v3.25.1
Consolidated Schedule of Investments In and Advances to Affiliates (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Mar. 31, 2023
Schedule of Investments [Line Items]        
PIK Rate 12.95%      
Amount of Realized Gain/(Loss) $ (21,066) $ (1,884)    
Amount of Unrealized Gain/(Loss) 18,783 (1,133)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [1] 1,177,507      
Ending balance [2] 1,260,853      
Control investments        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 9 10    
Amount of Unrealized Gain/(Loss) (833) 422    
Amount of Interest, Fees or Dividends Credited to Income 1,442 811    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 69,878 [1],[3] 53,644    
Gross Additions 383 458    
Gross Reductions 988 458    
Ending balance 69,273 [2],[4] 53,644    
Affiliate investments        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 0 0    
Amount of Unrealized Gain/(Loss) 2,836 (19)    
Amount of Interest, Fees or Dividends Credited to Income 9,335 6,929    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 351,360 [1],[5] 291,279    
Gross Additions 23,965 12,001    
Gross Reductions 15,979 13,951    
Ending balance $ 367,260 [2],[6] $ 289,329    
Investment, Identifier [Axis]: Fidelity Government Portfolio Fund Class III        
Schedule of Investments [Line Items]        
Total Rate 3.98%   4.13%  
Investment, Identifier [Axis]: AAC Holdings, Inc., Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 0      
Ending balance 0      
Investment, Identifier [Axis]: AAC Holdings, Inc., Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 2,931      
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate     18.00%  
PIK Rate 10.00% [7]   18.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 209      
Ending balance [7] $ 1,070      
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate     18.00%  
PIK Rate 10.00% [7]   18.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 5,975      
Ending balance [7] 1,070      
Investment, Identifier [Axis]: AAC Holdings, Inc., Warrants        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [8] 0      
Ending balance [9] 0      
Investment, Identifier [Axis]: AMEREQUIP LLC., Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10],[11] 30      
Ending balance [12],[13] 20      
Investment, Identifier [Axis]: ATS Operating, LLC, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 120      
Ending balance $ 120      
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 10.56% [14],[15]   10.85% [16]  
Spread 6.00% [14],[15]   6.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 50      
Ending balance [14],[15] $ 125      
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 9.57% [15]   9.85% [16]  
Spread 5.00% [15]   5.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 925      
Ending balance [15] $ 925      
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.57% [15]   11.85% [16]  
Spread 7.00% [15]   7.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 925      
Ending balance [15] 925      
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] 124      
Ending balance [13] $ 157      
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 7.25% [15],[17]   7.25% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (12)      
Ending balance [15],[17] $ (11)      
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.70% [15]   11.73% [16]  
Spread 7.25% [15]   7.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 3,343      
Ending balance [15] $ 3,322      
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.00% [15],[19]   11.00% [16],[20]  
Spread 7.00% [15],[19]   7.00% [16],[20]  
PIK Rate 1.00% [15],[19]   1.00% [16],[20]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[20] $ 928      
Ending balance [15],[19] $ 928      
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.00% [15],[19]   11.00% [16],[20]  
Spread 7.00% [15],[19]   7.00% [16],[20]  
PIK Rate 1.00% [15],[19]   1.00% [16],[20]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[20] $ 2,209      
Ending balance [15],[19] $ 2,134      
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 5.00% [15],[17]   5.00% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (6)      
Ending balance [15],[17] $ (6)      
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.50% [15]   12.50% [16]  
Spread 5.00% [15]   5.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 7,703      
Ending balance [15] $ 7,385      
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [15] 12.95%      
Spread [15] 8.50%      
PIK Rate [15] 12.95%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 2,111      
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.95%      
Spread 8.50%      
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 2,111      
Gross Reductions 0      
Ending balance 2,111      
Investment, Identifier [Axis]: American Nuts, 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 2,556      
Gross Reductions 0      
Ending balance 2,556      
Investment, Identifier [Axis]: American Nuts, LLC, Roaster, Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 2,556      
Investment, Identifier [Axis]: American Nuts, LLC, Roaster, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.95% [15]   16.49% [16],[21]  
Spread 8.50% [15]   11.75% [16],[21]  
PIK Rate 12.95% [15]   16.49% [16],[21]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[21] $ 2,621      
Ending balance [15] $ 2,111      
Investment, Identifier [Axis]: American Nuts, LLC, Roaster,Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate     14.49%  
Spread 9.75%      
PIK Rate     14.49%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 4,480      
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.95%      
Spread 8.50%      
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 2,111      
Gross Reductions 0      
Ending balance 2,111      
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [21],[22] 59      
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [21],[22] 282      
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 1,290      
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [17] $ 0      
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 17.50%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 1,000      
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,330      
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 1.1        
Schedule of Investments [Line Items]        
Total Rate   14.13%    
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]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 2.1        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 0 0    
Amount of Unrealized Gain/(Loss) (40) 180    
Amount of Interest, Fees or Dividends Credited to Income 0 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,330 1,210    
Gross Additions 0 180    
Gross Reductions 40 0    
Ending balance 1,290 $ 1,390    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate   15.38%    
Spread   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 0 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0 [18] 54    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 0 $ 54    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 17.50% 15.38% 13.75%  
Spread   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 45 44    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,012 1,020    
Gross Additions 1 5    
Gross Reductions 13 18    
Ending balance 1,000 1,007    
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 [8] 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance 0 [9] 0    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC,, Preferred Member Units 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 0      
Investment, Identifier [Axis]: Ansira Partners II, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 6.75% [15],[17]   6.75% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (45)      
Ending balance [15],[17] $ (42)      
Investment, Identifier [Axis]: Ansira Partners II, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.07% [15]   11.25% [16]  
Spread 6.75% [15]   6.75% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 17,375      
Ending balance [15] 17,398      
Investment, Identifier [Axis]: ArborWorks, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Ending balance 0      
Investment, Identifier [Axis]: ArborWorks, LLC, Preferred Equity 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 6,667      
Ending balance 7,349      
Investment, Identifier [Axis]: ArborWorks, LLC, Preferred Equity 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Ending balance $ 0      
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 15.00%   15.00%  
PIK Rate 15.00%   15.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 1,061      
Ending balance $ 1,101      
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.92% [15]   11.08% [16]  
Spread 6.50% [15]   6.50% [16]  
PIK Rate 10.92% [15]   11.08% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 4,278      
Ending balance [15] 4,396      
Investment, Identifier [Axis]: Archer Systems, LLC, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10] 110      
Ending balance [12],[13] 100      
Investment, Identifier [Axis]: B-O-F Corporation, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 180      
Investment, Identifier [Axis]: B-O-F Corporation, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [15] 10.08%      
Spread [15] 5.75%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 46      
Investment, Identifier [Axis]: B-O-F Corporation, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [15] 9.04%      
Spread [15] 4.75%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 2,949      
Investment, Identifier [Axis]: B-O-F Corporation, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate [15] 11.04%      
Spread [15] 6.75%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 2,949      
Investment, Identifier [Axis]: BDB Holdings, LLC, , Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 12,610      
Investment, Identifier [Axis]: BDB 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 12,610      
Gross Additions 0      
Gross Reductions 0      
Ending balance $ 12,610      
Investment, Identifier [Axis]: BDB Holdings, 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 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Gross Additions 280      
Gross Reductions 0      
Ending balance 280      
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,550      
Ending balance $ 1,750      
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 10.17% [14],[15]   10.68% [16],[23]  
Spread 5.75% [14],[15]   6.25% [16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[23] $ 514      
Ending balance [14],[15] $ 385      
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Spread 5.75% [15],[17]   6.25% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (10)      
Ending balance [15],[17] $ (10)      
Investment, Identifier [Axis]: BP Loenbro Holdings Inc., Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.14% [15]   10.92% [16]  
Spread 5.75% [15]   6.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 11,217      
Ending balance [15] 11,145      
Investment, Identifier [Axis]: Barfly Ventures, LLC - Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [10] 1,920      
Investment, Identifier [Axis]: Barfly Ventures, LLC, Member Units        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 0 0    
Amount of Unrealized Gain/(Loss) (33) 160    
Amount of Interest, Fees or Dividends Credited to Income 368 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,953 [10] 1,380    
Gross Additions 0 160    
Gross Reductions 33 0    
Ending balance 1,920 1,540    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Preferred Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13] $ 570      
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 30      
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 1,166      
Investment, Identifier [Axis]: Batjer TopCo, LLC, , Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 20      
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) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 21 39    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 570 [11] 680    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 570 $ 680    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.00% 10.00% 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 1 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 50 0    
Gross Additions 0 50    
Gross Reductions 30 0    
Ending balance $ 20 $ 50    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.00% 10.00% 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 1 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 30 30    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 30 $ 30    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.00% 10.00% 10.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 (1)    
Amount of Interest, Fees or Dividends Credited to Income 32 31    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,165 1,175    
Gross Additions 1 1    
Gross Reductions 0 1    
Ending balance 1,166 1,175    
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Ending balance [24] 0      
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [25] 0      
Ending balance [24] 0      
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 3        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [25] 0      
Ending balance [24] $ 0      
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 10.25% [7],[15],[17]   10.25% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (14)      
Ending balance [7],[15],[17] $ (14)      
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [16] 14.76% [21]   15.76%  
Spread [16] 10.25% [21]   10.25%  
PIK Rate [16] 9.25% [21]   9.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 6,963      
Ending balance [16],[21] 5,662      
Investment, Identifier [Axis]: Binswanger Enterprises, LLC, Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10] 650      
Ending balance [12] 880      
Investment, Identifier [Axis]: Bluestem Brands, Inc., Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Ending balance $ 0      
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.95% [7],[15]   13.17% [16]  
Spread 8.50% [7],[15]   8.50% [16]  
PIK Rate 11.95% [7],[15]   12.17% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 181      
Ending balance [7],[15] $ 139      
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 15.00% [7],[15]   15.00% [16]  
Spread 7.50% [7],[15]   7.50% [16]  
PIK Rate 14.75% [7],[15]   14.75% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,792      
Ending balance [7],[15] $ 2,600      
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 12.95% [7],[15]   13.17% [16]  
Spread 8.50% [7],[15]   8.50% [16]  
PIK Rate 11.95% [7],[15]   12.17% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 3,790      
Ending balance [7],[15] 2,897      
Investment, Identifier [Axis]: Bluestem Brands, Inc., Warrants        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [8] 0      
Ending balance [9] 0      
