]   5.50% [17],[18],[24],[26],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40] $ 7,800    
Ending balance [5],[19],[20],[23],[42] $ 7,780    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.20% [19],[20],[23],[42]   9.17% [17],[18],[26],[40]
Spread 5.50% [19],[20],[21],[23],[42]   5.50% [17],[18],[24],[26],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40] $ 745    
Ending balance [5],[19],[20],[23],[42] $ 743    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.20% [19],[20],[23],[42]   9.17% [17],[18],[26],[40]
Spread 5.50% [19],[20],[21],[23],[42]   5.50% [17],[18],[24],[26],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40] $ 749    
Ending balance [5],[19],[20],[23],[42] $ 747    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 8.95% [19],[20],[23],[42]   8.92% [17],[18],[26],[40]
Spread 5.25% [19],[20],[21],[23],[42]   5.25% [17],[18],[24],[26],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40] $ 851    
Ending balance [5],[19],[20],[23],[42] $ 848    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate 8.92% [19],[20],[23],[42]   9.12% [17],[18],[26],[40]
Spread 5.25% [19],[20],[21],[23],[42]   5.25% [17],[18],[24],[26],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40] $ 1,886    
Ending balance [5],[19],[20],[23],[42] $ 1,881    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 6      
Schedule of Investments [Line Items]      
Total Rate 8.92% [19],[20],[23],[42]   9.09% [17],[18],[26],[40]
Spread 5.25% [19],[20],[21],[23],[42]   5.25% [17],[18],[24],[26],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40] $ 2,021    
Ending balance [5],[19],[20],[23],[42] $ 2,016    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 7      
Schedule of Investments [Line Items]      
Total Rate 8.41% [19],[20],[23],[42]   8.63% [17],[18],[26],[40]
Spread 4.75% [19],[20],[21],[23],[42]   4.75% [17],[18],[24],[26],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[40] $ 2,108    
Ending balance [5],[19],[20],[23],[42] $ 2,123    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 8      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23],[42] 8.41%    
Spread [19],[20],[21],[23],[42] 4.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[23],[42] $ 11,573    
Investment, Identifier [Axis]: Principle Environmental, LLC | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 20  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 750 [2],[7] 600  
Gross Additions 0 20  
Gross Reductions 0 0  
Ending balance 750 [5],[8] 620  
Investment, Identifier [Axis]: Principle Environmental, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 350  
Amount of Interest, Fees or Dividends Credited to Income 1,554 327  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 15,740 [2],[7],[27] 12,600  
Gross Additions 0 350  
Gross Reductions 0 0  
Ending balance $ 15,740 [5],[8],[28] $ 12,950  
Investment, Identifier [Axis]: Principle Environmental, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.00% [8] 13.00% 13.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (5) 0  
Amount of Interest, Fees or Dividends Credited to Income 164 164  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,897 [2],[7] 4,861  
Gross Additions 5 4  
Gross Reductions 5 0  
Ending balance 4,897 [5],[8] 4,865  
Investment, Identifier [Axis]: Quality Lease Service, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 460 [2],[7] 460  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 460 [5],[8] 460  
Investment, Identifier [Axis]: RA Outdoors LLC | Common Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[11],[17] 0  
Gross Additions   0  
Gross Reductions   0  
Ending balance $ 0 [5],[9],[19] $ 0  
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.56% [9],[19],[23] 11.25% 10.89% [11],[17],[26]
Spread 6.75% [9],[19],[21],[23] 6.75% 6.75% [11],[17],[24],[26]
PIK Rate 10.56% [9],[13],[19],[23]   10.89% [11],[14],[17],[26]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (20)  
Amount of Interest, Fees or Dividends Credited to Income   40  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 1,182 [2],[11],[17],[26] 1,257  
Gross Additions   3  
Gross Reductions   60  
Ending balance $ 1,219 [5],[9],[19],[23] $ 1,200  
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 10.56%    
Spread 6.75%    
PIK Rate 10.56%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 38    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,182    
Gross Additions 37    
Gross Reductions 0    
Ending balance $ 1,219    
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Total Rate 10.56%    
Spread 6.75%    
PIK Rate 10.56%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (2)    
Amount of Interest, Fees or Dividends Credited to Income 397    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,355    
Gross Additions 398    
Gross Reductions 2    
Ending balance $ 12,751    
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 1.3      
Schedule of Investments [Line Items]      
Total Rate 10.59%    
Spread 6.75%    
PIK Rate 10.59%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (80)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 465    
Gross Reductions 80    
Ending balance $ 385    
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 1.4      
Schedule of Investments [Line Items]      
Total Rate 10.59%    
Spread 6.75%    
PIK Rate 10.59%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (78)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 453    
Gross Reductions 78    
Ending balance $ 375    
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.59% [9],[19],[23] 11.25%  
Spread 6.75% [9],[19],[21],[23] 6.75% 6.75% [11],[17],[24],[25],[26]
PIK Rate [9],[13],[19],[23] 10.59%    
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (207)  
Amount of Interest, Fees or Dividends Credited to Income   408  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 0 [2],[11],[17],[25],[26] 13,155  
Gross Additions   11  
Gross Reductions   621  
Ending balance $ 385 [5],[9],[19],[23] 12,545  
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.59% [9],[19],[23]   10.89% [11],[17],[26]
Spread 6.75% [9],[19],[21],[23]   6.75% [11],[17],[24],[26]
PIK Rate 10.59% [9],[13],[19],[23]   10.89% [11],[14],[17],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[17],[26] $ 12,355    
Ending balance [5],[9],[19],[23] $ 375    
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [9],[19],[23] 10.56%    
Spread 6.75% [9],[19],[21],[23]   6.75% [11],[17],[24],[25],[26]
PIK Rate [9],[13],[19],[23] 10.56%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[17],[25],[26] $ 0    
Ending balance [5],[9],[19],[23] 12,751    
Investment, Identifier [Axis]: RFG AcquireCo, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 12,771    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[9] 12,771    
Investment, Identifier [Axis]: RFG AcquireCo, LLC | Secured Debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[25] (7)    
Ending balance [5],[9],[22] (6)    
Investment, Identifier [Axis]: RFG AcquireCo, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (7)    
Gross Additions 1    
Gross Reductions 0    
Ending balance $ (6)    
Investment, Identifier [Axis]: RFG AcquireCo, LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Total Rate 13.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 267    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 7,932    
Gross Additions 4    
Gross Reductions 0    
Ending balance 7,936    
Investment, Identifier [Axis]: RFG AcquireCo, LLC | Secured Debt 1.3      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 300    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 33,700    
Gross Additions 0    
Gross Reductions 33,700    
Ending balance $ 0    
Investment, Identifier [Axis]: RFG AcquireCo, LLC | Secured Debt 1.4      
Schedule of Investments [Line Items]      
Total Rate 13.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 1,505    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 41,398    