Investment, Identifier [Axis]: Boccella Precast Products LLC, Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 80      
Ending balance [13] $ 280      
Investment, Identifier [Axis]: Boccella Precast Products LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 10.00%   10.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 66      
Ending balance 65      
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Ending balance 0      
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 310      
Ending balance $ 310      
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.46% [15]   11.65% [16]  
Spread 7.00% [15]   7.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 360      
Ending balance [15] $ 360      
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.46% [15]   10.74% [16]  
Spread 6.00% [15]   6.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 3,999      
Ending balance [15] $ 3,989      
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 12.46% [15]   12.74% [16]  
Spread 8.00% [15]   8.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 3,999      
Ending balance [15] 3,989      
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Preferred Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [11] $ 1,030      
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate [16] 14.48%      
Spread [16] 10.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [16] $ 1,254      
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Preferred Member Units        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 0 0    
Amount of Unrealized Gain/(Loss) (140) 30    
Amount of Interest, Fees or Dividends Credited to Income 8 8    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,170 1,400    
Gross Additions 0 30    
Gross Reductions 140 0    
Ending balance 1,030 1,430    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Provider of Crane Rental and Operating Services, Preferred Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] 1,170      
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Provider of Crane Rental and Operating Services, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate [16]     14.66%  
Spread [16]     10.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,254      
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 14.48%   15.48%  
Spread 10.00%   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 45 52    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,254 1,374    
Gross Additions 0 0    
Gross Reductions 0 31    
Ending balance 1,254 $ 1,343    
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 [26] 1,039      
Ending balance [27] 969      
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 [16],[26] 8,031      
Ending balance [13],[27] $ 7,704      
Investment, Identifier [Axis]: Buca C, LLC, Preferred Member Units        
Schedule of Investments [Line Items]        
Total Rate 6.00%   6.00%  
PIK Rate 6.00%   6.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 0      
Ending balance $ 0      
Investment, Identifier [Axis]: Buca C, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 15.00% [7],[28]   15.00% [21],[22]  
PIK Rate 15.00% [7],[28]   15.00% [21],[22]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [21],[22] $ 0      
Ending balance [7],[28] $ 0      
Investment, Identifier [Axis]: Buca C, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 15.00% [7],[17]   15.00% [21]  
PIK Rate 15.00% [7],[17]   15.00% [21]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [21] $ 0      
Ending balance [7],[17] $ 0      
Investment, Identifier [Axis]: Buca C, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 15.00% [7],[28]   15.00% [21],[22]  
PIK Rate 15.00% [7],[28]   15.00% [21],[22]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [21],[22] $ 0      
Ending balance [7],[28] $ 0      
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 5.00% [15],[17]   5.00% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ 0      
Ending balance [15],[17] $ 0      
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 9.45% [15]   9.46% [16]  
Spread 5.00% [15]   5.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 11,575      
Ending balance [15] 10,955      
Investment, Identifier [Axis]: CAI Software LLC, Preferred Equity 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 513      
Ending balance 594      
Investment, Identifier [Axis]: CAI Software LLC, Preferred Equity 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Ending balance $ 0      
Investment, Identifier [Axis]: CQ Fluency, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 6.75% [15],[17]   6.75% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (31)      
Ending balance [15],[17] $ (28)      
Investment, Identifier [Axis]: CQ Fluency, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Spread 6.75% [15],[17]   6.75% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (31)      
Ending balance [15],[17] $ (28)      
Investment, Identifier [Axis]: CQ Fluency, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.15% [15]   11.18% [16]  
Spread 6.75% [15]   6.75% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 7,169      
Ending balance [15] 7,017      
Investment, Identifier [Axis]: Career Team Holdings, LLC, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 530      
Ending balance $ 530      
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [15] 10.38%   10.56%  
Spread [15] 6.00%   6.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [15] $ 97      
Ending balance [15] $ 197      
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.50%   12.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 2,134      
Ending balance 2,115      
Investment, Identifier [Axis]: CaseWorthy, Inc., Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10] 160      
Ending balance [12] 186      
Investment, Identifier [Axis]: CenterPeak Holdings, LLC, Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] 1,610      
Ending balance [13] 1,780      
Investment, Identifier [Axis]: CenterPeak Holdings, LLC, Secured Debt 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [18] 0      
Ending balance [17] $ 0      
Investment, Identifier [Axis]: CenterPeak Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 15.00%   15.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 2,390      
Ending balance 2,390      
Investment, Identifier [Axis]: Centre Technologies Holdings, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate   14.48%    
Spread   9.00%    
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]: Centre Technologies Holdings, LLC, Preferred Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,110      
Ending balance 3,570      
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate   14.48% 13.66% [16]  
Spread   9.00% 9.00% [16]  
Amount of Realized Gain/(Loss)   $ 0    
Amount of Unrealized Gain/(Loss)   66    
Amount of Interest, Fees or Dividends Credited to Income   128    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 6,384 [16] 0    
Gross Additions   5,494    
Gross Reductions   0    
Ending balance   5,494    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Preferred Member Units        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss)   0    
Amount of Unrealized Gain/(Loss)   280    
Amount of Interest, Fees or Dividends Credited to Income   8    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance   2,760    
Gross Additions   280    
Gross Reductions   0    
Ending balance   $ 3,040    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 10.00% [15],[17]   6.00% [16],[18]  
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 [16],[18] 0      
Gross Additions 0      
Gross Reductions 0      
Ending balance [15],[17] 0      
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [16]     12.74%  
Spread [16]     8.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 3,905      
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 2.1        
Schedule of Investments [Line Items]        
Total Rate 14.48%      
Spread 10.00%      
Amount of Realized Gain/(Loss) $ 0      
Amount of Unrealized Gain/(Loss) (3)      
Amount of Interest, Fees or Dividends Credited to Income 225      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 6,384      
Gross Additions 2      
Gross Reductions 270      
Ending balance 6,116      
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate   14.48%    
Spread   9.00%    
Amount of Realized Gain/(Loss) 0 $ 0    
Amount of Unrealized Gain/(Loss) 460 (29)    
Amount of Interest, Fees or Dividends Credited to Income 8 84    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,110 4,394    
Gross Additions 460 0    
Gross Reductions 0 4,394    
Ending balance 3,570 0    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC,Secured Debt 1        
Schedule of Investments [Line Items]        
Spread [16],[18]     9.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ 0      
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC,Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [15] 14.48%      
Spread [15] 10.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 6,116      
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13] 8,560      
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13],[24] $ 908      
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread [15],[17] 6.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15],[17] $ 0      
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [15] 12.49%      
Spread [15] 8.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 4,305      
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) 280 60    
Amount of Interest, Fees or Dividends Credited to Income 698 366    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 8,280 [11] 7,330    
Gross Additions 280 60    
Gross Reductions 0 0    
Ending balance 8,560 7,390    
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) 20 35    
Amount of Interest, Fees or Dividends Credited to Income 6 6    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 888 [11],[25] 715    
Gross Additions 20 35    
Gross Reductions 0 0    
Ending balance $ 908 $ 750    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate       11.49%
Spread 6.00% 6.00%    
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) (6) (6)    
Amount of Interest, Fees or Dividends Credited to Income 6 6    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0 0    
Gross Additions 6 6    
Gross Reductions 6 6    
Ending balance $ 0 $ 0    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.49%     13.49%
Spread 8.00% 8.00%    
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 2 0    
Amount of Interest, Fees or Dividends Credited to Income 125 133    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,905 3,905    
Gross Additions 400 0    
Gross Reductions 0 0    
Ending balance $ 4,305 3,905    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.56% [14],[15]   11.53% [16],[23]  
Spread 7.00% [14],[15]   7.00% [16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[23] $ 444      
Ending balance [14],[15] $ 559      
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.55% [15]   11.93% [16]  
Spread 7.00% [15]   7.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 3,166      
Ending balance [15] $ 3,247      
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.55% [15]   11.93% [16]  
Spread 7.00% [15]   7.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 175      
Ending balance [15] $ 180      
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate 11.55% [15]   11.93% [16]  
Spread 7.00% [15]   7.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 424      
Ending balance [15] 435      
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 90    
Amount of Interest, Fees or Dividends Credited to Income 82 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,900 [11] 3,920    
Gross Additions 0 90    
Gross Reductions 0 0    
Ending balance 3,900 4,010    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13] 2,760      
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [17] $ 0      
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 241      
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) 10 (290)    
Amount of Interest, Fees or Dividends Credited to Income 111 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 2,750 [11] 1,300    
Gross Additions 10 0    
Gross Reductions 0 290    
Ending balance 2,760 1,010    
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) 80 (45)    
Amount of Interest, Fees or Dividends Credited to Income 0 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 237 [25] 282    
Gross Additions 80 0    
Gross Reductions 0 45    
Ending balance 317 $ 237    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [18] 0      
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 1.1        
Schedule of Investments [Line Items]        
Total Rate   12.00%    
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]: Clad-Rex Steel, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate     9.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 1,690      
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 2.1        
Schedule of Investments [Line Items]        
Total Rate 9.00% 12.00%    
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 40 64    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,690 2,103    
Gross Additions 0 0    
Gross Reductions 60 3    
Ending balance $ 1,630 $ 2,100    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.00% 10.00% 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 6 6    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 243 251    
Gross Additions 0 0    
Gross Reductions 2 2    
Ending balance 241 249    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC,, Member Units 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [24] $ 317      
Investment, Identifier [Axis]: Clad-Rex Steel, LLC,, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 9.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 1,630      
Investment, Identifier [Axis]: Clarius BIGS, LLC, Secured Debt        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10],[21],[22] 19      
Ending balance [7],[12],[28] 16      
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Preferred Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] 710      
Ending balance [13] 660      
Investment, Identifier [Axis]: Cody Pools, Inc., Preferred Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13],[24] 17,370      
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) 420 430    
Amount of Interest, Fees or Dividends Credited to Income 321 153    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 16,950 [11],[25] 18,120    
Gross Additions 420 430    
Gross Reductions 0 0    
Ending balance 17,370 $ 18,550    
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate   12.50%    
Amount of Realized Gain/(Loss) 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 2    
Amount of Interest, Fees or Dividends Credited to Income 1 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0 [18] 0    
Gross Additions 0 236    
Gross Reductions 0 236    