Gross Reductions 0    
Ending balance $ 41,398    
Investment, Identifier [Axis]: RFG AcquireCo, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.50% [9]   12.50% [11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] $ 7,932    
Ending balance [5],[9] $ 7,936    
Investment, Identifier [Axis]: RFG AcquireCo, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 13.50% [9]   12.50% [11]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] $ 33,700    
Ending balance [5],[9] 41,398    
Investment, Identifier [Axis]: Revenue Recovery Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 911    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 1,049    
Gross Additions 911    
Gross Reductions 0    
Ending balance [5],[9] 1,960    
Investment, Identifier [Axis]: Revenue Recovery Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11],[25] (18)    
Gross Additions 1    
Gross Reductions 0    
Ending balance [5],[9],[22] $ (17)    
Investment, Identifier [Axis]: Revenue Recovery Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [9]   13.00% [11]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 221    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 6,640    
Gross Additions 3    
Gross Reductions 0    
Ending balance [5],[9] $ 6,643    
Investment, Identifier [Axis]: Richardson Sales Solutions | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26]     8.86%
Spread 5.00% [19],[20],[21],[22],[23]   5.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 1,353    
Ending balance [5],[19],[20],[22],[23] $ 0    
Investment, Identifier [Axis]: Richardson Sales Solutions | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 8.67% [19],[20],[23]   8.86% [17],[18],[26]
Spread 5.00% [19],[20],[21],[23]   5.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 33,168    
Ending balance [5],[19],[20],[23] $ 32,945    
Investment, Identifier [Axis]: Richardson Sales Solutions | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 8.65% [19],[20],[23]   8.93% [17],[18],[26]
Spread 5.00% [19],[20],[21],[23]   5.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 21,545    
Ending balance [5],[19],[20],[23] 21,404    
Investment, Identifier [Axis]: River Aggregates, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 25 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 9,700 [2],[7],[36] 9,530  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 9,700 [5],[8],[28],[37] 9,530  
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc. | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 [5],[8] $ 0  
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
PIK Rate   10.00%  
Amount of Realized Gain/(Loss) 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 68 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance (62) [2],[7],[16],[25] (39)  
Gross Additions 0 0  
Gross Reductions 6 6  
Ending balance $ (68) [5],[8],[15],[22] $ (45)  
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.50% [8],[15] 12.50% 12.50% [7],[16]
PIK Rate 10.00% [8],[13],[15] 10.00% 10.00% [7],[14],[16]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 149 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 14,029 [2],[7],[16] 14,562  
Gross Additions 0 0  
Gross Reductions 61 210  
Ending balance 13,968 [5],[8],[15] 14,352  
Investment, Identifier [Axis]: Roof Opco, LLC | Secured Debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25] 0    
Ending balance [5],[19],[20],[22] $ 0    
Investment, Identifier [Axis]: Roof Opco, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00% [19],[20]   10.00% [17],[18]
PIK Rate 10.00% [13],[19],[20]   10.00% [14],[17],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] $ 2,444    
Ending balance [5],[19],[20] $ 2,742    
Investment, Identifier [Axis]: Roof Opco, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.00% [19],[20]   10.00% [17],[18]
PIK Rate 10.00% [13],[19],[20]   10.00% [14],[17],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] $ 2,375    
Ending balance [5],[19],[20] 2,656    
Investment, Identifier [Axis]: Royal Cup Inc. | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 3,807    
Ending balance [5],[19],[20] $ 3,807    
Investment, Identifier [Axis]: Royal Cup Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 8.91%    
Spread 5.25% [19],[20],[21],[23]   5.25% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (221)    
Ending balance [5],[19],[20],[23] $ 4,143    
Investment, Identifier [Axis]: Royal Cup Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread 5.25% [19],[20],[21],[22],[23]   5.25% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (83)    
Ending balance [5],[19],[20],[22],[23] $ (79)    
Investment, Identifier [Axis]: Royal Cup Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Spread 5.25% [19],[20],[21],[22],[23]   5.25% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (359)    
Ending balance [5],[19],[20],[22],[23] $ (341)    
Investment, Identifier [Axis]: Royal Cup Inc. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 8.93% [19],[20],[23]   8.98% [17],[18],[26]
Spread 5.25% [19],[20],[21],[23]   5.25% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 52,527    
Ending balance [5],[19],[20],[23] $ 52,596    
Investment, Identifier [Axis]: Rug Doctor, LLC. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.17% [19],[20],[23]   9.17% [17],[18],[26]
Spread 5.50% [19],[20],[21],[23]   5.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 3,721    
Ending balance [5],[19],[20],[23] $ 2,821    
Investment, Identifier [Axis]: Rug Doctor, LLC. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.20% [19],[20],[23]   9.17% [17],[18],[26]
Spread 5.50% [19],[20],[21],[23]   5.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 6,831    
Ending balance [5],[19],[20],[23] 6,727    
Investment, Identifier [Axis]: SI East, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 (1,190)  
Amount of Interest, Fees or Dividends Credited to Income 269 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 17,190 [2],[11],[27] 13,660  
Gross Additions 0 0  
Gross Reductions 0 1,190  
Ending balance $ 17,190 [5],[9],[28] $ 12,470  
Investment, Identifier [Axis]: SI East, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.80% [9] 11.75% 11.80% [11]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (1) (1)  
Amount of Interest, Fees or Dividends Credited to Income 72 72  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,250 [2],[11] 2,250  
Gross Additions 1 1  
Gross Reductions 1 1  
Ending balance $ 2,250 [5],[9] $ 2,250  
Investment, Identifier [Axis]: SI East, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.86% [9],[56] 12.82% 12.85% [11],[57]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (8) (4)  
Amount of Interest, Fees or Dividends Credited to Income 2,159 2,172  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 66,850 [2],[11],[57] 67,661  
Gross Additions 8 4  
Gross Reductions 8 4  
Ending balance 66,850 [5],[9],[56] 67,661  
Investment, Identifier [Axis]: SPAU Holdings, LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 630    
Ending balance [5],[19],[20] $ 630    
Investment, Identifier [Axis]: SPAU Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23],[30] 10.84%    
Spread 7.00% [19],[20],[21],[23],[30]   7.00% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ 0    
Ending balance [5],[19],[20],[23],[30] $ 1,469    
Investment, Identifier [Axis]: SPAU Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.85% [19],[20],[23]   10.82% [17],[18],[26]
Spread 7.00% [19],[20],[21],[23]   7.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 15,409    
Ending balance [5],[19],[20],[23] 15,369    
Investment, Identifier [Axis]: Slick Innovations, LLC | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 430 (550)  
Amount of Interest, Fees or Dividends Credited to Income 0 873  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,160 [2],[11],[27] 2,440  