Ending balance $ 0 [17] $ 0    
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.50% 12.50% 12.50%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) (2) (2)    
Amount of Interest, Fees or Dividends Credited to Income 203 223    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 6,598 7,111    
Gross Additions 2 2    
Gross Reductions 273 117    
Ending balance 6,327 6,996    
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [17] $ 0      
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 3,499      
Investment, Identifier [Axis]: Colonial Electric Company LLC, Preferred Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13] 3,580      
Investment, Identifier [Axis]: Colonial Electric Company LLC, Preferred Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] 3,390      
Investment, Identifier [Axis]: Colonial Electric Company LLC, Preferred Member Units 1        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 0 0    
Amount of Unrealized Gain/(Loss) 190 0    
Amount of Interest, Fees or Dividends Credited to Income 104 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,390 600    
Gross Additions 190 0    
Gross Reductions 0 0    
Ending balance 3,580 600    
Investment, Identifier [Axis]: Colonial Electric Company 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   24    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance   1,920    
Gross Additions   160    
Gross Reductions   0    
Ending balance   $ 2,080    
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate   12.00%    
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 0 [18] 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 0 $ 0    
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.00% 12.00% 12.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) (5) 41    
Amount of Interest, Fees or Dividends Credited to Income 110 173    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,578 5,407    
Gross Additions 5 53    
Gross Reductions 84 498    
Ending balance 3,499 4,962    
Investment, Identifier [Axis]: Compass Systems & Sales, LLC, Secured Debt 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [17] $ (15)      
Investment, Identifier [Axis]: Compass Systems & Sales, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 13.50%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 4,207      
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) 3 0    
Amount of Interest, Fees or Dividends Credited to Income 15 15    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,860 1,863    
Gross Additions 3 0    
Gross Reductions 0 0    
Ending balance 1,863 $ 1,863    
Investment, Identifier [Axis]: Compass Systems & Sales, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate   13.50%    
Amount of Realized Gain/(Loss) 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 1 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance (16) [18] 0    
Gross Additions 1 0    
Gross Reductions 0 0    
Ending balance $ (15) $ 0    
Investment, Identifier [Axis]: Compass Systems & Sales, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 13.50% 13.50% 13.50%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 151 153    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 4,201 4,175    
Gross Additions 6 7    
Gross Reductions 0 0    
Ending balance $ 4,207 4,182    
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.70% [14],[15]   12.93% [16],[23]  
Spread 8.25% [14],[15]   8.25% [16],[23]  
PIK Rate [14],[15] 11.96%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[23] $ 6,118      
Ending balance [14],[15] $ 6,175      
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [15] 12.70%      
Spread 8.25% [15]   8.25% [16],[18]  
PIK Rate [15] 11.96%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (42)      
Ending balance [15] 15,009      
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate [16]     12.92%  
Spread [16]     8.25%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] 14,807      
Investment, Identifier [Axis]: Connect Telecommunications Solutions Holdings, Inc., Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,400      
Ending balance $ 1,400      
Investment, Identifier [Axis]: Connect Telecommunications Solutions Holdings, Inc., Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 13.00%   13.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 2,977      
Ending balance 2,941      
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) 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 530 [26],[29],[30] 568    
Gross Additions 0 0    
Gross Reductions 16 0    
Ending balance $ 514 [27],[31],[32] 568    
Investment, Identifier [Axis]: Coregistics Buyer LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 10.31% [14],[15]   10.39% [16]  
Spread 6.00% [14],[15]   6.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 440      
Ending balance [14],[15] $ 449      
Investment, Identifier [Axis]: Coregistics Buyer LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.32% [15]   10.36% [16]  
Spread 6.00% [15]   6.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,824      
Ending balance [15] $ 2,863      
Investment, Identifier [Axis]: Coregistics Buyer LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.31% [15]   10.40% [16]  
Spread 6.00% [15]   6.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,878      
Ending balance [15] $ 1,909      
Investment, Identifier [Axis]: Coregistics Buyer LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate 10.57% [15]   10.61% [16]  
Spread 6.25% [15]   6.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 8,109      
Ending balance [15] 8,197      
Investment, Identifier [Axis]: Creative Foam Corporation, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 286      
Investment, Identifier [Axis]: Creative Foam Corporation, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 6.25% [15],[17]   5.75% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (28)      
Ending balance [15],[17] $ (26)      
Investment, Identifier [Axis]: Creative Foam Corporation, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.55% [15]   10.11% [16]  
Spread 6.25% [15]   5.75% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 10,694      
Ending balance [15] $ 10,732      
Investment, Identifier [Axis]: Creative Foam Corporation, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate [15] 10.57%      
Spread [15] 6.25%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 17,106      
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 1,486      
Gross Additions 0      
Gross Reductions 0      
Ending balance $ 1,486      
Investment, Identifier [Axis]: DMA Industries, LLC, Preferred Equity 2        
Schedule of Investments [Line Items]        
Total Rate 15.00%   15.00% [11]  
PIK Rate 15.00%   15.00% [11]  
Amount of Realized Gain/(Loss) $ 0      
Amount of Unrealized Gain/(Loss) 0      
Amount of Interest, Fees or Dividends Credited to Income 30      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] 810      
Gross Additions 30      
Gross Reductions 0      
Ending balance $ 840      
Investment, Identifier [Axis]: DMA Industries, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.00%   12.00%  
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 138      
Gross Additions 0      
Gross Reductions 0      
Ending balance $ 138      
Investment, Identifier [Axis]: DMA Industries, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.00%   12.00%  
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 4,161      
Gross Additions 2      
Gross Reductions 0      
Ending balance 4,163      
Investment, Identifier [Axis]: DMA Industries, LLC. Preferred Equity 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 1,486      
Investment, Identifier [Axis]: DMA Industries, LLC. Preferred Equity 2        
Schedule of Investments [Line Items]        
Total Rate [13] 15.00%      
PIK Rate [13] 15.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13] $ 840      
Investment, Identifier [Axis]: DMA Industries, LLC. Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 4,163      
Investment, Identifier [Axis]: DMA Industries, LLC., Secured Debt 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 138      
Investment, Identifier [Axis]: DTE Enterprises, LLC, Class A Preferred Member Units        
Schedule of Investments [Line Items]        
Total Rate 8.00%   8.00%  
PIK Rate 8.00%   8.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 0      
Ending balance $ 0      
Investment, Identifier [Axis]: DTE Enterprises, LLC, Class AA Preferred Member Units (non-voting)        
Schedule of Investments [Line Items]        
Total Rate 10.00%   10.00% [11]  
PIK Rate 10.00%   10.00% [11]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] $ 438      
Ending balance 0      
Investment, Identifier [Axis]: Dalton US Inc., Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10] 50      
Ending balance [12] 60      
Investment, Identifier [Axis]: Datacom, LLC, Preferred Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 30      
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 876      
Investment, Identifier [Axis]: Datacom, LLC, , Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 7.50%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 104      
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 10    
Amount of Interest, Fees or Dividends Credited to Income 0 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 30 10    
Gross Additions 0 10    
Gross Reductions 0 0    
Ending balance $ 30 $ 20    
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 7.50% 7.50% 7.50%  
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 55 49    
Gross Additions 64 25    
Gross Reductions 15 20    
Ending balance $ 104 $ 54    
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.00% 10.00% 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 27 29    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 878 844    
Gross Additions 6 5    
Gross Reductions 8 7    
Ending balance 876 842    
Investment, Identifier [Axis]: Digital Products Holdings LLC, Preferred Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13] $ 2,459      
Investment, Identifier [Axis]: Digital Products Holdings LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate [15] 14.38%      
Spread [15] 10.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 3,026      
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 13 13    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 2,459 [11] 2,459    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 2,459 $ 2,459    
Investment, Identifier [Axis]: Digital Products Holdings LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 14.38% 15.38% 14.56% [16]  
Spread 10.00%   10.00% [16]  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 113 146    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,105 [16] 3,673    
Gross Additions 4 6    
Gross Reductions 83 364    
Ending balance 3,026 3,315    
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Preferred Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 4,620      
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) 140 (120)    
Amount of Interest, Fees or Dividends Credited to Income 0 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 4,480 5,180    
Gross Additions 140 0    
Gross Reductions 0 120    
Ending balance 4,620 5,060    
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., 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 6    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0 [18] 217    
Gross Additions 0 225    
Gross Reductions 0 442    
Ending balance $ 0 [17] $ 0    
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 14.00% 14.00% 14.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) (3) (4)    
Amount of Interest, Fees or Dividends Credited to Income 165 179    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 4,668 5,002    
Gross Additions 3 4    
Gross Reductions 87 88    
Ending balance 4,584 4,918    
Investment, Identifier [Axis]: Dynamic Communities, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Ending balance 0      
Investment, Identifier [Axis]: Dynamic Communities, LLC, Preferred Equity 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 60      
Ending balance 110      
Investment, Identifier [Axis]: Dynamic Communities, LLC, Preferred Equity 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Ending balance $ 0      
Investment, Identifier [Axis]: Dynamic Communities, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.92% [15]   11.46% [16]  
Spread 7.50% [15]   7.00% [16]  
PIK Rate 11.92% [15]   11.46% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,220      
Ending balance [15] $ 2,286      
Investment, Identifier [Axis]: Dynamic Communities, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 13.92% [15]   13.46% [16]  
Spread 9.50% [15]   9.00% [16]  
PIK Rate 13.92% [15]   13.46% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,219      
Ending balance [15] $ 2,300      
Investment, Identifier [Axis]: Electro Technical Industries, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread [15],[17] 6.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15],[17] $ (93)      
Investment, Identifier [Axis]: Electro Technical Industries, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 714      
Investment, Identifier [Axis]: Electro Technical Industries, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [15] 10.30%      
Spread [15] 6.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 26,516      
Investment, Identifier [Axis]: Elgin AcquireCo, LLC, Common Stock 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 370      
Ending balance 330      
Investment, Identifier [Axis]: Elgin AcquireCo, LLC, Common Stock 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [25] 199      
Ending balance [24] $ 203      
Investment, Identifier [Axis]: Elgin AcquireCo, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 6.00% [15],[17]   6.00% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ 0      
Ending balance [15],[17] $ 0      
Investment, Identifier [Axis]: Elgin AcquireCo, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.00%   12.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 1,162      
Ending balance $ 1,159      
Investment, Identifier [Axis]: Elgin AcquireCo, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 9.00%   9.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 406      
Ending balance $ 405      
Investment, Identifier [Axis]: Emerald Technologies Acquisition Co, Inc., Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 10.67% [15],[33]   10.71% [16]  
Spread 6.25% [15],[33]   6.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,863      
Ending balance [15],[33] 1,734      
Investment, Identifier [Axis]: Escalent, Inc., Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 240      
Ending balance [13] $ 240      
Investment, Identifier [Axis]: Escalent, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 8.00% [15],[17]   8.00% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (7)      
Ending balance [15],[17] $ (7)      