Gross Additions 430 0  
Gross Reductions 0 550  
Ending balance $ 2,590 [5],[9] 1,890  
Investment, Identifier [Axis]: Slick Innovations, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 14.00% [9]   14.00% [11]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (17)    
Amount of Interest, Fees or Dividends Credited to Income 879    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 24,680    
Gross Additions 17    
Gross Reductions 417    
Ending balance [5],[9] 24,280    
Investment, Identifier [Axis]: Slick Innovations, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   (139)  
Amount of Interest, Fees or Dividends Credited to Income   510  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   16,320  
Gross Additions   0  
Gross Reductions   16,320  
Ending balance   $ 0  
Investment, Identifier [Axis]: Slick Innovations, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate   14.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   282  
Amount of Interest, Fees or Dividends Credited to Income   441  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   25,880  
Gross Reductions   0  
Ending balance   25,880  
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 1,013    
Ending balance [5],[19],[20] $ 1,013    
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.25% [19],[20],[21],[22],[23]   5.25% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ 0    
Ending balance [5],[19],[20],[22],[23] $ 0    
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.02% [19],[20],[23]   9.07% [17],[18],[26]
Spread 5.25% [19],[20],[21],[23]   5.25% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 53,320    
Ending balance [5],[19],[20],[23] $ 53,320    
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.02% [19],[20],[23]   9.07% [17],[18],[26]
Spread 5.25% [19],[20],[21],[23]   5.25% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 10,475    
Ending balance [5],[19],[20],[23] 10,449    
Investment, Identifier [Axis]: Specialized Aviation Holdings, LLC | Preferred Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 338    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 15,000    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[9],[28] $ 15,000    
Investment, Identifier [Axis]: Specialized Aviation Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.00% [9]   13.00% [11]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 825    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 28,362    
Gross Additions 61    
Gross Reductions 5,375    
Ending balance [5],[9] 23,048    
Investment, Identifier [Axis]: Spring Engineering Holdings, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 4,650    
Gross Reductions 0    
Ending balance [5],[8] $ 4,650    
Investment, Identifier [Axis]: Spring Engineering Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [8] 13.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 754    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 23,165    
Gross Reductions 0    
Ending balance [5],[8] 23,165    
Investment, Identifier [Axis]: Student Resource Center, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[11],[17] 0  
Gross Additions   0  
Gross Reductions   0  
Ending balance $ 0 [5],[9],[19] $ 0  
Investment, Identifier [Axis]: Student Resource Center, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 8.50% [9],[19] 8.50% 8.50% [11],[17]
PIK Rate 8.50% [9],[13],[19] 8.50% 8.50% [11],[14],[17]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   (744)  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 780 [2],[11],[17] 1,644  
Gross Additions   0  
Gross Reductions   744  
Ending balance $ 784 [5],[9],[19] $ 900  
Investment, Identifier [Axis]: Student Resource Center, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 8.50%    
PIK Rate 8.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 197    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,438    
Gross Additions 198    
Gross Reductions 0    
Ending balance $ 1,636    
Investment, Identifier [Axis]: Student Resource Center, LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Total Rate 8.50%    
PIK Rate 8.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 4    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 780    
Gross Additions 4    
Gross Reductions 0    
Ending balance $ 784    
Investment, Identifier [Axis]: Student Resource Center, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 8.50% [9],[19] 8.50% 8.50% [11],[16],[17]
PIK Rate 8.50% [9],[13],[19] 8.50% 8.50% [11],[14],[16],[17]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   673  
Amount of Interest, Fees or Dividends Credited to Income   4  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 1,438 [2],[11],[16],[17] 204  
Gross Additions   678  
Gross Reductions   0  
Ending balance 1,636 [5],[9],[19] 882  
Investment, Identifier [Axis]: Superior Rigging & Erecting Co. | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 310 3,870  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 17,500 [2],[11] 10,530  
Gross Additions 310 3,870  
Gross Reductions 0 0  
Ending balance $ 17,810 [5],[9] 14,400  
Investment, Identifier [Axis]: TEC Services, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 5.50% [19],[20],[21],[22],[23]   5.50% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (76)    
Ending balance [5],[19],[20],[22],[23] $ (71)    
Investment, Identifier [Axis]: TEC Services, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Spread 5.50% [19],[20],[21],[22],[23]   5.50% [17],[18],[24],[25],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[25],[26] $ (57)    
Ending balance [5],[19],[20],[22],[23] $ (53)    
Investment, Identifier [Axis]: TEC Services, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.30% [19],[20],[23]   9.27% [17],[18],[26]
Spread 5.50% [19],[20],[21],[23]   5.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 31,903    
Ending balance [5],[19],[20],[23] 31,985    
Investment, Identifier [Axis]: Tectonic Financial, LLC | Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[27] 5,000    
Ending balance [5],[20],[28] 5,000    
Investment, Identifier [Axis]: Tedder Industries, LLC | Preferred Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 [5],[8] 0  
Investment, Identifier [Axis]: Tedder Industries, LLC | Preferred Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 [5],[8] 0  
Investment, Identifier [Axis]: Tedder Industries, LLC | Preferred Member Units 3      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[8] $ 0  
Investment, Identifier [Axis]: Tedder Industries, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.00% [8],[44] 12.00% 12.00% [7],[16],[29]
PIK Rate 12.00% [8],[13],[44] 12.00% 12.00% [7],[14],[16],[29]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (82) (92)  
Amount of Interest, Fees or Dividends Credited to Income 433 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 962 [2],[7],[16],[29] 1,646  
Gross Additions 433 0  
Gross Reductions 82 91  
Ending balance $ 1,313 [5],[8],[44] $ 1,555  
Investment, Identifier [Axis]: Tedder Industries, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00% [8],[15],[44] 12.00% 12.00% [7],[16],[29]
PIK Rate 12.00% [8],[13],[15],[44] 12.00% 12.00% [7],[14],[16],[29]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 2,553 (396)  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,827 [2],[7],[16],[29] 3,603  
Gross Additions 2,553 0  
Gross Reductions 0 396  
Ending balance 5,380 [5],[8],[15],[44] 3,207  
Investment, Identifier [Axis]: Televerde, LLC | Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (2,551) 769  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,822 [2],[7],[27] 4,252  
Gross Additions 0 769  
Gross Reductions 2,551 0  
Ending balance 2,271 [5],[8],[28] 5,021  
Investment, Identifier [Axis]: Televerde, LLC | Preferred Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 1,794 [2],[7] 1,794  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 1,794 [5],[8] 1,794  