Investment, Identifier [Axis]: Escalent, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.40% [15]   12.39% [16]  
Spread 8.00% [15]   8.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 358      
Ending balance [15] $ 363      
Investment, Identifier [Axis]: Escalent, Inc., Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 12.40% [15]   12.43% [16]  
Spread 8.00% [15]   8.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 6,855      
Ending balance [15] $ 6,837      
Investment, Identifier [Axis]: Event Holdco, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.56% [15]   12.59% [16]  
Spread 8.00% [15]   8.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 308      
Ending balance [15] $ 308      
Investment, Identifier [Axis]: Event Holdco, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.56% [15]   12.59% [16]  
Spread 8.00% [15]   8.00% [16]  
PIK Rate 4.00% [15]   6.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 3,969      
Ending balance [15] $ 3,994      
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 13.00%   13.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 7,135      
Ending balance 8,098      
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC, Warrants        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [8] 2,710      
Ending balance [9],[13] 3,660      
Investment, Identifier [Axis]: Fidelity Government Portfolio Fund Class III        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [34] 2,099      
Ending balance [35] $ 1,563      
Investment, Identifier [Axis]: First American Treasury Obligations Fund Class Z        
Schedule of Investments [Line Items]        
Total Rate 4.21%   4.41%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [36] $ 12,261      
Ending balance [37] 13,968      
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) 860 0    
Amount of Interest, Fees or Dividends Credited to Income 574 170    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 8,980 [11] 6,970    
Gross Additions 860 0    
Gross Reductions 0 0    
Ending balance 9,840 [13] 6,970    
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 0    
Amount of Unrealized Gain/(Loss) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 0 138    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,263 [11],[26],[29],[30] 3,705    
Gross Additions 0 0    
Gross Reductions 965 0    
Ending balance 298 3,705    
Investment, Identifier [Axis]: GFG Group, LLC, Preferred Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13] $ 2,410      
Investment, Identifier [Axis]: GFG Group, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 8.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 2,046      
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) (230) (410)    
Amount of Interest, Fees or Dividends Credited to Income 109 164    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 2,640 [11] 2,870    
Gross Additions 0 0    
Gross Reductions 230 410    
Ending balance $ 2,410 $ 2,460    
Investment, Identifier [Axis]: GFG Group, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 8.00% 8.00% 8.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) (3) (4)    
Amount of Interest, Fees or Dividends Credited to Income 44 51    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 2,046 2,336    
Gross Additions 3 4    
Gross Reductions 3 4    
Ending balance $ 2,046 2,336    
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 10.48%      
Spread 6.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 1,550      
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.48%      
Spread 8.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 19,944      
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) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 742 21    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 22,600 21,890    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 22,600 [13] $ 21,890    
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 10.48% 11.48% 10.66%  
Spread 6.00% 6.00% 6.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) (1) (1)    
Amount of Interest, Fees or Dividends Credited to Income 42 35    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,550 1,182    
Gross Additions 1 1    
Gross Reductions 1 1    
Ending balance $ 1,550 $ 1,182    
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.48% 13.48% 12.66%  
Spread 8.00% 8.00% 8.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) (12) (12)    
Amount of Interest, Fees or Dividends Credited to Income 632 692    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 19,944 19,944    
Gross Additions 12 12    
Gross Reductions 12 12    
Ending balance 19,944 19,944    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Member Unit        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13] 28,690      
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Member Units        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 0 0    
Amount of Unrealized Gain/(Loss) 0 2,460    
Amount of Interest, Fees or Dividends Credited to Income 414 372    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 28,690 [11] 24,180    
Gross Additions 0 2,460    
Gross Reductions 0 0    
Ending balance $ 28,690 $ 26,640    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate   10.00%    
Spread 7.50% [15],[17],[38] 7.00% 7.00% [16],[18],[39]  
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 [16],[18],[39] 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 0 [15],[17],[38] $ 0    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.50% [15] 10.00% 11.00% [16],[39]  
Spread 7.50% [15] 7.00% 7.00% [16],[39]  
Amount of Realized Gain/(Loss)   $ 0    
Amount of Unrealized Gain/(Loss)   (17)    
Amount of Interest, Fees or Dividends Credited to Income   353    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 18,282 [16],[39] 13,520    
Gross Additions   17    
Gross Reductions   417    
Ending balance $ 18,282 [15] 13,120    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Secured Debt 2.1        
Schedule of Investments [Line Items]        
Total Rate 11.50%      
Spread 7.50%      
Amount of Realized Gain/(Loss) $ 0      
Amount of Unrealized Gain/(Loss) (10)      
Amount of Interest, Fees or Dividends Credited to Income 535      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 18,282      
Gross Additions 10      
Gross Reductions 10      
Ending balance 18,282      
Investment, Identifier [Axis]: Garyline, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 150      
Ending balance 150      
Investment, Identifier [Axis]: Garyline, LLC, Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 16      
Investment, Identifier [Axis]: Garyline, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.16% [14],[15]   11.29% [16],[23]  
Spread 6.75% [14],[15]   6.75% [16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[23] $ 2,416      
Ending balance [14],[15] $ 2,626      
Investment, Identifier [Axis]: Garyline, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.17% [15]   11.34% [16]  
Spread 6.75% [15]   6.75% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 9,567      
Ending balance [15] 9,543      
Investment, Identifier [Axis]: GradeEight Corp., Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 471      
Ending balance $ 471      
Investment, Identifier [Axis]: GradeEight Corp., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [15] 13.75%      
Spread 6.25% [15]   7.25% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (45)      
Ending balance [15] $ 528      
Investment, Identifier [Axis]: GradeEight Corp., Secured Debt 2        
Schedule of Investments [Line Items]        
Spread 7.25% [15],[17]   7.25% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (22)      
Ending balance [15],[17] $ (21)      
Investment, Identifier [Axis]: GradeEight Corp., Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.57% [15],[40]   11.74% [16]  
Spread 7.25% [15],[40]   7.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 14,542      
Ending balance [15],[40] 14,370      
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 0      
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
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 [7] 12.50%      
PIK Rate [7] 12.50%      
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 378      
Gross Additions 56      
Gross Reductions 0      
Ending balance [7] 434      
Investment, Identifier [Axis]: Gulf Publishing Holdings, 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 0 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance 0 0    
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Preferred Equity        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 0 0    
Amount of Unrealized Gain/(Loss) 0 (240)    
Amount of Interest, Fees or Dividends Credited to Income 0 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0 620    
Gross Additions 0 0    
Gross Reductions 0 240    
Ending balance $ 0 $ 380    
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate   14.98%    
Spread 9.50% [7],[15],[17] 9.50% 9.50% [16],[18],[21]  
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 [16],[18],[21] 0    
Gross Additions   0    
Gross Reductions   0    
Ending balance 0 [7],[15],[17] $ 0    
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate   12.50% 12.50% [21]  
PIK Rate [21]     12.50%  
Amount of Realized Gain/(Loss)   $ 0    
Amount of Unrealized Gain/(Loss)   0    
Amount of Interest, Fees or Dividends Credited to Income   19    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 378 [21] 571    
Gross Additions   0    
Gross Reductions   0    
Ending balance   571    
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Ending balance $ 0      
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 8.75% [15]   8.75% [16]  
Spread 3.50% [15]   3.50% [16]  
PIK Rate 2.50% [15]   2.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,307      
Ending balance [15] $ 1,236      
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 2.50% [7]   2.50% [21]  
PIK Rate 2.50% [7]   2.50% [21]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [21] $ 235      
Ending balance [7] $ 137      
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 6.50% [15],[17]   6.50% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (10)      
Ending balance [15],[17] $ (9)      
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.82% [15]   10.86% [16]  
Spread 6.50% [15]   6.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,975      
Ending balance [15] $ 1,970      
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.82% [15]   10.86% [16]  
Spread 6.50% [15]   6.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,396      
Ending balance [15] $ 1,393      
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate 10.82% [15]   10.86% [16]  
Spread 6.50% [15]   6.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 4,875      
Ending balance [15] $ 4,863      
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt 5        
Schedule of Investments [Line Items]        
Total Rate 10.82% [15]   10.86% [16]  
Spread 6.50% [15]   6.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,382      
Ending balance [15] 2,376      
Investment, Identifier [Axis]: HPEP 3, L.P., LP Interests (HPEP 3, L.P.)        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 0 0    
Amount of Unrealized Gain/(Loss) 194 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 4,472 4,225    
Gross Additions 194 0    
Gross Reductions 204 0    
Ending balance 4,462 4,225    
Investment, Identifier [Axis]: Harris Preston Fund Investments        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [27],[31],[32] 4,462      
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (2717 MH, L.P.)        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 0 10    
Amount of Unrealized Gain/(Loss) (166) 0    
Amount of Interest, Fees or Dividends Credited to Income 0 40    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 8,740 [11],[26],[29],[30] 6,050    
Gross Additions 80 10    
Gross Reductions 165 10    
Ending balance 8,655 [31],[32] 6,050    
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (HPEP 3, L.P.)        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [26],[29],[30] 4,472      
Ending balance [12] 7,090      
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Preferred Member Units 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] 5,060      
Ending balance [13] 5,280      
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Preferred Member Units 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [25] 270      
Ending balance [24] $ 280      
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 10.48% [15]   10.73% [16]  
Spread 6.00% [15]   6.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 661      
Ending balance [15] $ 626      
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.50%   12.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 9,744      
Ending balance $ 9,744      
Investment, Identifier [Axis]: Hornblower Sub, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 9.80% [14],[15]   9.92% [16]  
Spread 5.50% [14],[15]   5.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,204      
Ending balance [14],[15] $ 2,395      
Investment, Identifier [Axis]: Hornblower Sub, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 9.81% [15]   10.11% [16]  
Spread 5.50% [15]   5.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 15,338      
Ending balance [15] $ 15,212      
Investment, Identifier [Axis]: Hybrid Promotions, LLC , Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 12.82% [12],[15]   13.10% [10],[16]  
Spread 8.25% [12],[15]   8.25% [10],[16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10],[16] $ 8,000      
Ending balance [12],[15] 8,000      
Investment, Identifier [Axis]: IG Investor, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 4,450      
Investment, Identifier [Axis]: IG Investor, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 13.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 400      
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) 390 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 4,060 3,600    
Gross Additions 390 0    
Gross Reductions 0 0    
Ending balance $ 4,450 $ 3,600    
Investment, Identifier [Axis]: IG Investor, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 13.00% 13.00% 13.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 19 0    
Amount of Interest, Fees or Dividends Credited to Income 15 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 379 (27)    
Gross Additions 21 2    
Gross Reductions 0 0    
Ending balance $ 400 $ (25)    
Investment, Identifier [Axis]: IG Investor, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 13.00% 13.00% 13.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 168 0    
Amount of Interest, Fees or Dividends Credited to Income 300 319    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 8,693 9,069    
Gross Additions 183 17    
Gross Reductions 110 111    
Ending balance $ 8,766 8,975    
Investment, Identifier [Axis]: IG Parent Corporation, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 5.75% [15],[17]   5.75% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ 0      