Investment, Identifier [Axis]: Tex Tech Tennis, LLC | Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[36] 2,900    
Ending balance [5],[19],[20],[28],[37] 3,100    
Investment, Identifier [Axis]: The Affiliati Network, LLC | Preferred Stock 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   51  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 313 [2],[11] 6,400  
Gross Additions   0  
Gross Reductions   0  
Ending balance 313 [5],[9] 6,400  
Investment, Identifier [Axis]: The Affiliati Network, LLC | Preferred Stock 1.1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 128    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,400    
Gross Additions 0    
Gross Reductions 0    
Ending balance 6,400    
Investment, Identifier [Axis]: The Affiliati Network, LLC | Preferred Stock 1.2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 313    
Gross Additions 0    
Gross Reductions 0    
Ending balance 313    
Investment, Identifier [Axis]: The Affiliati Network, LLC | Preferred Stock 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 6,400 [2],[11],[27] 287  
Gross Additions   26  
Gross Reductions   0  
Ending balance $ 6,400 [5],[9],[28] $ 313  
Investment, Identifier [Axis]: The Affiliati Network, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate   10.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   12  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   394  
Gross Additions   1,281  
Gross Reductions   1,560  
Ending balance   $ 115  
Investment, Identifier [Axis]: The Affiliati Network, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate   10.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   51  
Amount of Interest, Fees or Dividends Credited to Income   133  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   5,053  
Gross Additions   54  
Gross Reductions   0  
Ending balance   5,107  
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Preferred Equity      
Schedule of Investments [Line Items]      
Total Rate 8.00% [19],[20]   8.00% [17],[18]
PIK Rate 8.00% [13],[19],[20]   8.00% [14],[17],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] $ 1,540    
Ending balance [5],[19],[20] $ 1,830    
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.20% [19],[20],[23]   10.17% [17],[18],[26]
Spread 6.50% [19],[20],[21],[23]   6.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 1,439    
Ending balance [5],[19],[20],[23] $ 1,439    
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.20% [19],[20],[23]   10.17% [17],[18],[26]
Spread 6.50% [19],[20],[21],[23]   6.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 33,585    
Ending balance [5],[19],[20],[23] $ 33,499    
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.20% [19],[20],[23]   10.17% [17],[18],[26]
Spread 6.50% [19],[20],[21],[23]   6.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 4,298    
Ending balance [5],[19],[20],[23] $ 4,287    
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 10.20% [19],[20],[23]   10.17% [17],[18],[26]
Spread 6.50% [19],[20],[21],[23]   6.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 4,863    
Ending balance [5],[19],[20],[23] 4,851    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Common Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[36] 696    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[8],[37] 696    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 3,564 0  
Amount of Interest, Fees or Dividends Credited to Income 0 29  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 14,920 [2],[7],[27] 8,570  
Gross Additions 4,930 0  
Gross Reductions 0 0  
Ending balance $ 19,850 [5],[8],[28] 8,570  
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [8] 11.50%    
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 0 [2],[7],[25] (1)  
Gross Additions   0  
Gross Reductions   0  
Ending balance $ 1,600 [5],[8] $ (1)  
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 1.1      
Schedule of Investments [Line Items]      
Total Rate 11.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 5    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 1,600    
Gross Reductions 0    
Ending balance 1,600    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 1.2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (41)    
Amount of Interest, Fees or Dividends Credited to Income 240    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 9,000    
Gross Additions 0    
Gross Reductions 9,000    
Ending balance $ 0    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 1.3      
Schedule of Investments [Line Items]      
Total Rate 13.50%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 219    
Amount of Interest, Fees or Dividends Credited to Income 612    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 31,280    
Gross Reductions 0    
Ending balance $ 31,280    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 1.4      
Schedule of Investments [Line Items]      
Total Rate 9.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (1)    
Amount of Interest, Fees or Dividends Credited to Income 47    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,040    
Gross Additions 1    
Gross Reductions 1    
Ending balance $ 2,040    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 1.5      
Schedule of Investments [Line Items]      
Total Rate 9.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 9    
Amount of Interest, Fees or Dividends Credited to Income 4    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 2,000    
Gross Reductions 0    
Ending balance $ 2,000    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 1.6      
Schedule of Investments [Line Items]      
Total Rate 9.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 2    
Amount of Interest, Fees or Dividends Credited to Income 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 400    
Gross Reductions 0    
Ending balance $ 400    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.50% [8] 13.50% 13.50% [7]
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   274  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 9,000 [2],[7] 7,855  
Gross Additions   7  
Gross Reductions   0  
Ending balance $ 31,280 [5],[8] 7,862  
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.00% [8]   9.00% [7]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] $ 2,040    
Ending balance [5],[8] $ 2,040    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate [8] 9.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[8] $ 2,000    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 5      
Schedule of Investments [Line Items]      
Total Rate [8] 9.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[8] $ 400    
Investment, Identifier [Axis]: Trinity Medical Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] 22,500    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[8] $ 22,500    
Investment, Identifier [Axis]: Trinity Medical Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.00%    
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 1,931    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 57,944    
Gross Additions 30    
Gross Reductions 0    
Ending balance 57,974    
Investment, Identifier [Axis]: Trinity Medical Holdings, LLC | Secured Debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7],[25] 0    
Ending balance [5],[8],[22] $ 0    
Investment, Identifier [Axis]: Trinity Medical Holdings, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [8]   13.00% [7]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] $ 57,944    
Ending balance [5],[8] $ 57,974    
Investment, Identifier [Axis]: U.S. TelePacific Corp. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 14.78% [12],[20],[23]   12.32% [10],[16],[18],[26]
Spread 11.00% [12],[20],[21],[23]   8.15% [10],[16],[18],[24],[26]
PIK Rate 10.00% [12],[13],[20],[23]   7.00% [10],[14],[16],[18],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[16],[18],[26] $ 3,998    
Ending balance [5],[12],[20],[23] $ 658    
Investment, Identifier [Axis]: U.S. TelePacific Corp. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [12],[15],[20],[23] 13.75%    
Spread [12],[15],[20],[21],[23] 7.00%    
PIK Rate [12],[13],[15],[20],[23] 7.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[16],[18] $ 0    
Ending balance [5],[12],[15],[20],[23] 4,038    
Investment, Identifier [Axis]: U.S. TelePacific Corp. | Secured Debt 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[12],[15],[20] 0    
Investment, Identifier [Axis]: UBM AcquireCo LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18] 8,000    
Ending balance [5],[20],[28] 8,000    
Investment, Identifier [Axis]: UBM AcquireCo LLC | Secured Debt 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18],[25] (38)    
Ending balance [5],[20],[22] $ (34)    
Investment, Identifier [Axis]: UBM AcquireCo LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.00% [20]   10.00% [18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[18] $ 42,379    
Ending balance [5],[20] 42,400    
Investment, Identifier [Axis]: UPS Intermediate, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 1,480    
Ending balance [5],[19],[20] 1,630    
Investment, Identifier [Axis]: UPS Intermediate, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26]     9.97%
Spread [17],[18],[24],[26]     6.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 42,622    
Investment, Identifier [Axis]: UPS Intermediate, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 10.17%    
Spread [19],[20],[21],[23] 6.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[23] $ 13,131    
Investment, Identifier [Axis]: UPS Intermediate, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 10.17%    
Spread [19],[20],[21],[23] 6.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[23] $ 3,540    
Investment, Identifier [Axis]: UPS Intermediate, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 10.17%    
Spread [19],[20],[21],[23] 6.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[23] $ 42,784    
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[10],[11] 0  
Gross Additions   0  
Gross Reductions   0  
Ending balance $ 0 [5],[9],[12] $ 0  
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Stock 1      
Schedule of Investments [Line Items]      
Total Rate 20.00% [9],[12]   20.00% [10],[11]
PIK Rate 20.00% [9],[12],[13] 20.00% 20.00% [10],[11],[14]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 104  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 9,388 [2],[10],[11] 3,182  
Gross Additions 0 1,632  
Gross Reductions 0 4,814  
Ending balance $ 9,388 [5],[9],[12] $ 0  
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Stock 2      
Schedule of Investments [Line Items]      
Total Rate 19.00% [9],[12] 20.00% 19.00% [10],[11]
PIK Rate 19.00% [9],[12],[13] 20.00% 19.00% [10],[11],[14]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[10],[11] 4,272  
Gross Additions 0 5,904  
Gross Reductions 0 0  
Ending balance $ 0 [5],[9],[12] $ 10,176  
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Stock 3      
Schedule of Investments [Line Items]      
Total Rate 13.50% [9],[12] 19.00% 13.50% [10],[11]
PIK Rate 13.50% [9],[12],[13] 19.00% 13.50% [10],[11],[14]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[10],[11] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 [5],[9],[12] $ 0  
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Preferred Stock 4      
Schedule of Investments [Line Items]      
Total Rate   13.50%  
PIK Rate   13.50%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   $ 0  
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Secured Convertible Debt 1      
Schedule of Investments [Line Items]      
PIK Rate   15.00%  
Amount of Realized Gain/(Loss)   $ 3,762  
Amount of Unrealized Gain/(Loss)   (2,384)  
Amount of Interest, Fees or Dividends Credited to Income   41  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   5,642  
Gross Additions   504  
Gross Reductions   6,146  
Ending balance   $ 0  
Investment, Identifier [Axis]: UniTek Global Services, Inc. | Secured Convertible Debt 2      
Schedule of Investments [Line Items]      
PIK Rate   15.00%  
Amount of Realized Gain/(Loss)   $ 1,743  
Amount of Unrealized Gain/(Loss)   (1,155)  
Amount of Interest, Fees or Dividends Credited to Income   21  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   2,662  
Gross Additions   236  
Gross Reductions   2,898  
Ending balance   0  
Investment, Identifier [Axis]: UnionRock Energy Fund II, LP | LP Interests      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,164 [2],[11],[40],[45],[46] 4,732  
Gross Additions 205 0  
Gross Reductions 134 168  
Ending balance 4,235 [5],[9],[42],[47],[48] 4,564  
Investment, Identifier [Axis]: UnionRock Energy Fund III, LP | LP Interests      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 5,165 [2],[11],[27],[40],[45],[46] 5,612  
Gross Additions 372 0  
Gross Reductions 130 363  
Ending balance 5,407 [5],[9],[28],[42],[47],[48] $ 5,249  
Investment, Identifier [Axis]: Urgent DSO LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Total Rate   9.00%  
PIK Rate   9.00%  
Amount of Realized Gain/(Loss) 0 $ 0  
Amount of Unrealized Gain/(Loss) (1,796) 0  
Amount of Interest, Fees or Dividends Credited to Income 0 95  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 4,356 [2],[11],[27] 4,320  
Gross Additions 0 95  
Gross Reductions 1,796 0  
Ending balance $ 2,560 [5],[9],[28] $ 4,415  
Investment, Identifier [Axis]: Urgent DSO LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.50% [9] 13.50% 13.50% [11]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) (191) 0  
Amount of Interest, Fees or Dividends Credited to Income 301 301  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 8,672 [2],[11] 8,727  
Gross Additions 5 4  
Gross Reductions 191 0  
Ending balance 8,486 [5],[9] 8,731  
Investment, Identifier [Axis]: UserZoom Technologies, Inc. | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate [17],[18],[26]     11.63%
Spread [17],[18],[24],[26]     7.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 4,000    
Investment, Identifier [Axis]: UserZoom Technologies, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 11.40%    
Spread [19],[20],[21],[23] 7.75%    
PIK Rate [13],[19],[20],[23] 1.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[23] $ 323    
Investment, Identifier [Axis]: UserZoom Technologies, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 11.42%    
Spread [19],[20],[21],[23] 7.75%    
PIK Rate [13],[19],[20],[23] 1.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[23] $ 4,016    
Investment, Identifier [Axis]: VORTEQ Coil Finishers, LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[27] 3,610    
Ending balance [5],[19],[20],[28] 4,030    
Investment, Identifier [Axis]: VVS Holdco LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 99  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 12,240 [2],[7],[27],[36] 12,240  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 12,240 [5],[8],[37] $ 12,240  
Investment, Identifier [Axis]: VVS Holdco LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Spread 6.00% [8],[21],[22],[23] 6.00% 6.00% [7],[24],[25],[26]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 4 4  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7],[25],[26] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 0 [5],[8],[22],[23] $ 0  
Investment, Identifier [Axis]: VVS Holdco LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.50% [8] 11.50% 11.50% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 702 754  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 23,956 [2],[7] 25,661  
Gross Additions 12 13  
Gross Reductions 0 0  
Ending balance 23,968 [5],[8] 25,674  
Investment, Identifier [Axis]: Victory Energy Operations, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 260 0  