Ending balance [15],[17] $ 0      
Investment, Identifier [Axis]: IG Parent Corporation, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.17% [15]   10.21% [16],[18]  
Spread 5.75% [15]   5.75% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ 6,154      
Ending balance [15] $ 6,154      
Investment, Identifier [Axis]: IG Parent Corporation, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.17% [15]   10.21% [16],[18]  
Spread 5.75% [15]   5.75% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ 1,922      
Ending balance [15] $ 1,917      
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.96% [15]   13.78% [16]  
Spread 8.50% [15]   9.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 295      
Ending balance [15] $ 295      
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.96% [15]   13.78% [16]  
Spread 8.50% [15]   9.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 248      
Ending balance [15] $ 248      
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.96% [15]   12.78% [16]  
Spread 7.50% [15]   8.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,110      
Ending balance [15] $ 1,110      
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate 13.96% [15]   14.78% [16]  
Spread 9.50% [15]   10.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,110      
Ending balance [15] 1,110      
Investment, Identifier [Axis]: ITA Holdings Group, LLC, Warrants        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [8] 1,420      
Ending balance [9] 1,660      
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C., Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 510      
Ending balance [12] 640      
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [16],[23]     11.39%  
Spread [16],[23]     7.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[23] 791      
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [16]     11.62%  
Spread [16]     7.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 10,280      
Investment, Identifier [Axis]: Implus Footcare, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 13.73% [7],[12],[15]   13.73% [10],[16]  
Spread 7.75% [7],[12],[15]   7.75% [10],[16]  
PIK Rate [10],[16]     1.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10],[16] $ 14,524      
Ending balance [7],[12],[15] 12,262      
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) (200) 80    
Amount of Interest, Fees or Dividends Credited to Income 0 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 7,290 [10] 6,320    
Gross Additions 0 80    
Gross Reductions 200 0    
Ending balance 7,090 6,400    
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC, Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] 2,310      
Ending balance [13] $ 2,020      
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 12.00%   12.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 3,763      
Ending balance 3,706      
Investment, Identifier [Axis]: Insight Borrower Corporation, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 120      
Ending balance $ 120      
Investment, Identifier [Axis]: Insight Borrower Corporation, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 6.25% [15],[17]   6.25% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (32)      
Ending balance [15],[17] $ (29)      
Investment, Identifier [Axis]: Insight Borrower Corporation, Secured Debt 2        
Schedule of Investments [Line Items]        
Spread 6.25% [15],[17]   6.25% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (27)      
Ending balance [15],[17] $ (26)      
Investment, Identifier [Axis]: Insight Borrower Corporation, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.54% [15]   10.87% [16]  
Spread 6.25% [15]   6.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 7,869      
Ending balance [15] $ 15,601      
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [14],[15] 14.42%      
Spread [14],[15] 10.00%      
PIK Rate [14],[15] 2.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [14],[15] $ 659      
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [15] 14.42%      
Spread [15] 10.00%      
PIK Rate [15] 2.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 5,677      
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate [15] 14.42%      
Spread [15] 10.00%      
PIK Rate [15] 2.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 1,143      
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate [15] 14.42%      
Spread [15] 10.00%      
PIK Rate [15] 2.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 264      
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 21      
Ending balance 30      
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [16],[23]     14.69%  
Spread [16],[23]     10.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[23] 620      
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [16]     14.58%  
Spread [16]     10.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] 5,681      
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate [16]     14.58%  
Spread [16]     10.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] 1,144      
Investment, Identifier [Axis]: Integral Energy Services, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 640      
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) 0 170    
Amount of Interest, Fees or Dividends Credited to Income 0 13    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 640 190    
Gross Additions 0 170    
Gross Reductions 0 0    
Ending balance $ 640 $ 360    
Investment, Identifier [Axis]: Integral Energy Services, Preferred Equity        
Schedule of Investments [Line Items]        
Total Rate 10.00% [13] 10.00% 10.00% [11]  
PIK Rate 10.00% [13] 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 7 10    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 535 [11] 350    
Gross Additions 7 10    
Gross Reductions 0 0    
Ending balance $ 542 [13] $ 360    
Investment, Identifier [Axis]: Integral Energy Services, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 12.07% 13.09% 12.35% [16]  
Spread 7.50% 7.50% 7.50% [16]  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 277    
Amount of Interest, Fees or Dividends Credited to Income 471 595    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 14,872 [16] 16,232    
Gross Additions 15 312    
Gross Reductions 0 1,585    
Ending balance $ 14,887 14,959    
Investment, Identifier [Axis]: Integral Energy Services, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [15] 12.07%      
Spread [15] 7.50%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 14,887      
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Ending balance $ 0      
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 14.41% [14],[28]   14.54% [22],[23]  
Spread 10.00% [14],[28]   10.00% [22],[23]  
PIK Rate 14.41% [14],[28]   14.54% [22],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [22],[23] $ 1,580      
Ending balance [14],[28] $ 1,655      
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.67% [7],[15],[28]   11.67% [16],[21],[22]  
Spread 7.00% [7],[15],[28]   7.00% [16],[21],[22]  
PIK Rate 11.67% [7],[15],[28]   11.67% [16],[21],[22]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[21],[22] $ 13      
Ending balance [7],[15],[28] $ 10      
Investment, Identifier [Axis]: Invincible Boat Company, LLC., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.97% [14],[15]   12.01% [16],[23]  
Spread 7.50% [14],[15]   7.50% [16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[23] $ 996      
Ending balance [14],[15] $ 988      
Investment, Identifier [Axis]: Invincible Boat Company, LLC., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.97% [15]   12.01% [16]  
Spread 7.50% [15]   7.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 16,098      
Ending balance [15] 15,868      
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 710      
Ending balance $ 710      
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Preferred Equity        
Schedule of Investments [Line Items]        
Total Rate 25.00%   25.00%  
PIK Rate 25.00%   25.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 190      
Ending balance $ 190      
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 13.00%   13.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 1,113      
Ending balance $ 1,115      
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 13.00%   13.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 725      
Ending balance $ 726      
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 13.00%   13.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 2,236      
Ending balance $ 2,236      
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate 13.00%   13.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 4,344      
Ending balance $ 4,349      
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt 5        
Schedule of Investments [Line Items]        
Total Rate 13.00%   13.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 2,379      
Ending balance 2,316      
Investment, Identifier [Axis]: Isagenix International, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Ending balance $ 0      
Investment, Identifier [Axis]: Isagenix International, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 10.91% [15],[41]   11.25% [16]  
Spread 6.60% [15],[41]   6.60% [16]  
PIK Rate 8.41% [15],[41]   8.75% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 622      
Ending balance [15],[41] $ 428      
Investment, Identifier [Axis]: Island Pump and Tank, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 5.50% [15],[17]   6.50% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (5)      
Ending balance [15],[17] $ (5)      
Investment, Identifier [Axis]: Island Pump and Tank, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.07% [15],[40]   10.35% [16]  
Spread 5.50% [15],[40]   5.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,722      
Ending balance [15],[40] $ 2,063      
Investment, Identifier [Axis]: Island Pump and Tank, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.07% [15],[40]   11.35% [16]  
Spread 6.50% [15],[40]   6.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,722      
Ending balance [15],[40] $ 2,063      
Investment, Identifier [Axis]: Island Pump and Tank, LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate 12.07% [15],[40]   12.35% [16]  
Spread 7.50% [15],[40]   7.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,722      
Ending balance [15],[40] $ 2,063      
Investment, Identifier [Axis]: JDC Power Services, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 6.50% [15],[17]   6.50% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (47)      
Ending balance [15],[17] $ (44)      
Investment, Identifier [Axis]: JDC Power Services, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.80% [15]   10.83% [16]  
Spread 6.50% [15]   6.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 17,489      
Ending balance [15] 17,559      
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Common Eqiuty        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 30      
Ending balance $ 10      
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 10.80% [14],[15]   12.72% [16],[23]  
Spread 6.25% [14],[15]   8.00% [16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[23] $ 665      
Ending balance [14],[15] $ 665      
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.80% [15]   12.58% [16]  
Spread 6.25% [15]   8.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,823      
Ending balance [15] $ 2,787      
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.80% [15]   12.58% [16]  
Spread 6.25% [15]   8.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 265      
Ending balance [15] 262      
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Preferred Eqiuty        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,740      
Ending balance $ 1,740      
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.58% [15],[40]   12.18% [16],[42]  
Spread 7.00% [15],[40]   7.50% [16],[42]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[42] $ 1,585      
Ending balance [15],[40] $ 1,563      
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.45% [15],[40]   12.19% [16]  
Spread 7.00% [15],[40]   7.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,251      
Ending balance [15],[40] $ 1,251      
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.45% [15],[40]   12.18% [16]  
Spread 7.00% [15],[40]   7.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 121      
Ending balance [15],[40] $ 1,333      
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate 11.68% [15]   12.18% [16]  
Spread 7.00% [15]   7.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 3,685      
Ending balance [15] 3,633      
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 110      
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Common Stock 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Common Stock 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 110      
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 13.14% [15]   21.59% [16],[21],[22]  
Spread 8.75% [15]   16.00% [16],[21],[22]  
PIK Rate 6.00% [15]   21.59% [16],[21],[22]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[21],[22] $ 0      
Ending balance [15] $ 1,493      
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 13.14% [15]   21.59% [16],[21],[22]  
Spread 8.75% [15]   16.00% [16],[21],[22]  
PIK Rate 13.14% [15]   21.59% [16],[21],[22]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[21],[22] $ 0      
Ending balance [15] 1,127      
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate [16]     13.21%  
Spread [16]     8.75%  
PIK Rate [16]     6.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] 1,470      
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate [16]     13.18%  
Spread [16]     8.75%  
PIK Rate [16]     13.18%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,091      
Investment, Identifier [Axis]: JorVet Holdings, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 12.00%   12.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 2,568      
Ending balance 2,571      
Investment, Identifier [Axis]: JorVet Holdings, LLC., Preferred Eqiuty        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] 1,460      
Ending balance [13] $ 1,520      
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 14.50%      
Spread 9.75%      
Amount of Realized Gain/(Loss) $ (3,790)      
Amount of Unrealized Gain/(Loss) 3,202      
Amount of Interest, Fees or Dividends Credited to Income 0      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 5,973      
Gross Additions 0      
Gross Reductions 5,973      
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 4      
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 26      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Gross Additions 1,343      
Gross Reductions 0      
Ending balance $ 1,343      
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 25      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Gross Additions 1,430      