Amount of Interest, Fees or Dividends Credited to Income 108 116  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 23,380 [2],[7] 22,686  
Gross Additions 260 0  
Gross Reductions 0 0  
Ending balance $ 23,640 [5],[8] 22,686  
Investment, Identifier [Axis]: Victory Energy Operations, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 13.00% [8]   13.00% [7]
Amount of Realized Gain/(Loss) $ 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 56 6  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 836 [2],[7] (33)  
Gross Additions 1,725 2  
Gross Reductions 431 0  
Ending balance $ 2,130 [5],[8] $ (31)  
Investment, Identifier [Axis]: Victory Energy Operations, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 13.00% [8] 13.00% 13.00% [7]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 1,592 1,592  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 47,889 [2],[7] 47,792  
Gross Additions 24 24  
Gross Reductions 0 0  
Ending balance $ 47,913 [5],[8] 47,816  
Investment, Identifier [Axis]: Vitesse Systems | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 10.95% [19],[20],[30]   10.98% [17],[18],[31]
Spread 7.00% [19],[20],[21],[30]   7.00% [17],[18],[24],[31]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[31] $ 7,727    
Ending balance [5],[19],[20],[30] $ 7,727    
Investment, Identifier [Axis]: Vitesse Systems | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 10.92% [19],[20],[23]   10.93% [17],[18],[26]
Spread 7.00% [19],[20],[21],[23]   7.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 41,650    
Ending balance [5],[19],[20],[23] $ 3,883    
Investment, Identifier [Axis]: Vitesse Systems | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate [19],[20],[23] 10.96%    
Spread [19],[20],[21],[23] 7.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ending balance [5],[19],[20],[23] $ 41,544    
Investment, Identifier [Axis]: Volusion, LLC | Common Stock      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 0 [5],[8] 0  
Investment, Identifier [Axis]: Volusion, LLC | Preferred Member Units 1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,910 [2],[7] 0  
Gross Additions   0  
Gross Reductions   0  
Ending balance 2,040 [5],[8] 0  
Investment, Identifier [Axis]: Volusion, LLC | Preferred Member Units 1.1      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0    
Gross Additions 0    
Gross Reductions 0    
Ending balance 0    
Investment, Identifier [Axis]: Volusion, LLC | Preferred Member Units 1.2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) (563)    
Amount of Interest, Fees or Dividends Credited to Income 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,910    
Gross Additions 0    
Gross Reductions 870    
Ending balance 2,040    
Investment, Identifier [Axis]: Volusion, LLC | Preferred Member Units 2      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   22  
Amount of Unrealized Gain/(Loss)   (1,528)  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 7,003  
Gross Additions   21  
Gross Reductions   1,854  
Ending balance 0 [5],[8] 5,170  
Investment, Identifier [Axis]: Volusion, LLC | Preferred Member Units 3      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 [2],[7] 0  
Gross Additions   0  
Gross Reductions   0  
Ending balance $ 0 [5],[8] $ 0  
Investment, Identifier [Axis]: Volusion, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 10.00% [8],[44] 10.00% 10.00% [7],[29]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 52 52  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 2,100 [2],[7],[29] 2,100  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance 2,100 [5],[8],[44] 2,100  
Investment, Identifier [Axis]: Wash & Wax Systems LLC | Common Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] 1,520    
Ending balance [5],[19],[20] $ 1,370    
Investment, Identifier [Axis]: Wash & Wax Systems LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.19% [19],[20],[23],[30]   9.28% [17],[18],[26],[31]
Spread 5.50% [19],[20],[21],[23],[30]   5.50% [17],[18],[24],[26],[31]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[31] $ 322    
Ending balance [5],[19],[20],[23],[30] $ 322    
Investment, Identifier [Axis]: Wash & Wax Systems LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.17% [19],[20],[23]   9.34% [17],[18],[26]
Spread 5.50% [19],[20],[21],[23]   5.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 7,546    
Ending balance [5],[19],[20],[23] $ 7,498    
Investment, Identifier [Axis]: Wash & Wax Systems LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 12.00% [19],[20]   12.00% [17],[18]
PIK Rate 12.00% [13],[19],[20]   12.00% [14],[17],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18] $ 5,353    
Ending balance [5],[19],[20] $ 5,392    
Investment, Identifier [Axis]: Watterson Brands, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.00% [15],[19],[20]   12.00% [16],[17],[18]
PIK Rate 4.00% [13],[15],[19],[20]   4.00% [14],[16],[17],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[16],[17],[18] $ 1,595    
Ending balance [5],[15],[19],[20] $ 1,343    
Investment, Identifier [Axis]: Watterson Brands, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00% [15],[19],[20]   12.00% [16],[17],[18]
PIK Rate 4.00% [13],[15],[19],[20]   4.00% [14],[16],[17],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[16],[17],[18] $ 275    
Ending balance [5],[15],[19],[20] $ 231    
Investment, Identifier [Axis]: Watterson Brands, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 12.00% [15],[19],[20]   12.00% [16],[17],[18]
PIK Rate 4.00% [13],[15],[19],[20]   4.00% [14],[16],[17],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[16],[17],[18] $ 11,314    
Ending balance [5],[15],[19],[20] $ 9,499    
Investment, Identifier [Axis]: Watterson Brands, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 12.00% [15],[19],[20]   12.00% [16],[17],[18]
PIK Rate 4.00% [13],[15],[19],[20]   4.00% [14],[16],[17],[18]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[16],[17],[18] $ 9,049    
Ending balance [5],[15],[19],[20] 7,598    
Investment, Identifier [Axis]: Wildcats Topco LLC | Common Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0    
Amount of Unrealized Gain/(Loss) 70    
Amount of Interest, Fees or Dividends Credited to Income 135    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[11] 22,760    
Gross Additions 70    
Gross Reductions 0    
Ending balance [5],[9] $ 22,830    
Investment, Identifier [Axis]: Winter Services LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.43% [19],[20],[23],[30]   11.49% [17],[18],[26],[31]
Spread 7.50% [19],[20],[21],[23],[30]   7.50% [17],[18],[24],[26],[31]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[31] $ 4,000    
Ending balance [5],[19],[20],[23],[30] $ 2,933    
Investment, Identifier [Axis]: Winter Services LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 11.42% [19],[20],[23]   11.75% [17],[18],[26]
Spread 7.50% [19],[20],[21],[23]   7.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 1,874    
Ending balance [5],[19],[20],[23] $ 1,874    
Investment, Identifier [Axis]: Winter Services LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 10.42% [19],[20],[23]   10.75% [17],[18],[26]
Spread 6.50% [19],[20],[21],[23]   6.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 7,240    
Ending balance [5],[19],[20],[23] $ 7,240    
Investment, Identifier [Axis]: Winter Services LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 12.42% [19],[20],[23]   12.75% [17],[18],[26]
Spread 8.50% [19],[20],[21],[23]   8.50% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 7,240    
Ending balance [5],[19],[20],[23] 7,240    
Investment, Identifier [Axis]: World Micro Holdings, LLC | Preferred Equity      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 0 22  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 3,845 [2],[11],[27] 3,845  
Gross Additions 0 0  
Gross Reductions 0 0  
Ending balance $ 3,845 [5],[9],[28] $ 3,845  
Investment, Identifier [Axis]: World Micro Holdings, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 13.00% [9] 11.00% 12.00% [11]
Amount of Realized Gain/(Loss) $ 0 $ 0  
Amount of Unrealized Gain/(Loss) 0 0  
Amount of Interest, Fees or Dividends Credited to Income 326 299  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 9,848 [2],[11] 10,702  
Gross Additions 5 11  
Gross Reductions 0 879  
Ending balance $ 9,853 [5],[9] 9,834  
Investment, Identifier [Axis]: Xenon Arc, Inc. | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 9.54% [19],[20],[23]   9.54% [17],[18],[26]
Spread 5.75% [19],[20],[21],[23]   5.75% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 23,571    
Ending balance [5],[19],[20],[23] $ 23,510    
Investment, Identifier [Axis]: Xenon Arc, Inc. | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.52% [19],[20],[23]   9.72% [17],[18],[26]
Spread 5.75% [19],[20],[21],[23]   5.75% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 37,056    
Ending balance [5],[19],[20],[23] $ 36,960    
Investment, Identifier [Axis]: Xenon Arc, Inc. | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.55% [19],[20],[23]   9.52% [17],[18],[26]
Spread 5.75% [19],[20],[21],[23]   5.75% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 10,552    
Ending balance [5],[19],[20],[23] $ 10,525    
Investment, Identifier [Axis]: YS Garments, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate 11.26% [12],[20],[23],[51]   11.48% [10],[18],[26],[52]
Spread 7.50% [12],[20],[21],[23],[51]   7.50% [10],[18],[24],[26],[52]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[10],[18],[26],[52] $ 8,893    
Ending balance [5],[12],[20],[23],[51] $ 9,007    
Investment, Identifier [Axis]: ZRG Partners, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 11.75% [19],[20],[23]   11.75% [17],[18],[26]
Spread 5.00% [19],[20],[21],[23]   5.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 6,601    
Ending balance [5],[19],[20],[23] $ 8,685    
Investment, Identifier [Axis]: ZRG Partners, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 9.69% [19],[20],[23],[51]   9.69% [17],[18],[26],[52]
Spread 6.00% [19],[20],[21],[23],[51]   6.00% [17],[18],[24],[26],[52]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26],[52] $ 11,781    
Ending balance [5],[19],[20],[23],[51] $ 15,920    
Investment, Identifier [Axis]: ZRG Partners, LLC | Secured Debt 3      
Schedule of Investments [Line Items]      
Total Rate 9.60% [19],[20],[23]   9.60% [17],[18],[26]
Spread 6.00% [19],[20],[21],[23]   6.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 6,502    
Ending balance [5],[19],[20],[23] $ 6,485    
Investment, Identifier [Axis]: ZRG Partners, LLC | Secured Debt 4      
Schedule of Investments [Line Items]      
Total Rate 9.69% [19],[20],[23]   9.73% [17],[18],[26]
Spread 6.00% [19],[20],[21],[23]   6.00% [17],[18],[24],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[17],[18],[26] $ 46,518    
Ending balance [5],[19],[20],[23] 46,385    
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC | Preferred Member Units      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss) 0 0  
Amount of Unrealized Gain/(Loss) (50) (160)  
Amount of Interest, Fees or Dividends Credited to Income 0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 50 [2],[7] 320  
Gross Additions 0 0  
Gross Reductions 50 160  
Ending balance $ 0 [5],[8] $ 160  
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC | Secured Debt      
Schedule of Investments [Line Items]      
Total Rate   12.00%  
Amount of Realized Gain/(Loss)   $ 0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   54  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   1,750  
Gross Additions   0  
Gross Reductions   0  
Ending balance   1,750  
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC | Secured Debt 1      
Schedule of Investments [Line Items]      
Total Rate 12.00% [8]   12.00% [7]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) 0    
Amount of Interest, Fees or Dividends Credited to Income 5    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] 150    
Gross Additions 0    
Gross Reductions 0    
Ending balance [5],[8] $ 150    
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC | Secured Debt 2      
Schedule of Investments [Line Items]      
Total Rate 12.00% [8]   12.00% [7]
Amount of Realized Gain/(Loss) $ 0    
Amount of Unrealized Gain/(Loss) (54)    
Amount of Interest, Fees or Dividends Credited to Income 52    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance [2],[7] 1,687    
Gross Additions 0    
Gross Reductions 54    
Ending balance [5],[8] $ 1,633    
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC | Warrants      
Schedule of Investments [Line Items]      
Amount of Realized Gain/(Loss)   0  
Amount of Unrealized Gain/(Loss)   0  
Amount of Interest, Fees or Dividends Credited to Income   0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance   0  
Gross Additions   0  
Gross Reductions   0  
Ending balance   $ 0  
[1] All portfolio company headquarters are based in the U.S., unless otherwise noted.
[2] Investment Fair Value was determined using significant unobservable inputs, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for further discussion. Negative fair value is the result of the capitalized discount on the loan or the unfunded commitment being valued below par.
[3] All investments are LMM portfolio investments, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of LMM portfolio investments. All of the Company’s investments, unless otherwise noted, are encumbered either as security for the Corporate Facility or SPV Facility or in support of the debentures guaranteed by the SBA and issued by the Funds.
[4] All portfolio company headquarters are based in the U.S., unless otherwise noted.
[5] Investment Fair Value was determined using significant unobservable inputs, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments —Portfolio Composition for further discussion. Negative fair value is the result of the capitalized discount on the loan or the unfunded commitment being valued below par.
[6] All investments are LMM (as defined below) portfolio investments, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of LMM portfolio investments. All of the Company’s investments, unless otherwise noted, are encumbered either as security for
the Corporate Facility or SPV Facility (each as defined below) or in support of the debentures guaranteed by the SBA (as defined below) and issued by the Funds (as defined below).
[7] “Control” investments are defined by the 1940 Act as investments in which more than 25% of the voting securities are owned or where the ability to nominate greater than 50% of the board representation is maintained.
[8] “Control” investments are defined by the 1940 Act as investments in which more than 25% of the voting securities are owned or where the ability to nominate greater than 50% of the board representation is maintained.
[9] “Affiliate” investments are defined by the 1940 Act as investments in which between 5% and 25% (inclusive) of the voting securities are owned and the investments are not classified as Control investments.
[10] Middle Market portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Middle Market portfolio investments.
[11] “Affiliate” investments are defined by the 1940 Act as investments in which between 5% and 25% (inclusive) of the voting securities are owned and the investments are not classified as Control investments.
[12] Middle Market (as defined below) portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Middle Market portfolio investments.
[13] Investments may have a portion, or all, of their income received from Paid-in-Kind (“PIK”) interest or dividends. PIK interest income and cumulative dividend income represent income not paid currently in cash. The difference between the Total Rate and PIK Rate represents the cash rate as of March 31, 2026.