Gross Reductions 0      
Ending balance 1,430      
Investment, Identifier [Axis]: KMS, 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 6,113      
Gross Reductions 0      
Ending balance $ 6,113      
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 14.50%      
Spread 9.75%      
Amount of Realized Gain/(Loss) $ (511)      
Amount of Unrealized Gain/(Loss) 409      
Amount of Interest, Fees or Dividends Credited to Income 0      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 829      
Gross Additions 0      
Gross Reductions 829      
Ending balance $ 0      
Investment, Identifier [Axis]: KMS, LLC, Secured Debt 3        
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 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 562      
Gross Additions 0      
Gross Reductions 562      
Ending balance $ 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 9      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 550      
Gross Additions 0      
Gross Reductions 550      
Ending balance 0      
Investment, Identifier [Axis]: KMS, LLC, Wholesaler of Closeout and Value-Priced Products, Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 6,113      
Investment, Identifier [Axis]: KMS, LLC, Wholesaler of Closeout and Value-Priced Products, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.50%      
PIK Rate 12.50%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 1,343      
Investment, Identifier [Axis]: KMS, LLC, Wholesaler of Closeout and Value-Priced Products, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.50%      
PIK Rate 12.50%      
Investment, Identifier [Axis]: KMS, LLC, Wholesaler of Closeout and Value-priced Products, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [16],[21]     14.50%  
Spread [16],[21]     9.75%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[21] $ 829      
Investment, Identifier [Axis]: KMS, LLC, Wholesaler of Closeout and Value-priced Products, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [16]     14.23%  
Spread [16]     9.75%  
PIK Rate [16]     14.23%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] 562      
Investment, Identifier [Axis]: KMS, LLC, Wholesaler of Closeout and Value-priced Products, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate [16]     14.23%  
Spread [16]     9.75%  
PIK Rate [16]     14.23%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] 550      
Investment, Identifier [Axis]: KMS, LLC, Wholesaler of Closeout and Value-priced Products, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate [16],[21]     14.50%  
Spread [16],[21]     9.75%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[21] 5,973      
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, , Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 3,220      
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 7 8    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 678 [11],[25] 683    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance 678 [13],[24] 683    
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) 160 220    
Amount of Interest, Fees or Dividends Credited to Income 0 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,060 2,420    
Gross Additions 160 220    
Gross Reductions 0 0    
Ending balance $ 3,220 $ 2,640    
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.50% 12.00% 11.50%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 107 152    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,741 4,933    
Gross Additions 2 1    
Gross Reductions 200 0    
Ending balance $ 3,543 $ 4,934    
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 9.00% 9.00% 9.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 22 22    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 982 951    
Gross Additions 0 0    
Gross Reductions 3 2    
Ending balance $ 979 949    
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.67% [15]   11.89% [16]  
Spread 7.25% [15]   7.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 701      
Ending balance [15] $ 701      
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.67% [15]   11.92% [16]  
Spread 7.25% [15]   7.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 7,850      
Ending balance [15] $ 7,828      
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.67% [15]   11.71% [16]  
Spread 7.25% [15]   7.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 5,181      
Ending balance [15] $ 5,167      
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate 11.67% [15]   11.92% [16]  
Spread 7.25% [15]   7.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 860      
Ending balance [15] $ 858      
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt 5        
Schedule of Investments [Line Items]        
Total Rate 11.67% [15]   11.71% [16]  
Spread 7.25% [15]   7.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 8,716      
Ending balance [15] $ 8,695      
Investment, Identifier [Axis]: LLFlex, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 12.46% [12],[15]   12.74% [10],[16]  
Spread 8.00% [12],[15]   8.00% [10],[16]  
PIK Rate 3.00% [12],[15]   3.00% [10],[16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10],[16] $ 3,684      
Ending balance [12],[15] 3,630      
Investment, Identifier [Axis]: Lightbox Holdings, L.P., Secured Debt        
Schedule of Investments [Line Items]        
Total Rate [43]     9.44%  
Spread [43]     5.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [43] $ 5,534      
Investment, Identifier [Axis]: Logix Acquisition Company, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 12.25% [12],[15],[28]   12.25% [10],[16],[22]  
Spread 4.25% [12],[15],[28]   4.25% [10],[16],[22]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10],[16],[22] $ 9,191      
Ending balance [12],[15],[28] 11,323      
Investment, Identifier [Axis]: MH Corbin Holding 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   80    
Gross Additions   0    
Gross Reductions   0    
Ending balance   80    
Investment, Identifier [Axis]: MH Corbin Holding 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   0    
Gross Additions   0    
Gross Reductions   0    
Ending balance   $ 0    
Investment, Identifier [Axis]: MH Corbin Holding LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate   14.00%    
Amount of Realized Gain/(Loss)   $ 0    
Amount of Unrealized Gain/(Loss)   0    
Amount of Interest, Fees or Dividends Credited to Income   46    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance   1,256    
Gross Additions   0    
Gross Reductions   20    
Ending balance   1,236    
Investment, Identifier [Axis]: Mako Steel, LP, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread [16],[18]     7.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] 0      
Investment, Identifier [Axis]: Mako Steel, LP, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [16]     12.00%  
Spread [16]     7.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] 21,081      
Investment, Identifier [Axis]: Metalforming Holdings, LLC, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 500      
Ending balance [13] $ 540      
Investment, Identifier [Axis]: Metalforming Holdings, LLC, Preferred Equity        
Schedule of Investments [Line Items]        
Total Rate 8.00% [13]   8.00% [11]  
PIK Rate 8.00% [13]   8.00% [11]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] $ 470      
Ending balance [13] 434      
Investment, Identifier [Axis]: Metalforming Holdings, LLC, Secured Debt 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [18] 0      
Ending balance [17] $ 0      
Investment, Identifier [Axis]: Metalforming Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 9.75%   9.75%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 1,513      
Ending balance $ 1,376      
Investment, Identifier [Axis]: Microbe Formulas, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 5.75% [15],[17]   5.75% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (5)      
Ending balance [15],[17] $ (4)      
Investment, Identifier [Axis]: Microbe Formulas, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.17% [15]   10.22% [16]  
Spread 5.75% [15]   5.75% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,342      
Ending balance [15] $ 1,338      
Investment, Identifier [Axis]: Microbe Formulas, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.07% [15]   10.21% [16]  
Spread 5.75% [15]   5.75% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,389      
Ending balance [15] 2,389      
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [24] $ 10,770      
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate [15] 9.79%      
Spread [15] 5.50%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 2,140      
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) 0      
Amount of Interest, Fees or Dividends Credited to Income 35      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Gross Additions 2,140      
Gross Reductions 0      
Ending balance $ 2,140      
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) (396)      
Amount of Interest, Fees or Dividends Credited to Income 0      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 11,166      
Gross Additions 0      
Gross Reductions 396      
Ending balance 10,770      
Investment, Identifier [Axis]: Mini Melts of America, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 280      
Ending balance $ 220      
Investment, Identifier [Axis]: Mini Melts of America, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 10.56% [14],[15]   10.74% [16],[23]  
Spread 6.25% [14],[15]   6.25% [16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[23] $ 375      
Ending balance [14],[15] $ 1,028      
Investment, Identifier [Axis]: Mini Melts of America, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.55% [15],[40]   10.77% [16],[42]  
Spread 6.25% [15],[40]   6.25% [16],[42]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[42] $ 858      
Ending balance [15],[40] $ 826      
Investment, Identifier [Axis]: Mini Melts of America, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 9.56% [15]   9.76% [16]  
Spread 5.25% [15]   5.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 3,201      
Ending balance [15] $ 3,081      
Investment, Identifier [Axis]: Mini Melts of America, LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate 11.56% [15]   11.76% [16]  
Spread 7.25% [15]   7.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 3,201      
Ending balance [15] $ 3,082      
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC, Preferred Member Units        
Schedule of Investments [Line Items]        
Total Rate 12.00% [13]   12.00% [11]  
PIK Rate 12.00% [13]   12.00% [11]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] $ 427      
Ending balance [13] $ 440      
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 14.00%   14.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 2,197      
Ending balance 2,208      
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC, Warrants        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [8] 148      
Ending balance [9] 148      
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 226      
Ending balance $ 141      
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 10.55% [15]   11.59% [16]  
Spread 6.25% [15]   7.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,125      
Ending balance [15] $ 1,172      
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.55% [15]   11.59% [16]  
Spread 6.25% [15]   7.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 3,160      
Ending balance [15] $ 3,284      
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.81% [15]   11.59% [16]  
Spread 6.25% [15]   7.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 5,213      
Ending balance [15] $ 5,201      
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Unsecured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 8.00%   8.00%  
PIK Rate 8.00%   8.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 34      
Ending balance $ 34      
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Unsecured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 8.00%   8.00%  
PIK Rate 8.00%   8.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 15      
Ending balance $ 32      
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Unsecured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 8.00%   8.00%  
PIK Rate 8.00%   8.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 31      
Ending balance 22      
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13] 6,590      
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Secured Debt 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [17] $ 0      
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 1,436      
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10],[25] 11,166      
Investment, Identifier [Axis]: Mystic Logistics 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 236 248    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 6,590 [11] 6,598    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance 6,590 $ 6,598    
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total 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 0 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0 [18] 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 0 $ 0    
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.00% 10.00% 10.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 5    
Amount of Interest, Fees or Dividends Credited to Income 36 36    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,436 1,436    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance 1,436 1,436    
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) 230      
Amount of Interest, Fees or Dividends Credited to Income 43      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,890      
Gross Additions 230      
Gross Reductions 0      
Ending balance [13] $ 4,120      
Investment, Identifier [Axis]: Nello Industries Investco, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 13.50%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 6,629      
Investment, Identifier [Axis]: Nello Industries Investco, LLC, Secured Debt 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 240      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 6,619      
Gross Additions 10      
Gross Reductions 0      
Ending balance 6,629      
Investment, Identifier [Axis]: Nello Industries Investco, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] $ 3,890      
Investment, Identifier [Axis]: Nello Industries Investco, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 6.50%   6.50% [16],[18]  
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 [16],[18] (12)      
Gross Additions 12      
Gross Reductions 0      
Ending balance 0      
Investment, Identifier [Axis]: Nello Industries Investco, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate     13.50%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 6,619      
Investment, Identifier [Axis]: NexRev LLC        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13] 3,350      