[14] Investments may have a portion, or all, of their income received from PIK interest or dividends. PIK interest income and cumulative dividend income represent income not paid currently in cash. The difference between the Total Rate and PIK Rate represents the cash rate as of December 31, 2025.
[15] Non-accrual or non-income producing debt investment.
[16] Non-accrual or non-income producing debt investment.
[17] Private Loan portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Private Loan portfolio investments.
[18] “Non-Control/Non-Affiliate” investments are defined by the 1940 Act as investments that are neither Control investments nor Affiliate investments.
[19] Private Loan (as defined below) portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Private Loan portfolio investments.
[20] “Non-Control/Non-Affiliate” investments are defined by the 1940 Act as investments that are neither Control investments nor Affiliate investments.
[21] A majority of the variable rate loans in the Investment Portfolio (as defined below) bear interest at a rate that may be determined by reference to either SOFR (“SF”) or an alternate base rate (commonly based on the federal funds rate or the Prime rate (“P”)), which typically resets every one, three, or six months at the borrower’s option. SOFR based contracts may include a credit spread adjustment (the “Adjustment”) that is charged in addition to the stated spread. The Adjustment is applied when the SOFR, plus the Adjustment, exceeds the stated floor rate, as applicable. As of March 31, 2026, SOFR based contracts in the portfolio had Adjustments ranging from 0.10% to 0.26%.
[22] The position is unfunded and no interest income is being earned as of March 31, 2026. The position may earn a nominal unused facility fee on committed amounts.
[23] Index based floating interest rate is subject to contractual minimum interest rate. As noted in this schedule, 96% of the loans (based on the par amount) contain Term Secured Overnight Financing Rate (“SOFR”) floors which range between 0.50% and 5.25%, with a weighted-average floor of 1.29%.
[24] A majority of the variable rate loans in the Investment Portfolio bear interest at a rate that may be determined by reference to either SOFR (“SF”) or an alternate base rate (commonly based on the federal funds rate or the Prime rate (“P”)), which typically resets every one, three, or six months at the borrower’s option. SOFR based contracts may include a credit spread adjustment (the “Adjustment”) that is charged in addition to the stated spread. The Adjustment is applied when the SOFR, plus the Adjustment, exceeds the stated floor rate, as applicable. As of December 31, 2025, SOFR based contracts in the portfolio had Adjustments ranging from 0.10% to 0.26%.
[25] The position is unfunded and no interest income is being earned as of December 31, 2025. The position may earn a nominal unused facility fee on committed amounts.
[26] Index based floating interest rate is subject to contractual minimum interest rate. As noted in this schedule, 96% of the loans (based on the par amount) contain Term SOFR floors which range between 0.50% and 5.25%, with a weighted-average floor of 1.31%.
[27] Income producing through dividends or distributions.
[28] Income producing through dividends or distributions.
[29] Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
[30] Revolving line of credit facility permits the borrower to make an interest rate election regarding the base rate on each draw under the facility. The rate presented represents a weighted-average rate for borrowings under the facility, as of March 31, 2026.
[31] Revolving line of credit facility permits the borrower to make an interest rate election regarding the base rate on each draw under the facility. The rate presented represents a weighted-average rate for borrowings under the facility, as of December 31, 2025.
[32]
(33)Index based floating interest rate is subject to contractual maximum base rate of 3.00%.
[33] Index based floating interest rate is subject to contractual maximum base rate of 3.00%.
[34] Warrants are presented in equivalent shares/units with a strike price of $0.01 per share/unit.
[35]
(27)Warrants are presented in equivalent shares/units with a strike price of $0.01 per share/unit.
[36] Shares/Units represent ownership in a related real estate or holding entity.
[37]
(29)Shares/Units represent ownership in a related real estate or holding entity.
[38] The Company has entered into an intercreditor agreement that entitles the Company to the “last out” tranche of the first lien secured loans, whereby the “first out” tranche will receive priority as to the “last out” tranche with respect to payments of principal, interest, and any other amounts due thereunder. Therefore, the Company receives a higher interest rate than the contractual stated interest rate of SOFR+7.50% (Floor 1.50%) per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.
[39] The Company has entered into an intercreditor agreement that entitles the Company to the “last out” tranche of the first lien secured loans, whereby the “first out” tranche will receive priority as to the “last out” tranche with respect to payments of principal, interest, and any other amounts due thereunder. Therefore, the Company receives a higher interest rate than the contractual stated interest rate of SOFR+6.50% (Floor 1.50%) per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.
[40] Investment is not a qualifying asset as defined under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets.
[41] Portfolio company headquarters are located outside of the U.S.
[42] Investment is not a qualifying asset as defined under Section 55(a) of the 1940 Act (as defined below). Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets.
[43] Portfolio company headquarters are located outside of the U.S.
[44] Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
[45] Investment is not unitized. Presentation is made in percent of fully diluted ownership unless otherwise indicated.
[46] Other Portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Other Portfolio investments.
[47]
(30)Investment is not unitized. Presentation is made in percent of fully diluted ownership unless otherwise indicated.
[48] Other Portfolio (as defined below) investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Other Portfolio investments.
[49]
(34)Index based floating interest rate is subject to contractual maximum base rate of 4.00%.
[50] Index based floating interest rate is subject to contractual maximum base rate of 4.00%.
[51] Each new draw or funding on the facility has a different floating rate reset date. The rate presented represents a weighted-average rate for borrowings under the facility, as of March 31, 2026.
[52] Each new draw or funding on the facility has a different floating rate reset date. The rate presented represents a weighted-average rate for borrowings under the facility, as of December 31, 2025.
[53] Investment is accruing income at the fixed cash rate of 2.50% as of December 31, 2025.
[54] External Investment Manager. Investment is not encumbered as security for the Credit Facilities or in support of the SBA-guaranteed debentures issued by the Funds.
[55] External Investment Manager (as defined below). Investment is not encumbered as security for the Credit Facilities (as defined below) or in support of the SBA-guaranteed debentures issued by the Funds.
[56] The Company has entered into an intercreditor agreement that entitles the Company to the “last out” tranche of the first lien secured loans, whereby the “first out” tranche will receive priority as to the “last out” tranche with respect to payments of principal, interest, and any other amounts due thereunder. Therefore, the Company receives a higher interest rate than the contractual stated interest rate of 11.80% per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.
[57] The Company has entered into an intercreditor agreement that entitles the Company to the “last out” tranche of the first lien secured loans, whereby the “first out” tranche will receive priority as to the “last out” tranche with respect to payments of principal, interest, and any other amounts due thereunder. Therefore, the Company receives a higher interest rate than the contractual stated interest rate of 11.80% per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.