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) 380 460    
Amount of Interest, Fees or Dividends Credited to Income 103 26    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 2,970 [11] 1,590    
Gross Additions 380 460    
Gross Reductions 0 0    
Ending balance 3,350 $ 2,050    
Investment, Identifier [Axis]: NexRev LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total 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 0 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0 0    
Gross Additions 0 400    
Gross Reductions 0 0    
Ending balance 0 $ 400    
Investment, Identifier [Axis]: NexRev LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate   10.00% 9.00%  
Amount of Realized Gain/(Loss) 0 $ 0    
Amount of Unrealized Gain/(Loss) (3) 0    
Amount of Interest, Fees or Dividends Credited to Income 38 66    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 2,453 2,435    
Gross Additions 3 4    
Gross Reductions 2,456 0    
Ending balance $ 0 2,439    
Investment, Identifier [Axis]: NinjaTrader, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 6.50% [15],[17]   6.50% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (3)      
Ending balance [15],[17] $ (2)      
Investment, Identifier [Axis]: NinjaTrader, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.96% [15]   11.24% [16]  
Spread 6.50% [15]   6.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 14,436      
Ending balance [15] $ 14,404      
Investment, Identifier [Axis]: Northwind Midstream Partners LLC        
Schedule of Investments [Line Items]        
Total Rate [12],[15] 10.70%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [12],[15] $ 12,254      
Investment, Identifier [Axis]: NuStep, LLC, Designer, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [15],[28] 10.98%      
Spread [15],[28] 6.50%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15],[28] $ 900      
Investment, Identifier [Axis]: NuStep, LLC, Designer, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [28] 12.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [28] $ 4,610      
Investment, Identifier [Axis]: NuStep, LLC, Designer, Preferred Member Units 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 1,500      
Investment, Identifier [Axis]: NuStep, LLC, Designer, Preferred Member Units 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 3,050      
Investment, Identifier [Axis]: NuStep, LLC, Preferred Member Units 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,500      
Investment, Identifier [Axis]: NuStep, LLC, Preferred Member Units 1.1        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 0 0    
Amount of Unrealized Gain/(Loss) 160 240    
Amount of Interest, Fees or Dividends Credited to Income 0 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 2,890 2,310    
Gross Additions 160 240    
Gross Reductions 0 0    
Ending balance 3,050 2,550    
Investment, Identifier [Axis]: NuStep, LLC, Preferred Member Units 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 2,890      
Investment, Identifier [Axis]: NuStep, LLC, Preferred Member Units 2.1        
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 1,500 1,290    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 1,500 $ 1,290    
Investment, Identifier [Axis]: NuStep, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 10.98% 11.98% 11.16% [16]  
Spread 6.50% 6.50% 6.50% [16]  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 25 28    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 900 [16] 899    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 900 $ 899    
Investment, Identifier [Axis]: NuStep, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.00% 12.00% 12.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 139 141    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 4,610 4,606    
Gross Additions 0 1    
Gross Reductions 0 0    
Ending balance $ 4,610 4,607    
Investment, Identifier [Axis]: Obra Capital, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [15] 11.93%      
Spread 7.50% [15]   7.50% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (14)      
Ending balance [15] $ 256      
Investment, Identifier [Axis]: Obra Capital, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.93% [15]   11.97% [16]  
Spread 7.50% [15]   7.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 11,766      
Ending balance [15] $ 11,755      
Investment, Identifier [Axis]: OnPoint Industrial Services, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.30% [15]   11.35% [16]  
Spread 7.00% [15]   7.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,040      
Ending balance [15] $ 1,047      
Investment, Identifier [Axis]: OnPoint Industrial Services, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.30% [15]   11.33% [16]  
Spread 7.00% [15]   7.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,888      
Ending balance [15] 2,910      
Investment, Identifier [Axis]: Oneliance, LLC        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13] 700      
Investment, Identifier [Axis]: Oneliance, 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   0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 640 282    
Gross Additions   0    
Gross Reductions   0    
Ending balance   $ 282    
Investment, Identifier [Axis]: Oneliance, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate   16.48%    
Spread   11.00%    
Amount of Realized Gain/(Loss) 0 $ 0    
Amount of Unrealized Gain/(Loss) 60 7    
Amount of Interest, Fees or Dividends Credited to Income 13 58    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 640 1,339    
Gross Additions 60 9    
Gross Reductions 0 21    
Ending balance 700 1,327    
Investment, Identifier [Axis]: Orttech Holdings, LLC, Preferred Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13],[24] $ 3,360      
Investment, Identifier [Axis]: Orttech Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread [15],[17] 11.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15],[17] $ 0      
Investment, Identifier [Axis]: Orttech Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [15] 15.48%      
Spread [15] 11.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 5,390      
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 (170)    
Amount of Interest, Fees or Dividends Credited to Income 15 15    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,360 [11],[25] 4,260    
Gross Additions 0 0    
Gross Reductions 0 170    
Ending balance $ 3,360 $ 4,090    
Investment, Identifier [Axis]: Orttech Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate   16.48%    
Spread 11.00% 11.00% 11.00% [16],[18]  
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 [16],[18] 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 0 $ 0    
Investment, Identifier [Axis]: Orttech Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 15.48% 16.48% 15.66% [16]  
Spread 11.00% 11.00% 11.00% [16]  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) (6) (6)    
Amount of Interest, Fees or Dividends Credited to Income 215 235    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 5,490 [16] 5,510    
Gross Additions 6 6    
Gross Reductions 106 26    
Ending balance 5,390 5,490    
Investment, Identifier [Axis]: Other Amounts related to investments transferred to or from other 1940 Act classification during the period, Affiliate Investments        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 4,301 0    
Amount of Unrealized Gain/(Loss) (3,611) 0    
Amount of Interest, Fees or Dividends Credited to Income (22) 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance (7,914) 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance 0 0    
Investment, Identifier [Axis]: Other Amounts related to investments transferred to or from other 1940 Act classification during the period, Control Investments        
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]: PTL US Bidco, Inc, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.81% [14],[15]   13.03% [16]  
Spread 8.25% [14],[15]   8.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 443      
Ending balance [14],[15] $ 441      
Investment, Identifier [Axis]: PTL US Bidco, Inc, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.84% [15]   13.03% [16]  
Spread 8.25% [15]   8.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,155      
Ending balance [15] 1,103      
Investment, Identifier [Axis]: Paragon Healthcare, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Spread     11.75%  
Investment, Identifier [Axis]: Peaches Holding Corporation, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,140      
Ending balance $ 410      
Investment, Identifier [Axis]: Pinnacle TopCo, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 13.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 7,160      
Investment, Identifier [Axis]: Pinnacle TopCo, LLC, Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [13] 5,030      
Investment, Identifier [Axis]: Pinnacle TopCo, LLC, Secured Debt 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [17] 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) 440 0    
Amount of Interest, Fees or Dividends Credited to Income 195 79    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 4,590 [11] 3,135    
Gross Additions 440 0    
Gross Reductions 0 0    
Ending balance 5,030 $ 3,135    
Investment, Identifier [Axis]: Pinnacle TopCo, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate   8.00%    
Amount of Realized Gain/(Loss) 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 1 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0 [18] 105    
Gross Additions 0 0    
Gross Reductions 0 59    
Ending balance $ 0 $ 46    
Investment, Identifier [Axis]: Pinnacle TopCo, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 13.00% 13.00% 13.00%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) (9) 0    
Amount of Interest, Fees or Dividends Credited to Income 242 261    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 7,160 7,472    
Gross Additions 9 9    
Gross Reductions 9 0    
Ending balance 7,160 7,481    
Investment, Identifier [Axis]: Power System Solutions, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,640      
Ending balance $ 1,780      
Investment, Identifier [Axis]: Power System Solutions, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 6.50% [15],[17]   6.50% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (27)      
Ending balance [15],[17] $ (25)      
Investment, Identifier [Axis]: Power System Solutions, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.82% [15]   10.86% [16]  
Spread 6.50% [15]   6.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,640      
Ending balance [15] $ 2,633      
Investment, Identifier [Axis]: Power System Solutions, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.82% [15]   10.90% [16]  
Spread 6.50% [15]   6.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 7,859      
Ending balance [15] $ 7,839      
Investment, Identifier [Axis]: PrimeFlight Aviation Services, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 10.58% [15]   10.58% [16]  
Spread 5.50% [15]   5.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 5,910      
Ending balance [15] $ 5,895      
Investment, Identifier [Axis]: PrimeFlight Aviation Services, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 9.83% [15]   9.83% [16]  
Spread 5.50% [15]   5.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 564      
Ending balance [15] $ 563      
Investment, Identifier [Axis]: PrimeFlight Aviation Services, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 9.83% [15]   9.83% [16]  
Spread 5.50% [15]   5.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 567      
Ending balance [15] $ 566      
Investment, Identifier [Axis]: PrimeFlight Aviation Services, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate 9.83% [15]   9.58% [16]  
Spread 5.25% [15]   5.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 644      
Ending balance [15] $ 643      
Investment, Identifier [Axis]: PrimeFlight Aviation Services, Secured Debt 5        
Schedule of Investments [Line Items]        
Total Rate [15] 9.54%      
Spread [15] 5.25%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 1,425      
Investment, Identifier [Axis]: Purge Rite, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 820      
Ending balance 1,560      
Investment, Identifier [Axis]: Purge Rite, LLC, Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,289      
Ending balance $ 1,289      
Investment, Identifier [Axis]: RA Outdoors LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [15] 11.25%      
Spread [15] 6.75%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 1,159      
Investment, Identifier [Axis]: RA Outdoors LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Spread [15],[17] 6.75%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15],[17] $ 0      
Investment, Identifier [Axis]: RA Outdoors LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 0      
Investment, Identifier [Axis]: RA Outdoors LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.25%      
Spread [15] 6.75%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 12,121      
Investment, Identifier [Axis]: RA Outdoors LLC, Common Equity        
Schedule of Investments [Line Items]        
Spread     6.75%  
PIK Rate     11.59%  
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]: RA Outdoors LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.25%   11.74% [16]  
Spread 6.75%   6.75% [16]  
PIK Rate [16]     11.74%  
Amount of Realized Gain/(Loss) $ 0      
Amount of Unrealized Gain/(Loss) (19)      
Amount of Interest, Fees or Dividends Credited to Income 38      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] 1,215      
Gross Additions 1      
Gross Reductions 57      
Ending balance $ 1,159      
Investment, Identifier [Axis]: RA Outdoors LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.25%   11.74% [16]  
Spread 6.75%   6.75% [16]  
PIK Rate [16]     11.74%  
Amount of Realized Gain/(Loss) $ 0      
Amount of Unrealized Gain/(Loss) (199)      
Amount of Interest, Fees or Dividends Credited to Income 394      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] 12,710      
Gross Additions 10      
Gross Reductions 599      
Ending balance $ 12,121      
Investment, Identifier [Axis]: Richardson Sales Solutions, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [16],[23]     11.22%  
Spread 6.50% [14],[15],[17]   6.75% [16],[23]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[23] $ 1,075      
Ending balance [14],[15],[17] $ 0      
Investment, Identifier [Axis]: Richardson Sales Solutions, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.80% [15]   11.38% [16]  
Spread 6.50% [15]   6.75% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 10,288      
Ending balance [15] $ 10,222      
Investment, Identifier [Axis]: Richardson Sales Solutions, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.79% [15]   11.43% [16]  
Spread 6.50% [15]   6.75% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 5,065      
Ending balance [15] 5,033      
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 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 0 $ 0    
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate   12.50%    
PIK Rate 10.00% [7],[17]   10.00% [18],[21]  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 0 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance (7) [18],[21] (6)    
Gross Additions 0 1    
Gross Reductions 1 0    
Ending balance $ (8) [7],[17] $ (5)    
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.50% [7] 12.50% 12.50% [21]  
PIK Rate 10.00% [7]   10.00% [21]  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 (669)    
Amount of Interest, Fees or Dividends Credited to Income 0 123    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,617 [21] 3,421    
Gross Additions 0 4    
Gross Reductions 22 717    
Ending balance 1,595 [7] 2,708    
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc., Secured Debt 3        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 0      
Investment, Identifier [Axis]: Roof Opco, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 8.00% [15],[17]   8.00% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ 0      
Ending balance [15],[17] $ 0      
Investment, Identifier [Axis]: Roof Opco, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.57% [15]   11.85% [16]  
Spread 7.00% [15]   7.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 3,840      
Ending balance [15] $ 3,848      
Investment, Identifier [Axis]: Roof Opco, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 13.57% [15]   13.85% [16]  
Spread 9.00% [15]   9.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 3,815      
Ending balance [15] $ 3,823      
Investment, Identifier [Axis]: Rug Doctor, LLC., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.49% [15]   12.52% [16]  
Spread 8.00% [15]   8.00% [16]  
PIK Rate 2.00% [15]   2.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 6,542      
Ending balance [15] $ 6,575      
Investment, Identifier [Axis]: Rug Doctor, LLC., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.49% [15]   12.52% [16]  
Spread 8.00% [15]   8.00% [16]  
PIK Rate 2.00% [15]   2.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 8,277      
Ending balance [15] 8,087      
Investment, Identifier [Axis]: SI East, LLC, Preferred Member Units        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 0      
Amount of Unrealized Gain/(Loss) (400)      
Amount of Interest, Fees or Dividends Credited to Income 0      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 4,550      
Gross Additions 0      
Gross Reductions 400      
Ending balance [13] $ 4,150      
Investment, Identifier [Axis]: SI East, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.75%      
Amount of Realized Gain/(Loss) $ 0      
Amount of Unrealized Gain/(Loss) 0      
Amount of Interest, Fees or Dividends Credited to Income 24      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 750      
Gross Additions 0      
Gross Reductions 0      
Ending balance 750      
Investment, Identifier [Axis]: SI East, LLC, Secured Debt 2        
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 724      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 22,554      
Gross Additions 2      
Gross Reductions 2      
Ending balance 22,554      
Investment, Identifier [Axis]: SI East, LLC, Preferred Member Units        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] $ 4,550      
Investment, Identifier [Axis]: SI East, 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   39    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance   6,390    
Gross Additions   0    
Gross Reductions   0    
Ending balance   $ 6,390    
Investment, Identifier [Axis]: SI East, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.75% 11.25% 11.75%  
Amount of Realized Gain/(Loss)   $ 0    
Amount of Unrealized Gain/(Loss)   0    
Amount of Interest, Fees or Dividends Credited to Income   13    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 750 375    
Gross Additions   0    
Gross Reductions   0    
Ending balance $ 750 $ 375    
Investment, Identifier [Axis]: SI East, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.82% [44] 12.45% 12.79% [45]  
Amount of Realized Gain/(Loss)   $ 0    
Amount of Unrealized Gain/(Loss)   (9)    
Amount of Interest, Fees or Dividends Credited to Income   584    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 22,554 [45] 18,179    
Gross Additions   9    
Gross Reductions   9    
Ending balance 22,554 [44] 18,179    
Investment, Identifier [Axis]: SPAU Holdings, LLC, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 190      
Ending balance $ 220      
Investment, Identifier [Axis]: SPAU Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [14],[15] 11.96%      
Spread 7.50% [14],[15]   7.50% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ 0      
Ending balance [14],[15] $ 440      
Investment, Identifier [Axis]: SPAU Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.95% [15]   11.98% [16]  
Spread 7.50% [15]   7.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 4,875      
Ending balance [15] 4,862      
Investment, Identifier [Axis]: Slick Innovations, LLC, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [13] 630      
Ending balance [13] $ 490      
Investment, Identifier [Axis]: Slick Innovations, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 14.00%   14.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 4,080      
Ending balance 6,470      
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 62      
Ending balance $ 62      
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 5.25% [15],[17]   5.25% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ 0      
Ending balance [15],[17] $ 0      
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 9.67% [15]   9.71% [16]  
Spread 5.25% [15]   5.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 4,388      
Ending balance [15] 33,214      
Investment, Identifier [Axis]: Student Resource Center, LLC, Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 0      
Investment, Identifier [Axis]: Student Resource Center, 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 0 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 0 $ 0    
Investment, Identifier [Axis]: Student Resource Center, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 8.50%   8.50%  
PIK Rate 8.50% 8.50% 8.50%  
Amount of Realized Gain/(Loss)   $ 0    
Amount of Unrealized Gain/(Loss)   (1,618)    
Amount of Interest, Fees or Dividends Credited to Income   0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 227 3,543    
Gross Additions   0    
Gross Reductions   1,618    
Ending balance $ 980 1,925    
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) (827)      
Amount of Interest, Fees or Dividends Credited to Income 0      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,826      
Gross Additions 0      
Gross Reductions 826      
Ending balance $ 1,000      
Investment, Identifier [Axis]: Student Resource Center, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 8.50% [7]   8.50% [21]  
PIK Rate 8.50% [7]   8.50% [21]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [21] $ 1,826      
Ending balance [7] $ 1,000      
Investment, Identifier [Axis]: Student Resource Center, LLC, Secured Debt 2.1        
Schedule of Investments [Line Items]        
Total Rate 8.50%      
PIK Rate 8.50%      
Amount of Realized Gain/(Loss) $ 0      
Amount of Unrealized Gain/(Loss) 748      
Amount of Interest, Fees or Dividends Credited to Income 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 227      
Gross Additions 753      
Gross Reductions 0      
Ending balance $ 980      
Investment, Identifier [Axis]: TEC Services, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [15] 10.14%      
Spread 5.75% [15]   5.75% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (7)      
Ending balance [15] $ 91      
Investment, Identifier [Axis]: TEC Services, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Spread 5.75% [15],[17]   5.75% [16],[18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] $ (5)      
Ending balance [15],[17] $ (5)      
Investment, Identifier [Axis]: TEC Services, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.13% [15]   10.13% [16]  
Spread 5.75% [15]   5.75% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,299      
Ending balance [15] 2,275      
Investment, Identifier [Axis]: Tedder Industries, LLC, Preferred Member Units 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 0      
Investment, Identifier [Axis]: Tedder Industries, LLC, Preferred Member Units 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 0      
Investment, Identifier [Axis]: Tedder Industries, LLC, Preferred Member Units 3        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 0      
Investment, Identifier [Axis]: Tedder Industries, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [7],[28] 12.00%      
PIK Rate [7],[28] 12.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [7],[28] $ 389      
Investment, Identifier [Axis]: Tedder Industries, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [7],[28] 12.00%      
PIK Rate [7],[28] 12.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [7],[28] $ 802      
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 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance 0 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 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance 0 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 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 0 $ 0    
Investment, Identifier [Axis]: Tedder Industries, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.00% 12.00% 12.00% [21],[22]  
PIK Rate 12.00%   12.00% [21],[22]  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) (23) 0    
Amount of Interest, Fees or Dividends Credited to Income 0 14    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 412 [21],[22] 432    
Gross Additions 0 0    
Gross Reductions 23 0    
Ending balance $ 389 $ 432    
Investment, Identifier [Axis]: Tedder Industries, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.00% 12.00% 12.00% [21],[22]  
PIK Rate 12.00%   12.00% [21],[22]  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) (99) (1,580)    
Amount of Interest, Fees or Dividends Credited to Income 0 115    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 901 [21],[22] 3,565    
Gross Additions 0 0    
Gross Reductions 99 1,580    
Ending balance 802 1,985    
Investment, Identifier [Axis]: Tex Tech Tennis, LLC, Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10],[25] 2,290      
Ending balance [12],[24] 2,290      
Investment, Identifier [Axis]: The Affiliati Network, LLC, Preferred Stock 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] 72      
Ending balance [13] 78      
Investment, Identifier [Axis]: The Affiliati Network, LLC, Preferred Stock 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] 1,600      
Ending balance [13] $ 1,600      
Investment, Identifier [Axis]: The Affiliati Network, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 10.00%   10.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 98      
Ending balance $ 29      
Investment, Identifier [Axis]: The Affiliati Network, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.00%   10.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 1,274      
Ending balance $ 1,277      
Investment, Identifier [Axis]: Titan Meter Midco Corp., Preferred Equity        
Schedule of Investments [Line Items]        
Total Rate 8.00%   8.00%  
PIK Rate 8.00%   8.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 540      
Ending balance $ 540      
Investment, Identifier [Axis]: Titan Meter Midco Corp., Secured Debt 1        
Schedule of Investments [Line Items]        
Spread 6.50% [15],[17]   6.50% [18]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [18] $ (40)      
Ending balance [15],[17] $ (38)      
Investment, Identifier [Axis]: Titan Meter Midco Corp., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.80% [15]   10.83% [16]  
Spread 6.50% [15]   6.50% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 13,049      
Ending balance [15] $ 13,049      
Investment, Identifier [Axis]: Titan Meter Midco Corp., Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate [15] 10.80%      
Spread [15] 6.50%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 1,665      
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) 0 (280)    
Amount of Interest, Fees or Dividends Credited to Income 7 7    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 2,140 [11] 3,180    
Gross Additions 0 0    
Gross Reductions 0 280    
Ending balance 2,140 [13] $ 2,900    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate   11.50%    
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) [18] 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ (1) [17] $ 0    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 13.50% 13.50% 13.50%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 18    
Amount of Interest, Fees or Dividends Credited to Income 69 64    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,962 1,980    
Gross Additions 1 0    
Gross Reductions 0 0    
Ending balance $ 1,963 1,980    
Investment, Identifier [Axis]: U.S. TelePacific Corp., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.90% [7],[15]   11.90% [16],[21]  
Spread 7.40% [7],[15]   7.40% [16],[21]  
PIK Rate 6.00% [7],[15]   6.00% [16],[21]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[21] $ 2,686      
Ending balance [7],[15] 2,700      
Investment, Identifier [Axis]: U.S. TelePacific Corp., Secured Debt 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [21] 0      
Ending balance [7] 0      
Investment, Identifier [Axis]: UPS Intermediate, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 412      
Ending balance $ 380      
Investment, Identifier [Axis]: UPS Intermediate, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 10.57% [15]   10.36% [16]  
Spread 6.25% [15]   6.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 19,294      
Ending balance [15] $ 19,115      
Investment, Identifier [Axis]: Urgent DSO LLC, Preferred Equity        
Schedule of Investments [Line Items]        
Total Rate 9.00% [13]   9.00% [11]  
PIK Rate 9.00% [13]   9.00% [11]  
Amount of Realized Gain/(Loss) $ 0      
Amount of Unrealized Gain/(Loss) 0      
Amount of Interest, Fees or Dividends Credited to Income 24      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] 1,080      
Gross Additions 24      
Gross Reductions 0      
Ending balance [13] $ 1,104      
Investment, Identifier [Axis]: Urgent DSO LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 13.50%   13.50%  
Amount of Realized Gain/(Loss) $ 0      
Amount of Unrealized Gain/(Loss) 0      
Amount of Interest, Fees or Dividends Credited to Income 78      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 2,145      
Gross Additions 3      
Gross Reductions 0      
Ending balance $ 2,148      
Investment, Identifier [Axis]: UserZoom Technologies, Inc., Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 11.80% [12],[15]   12.75% [10],[16]  
Spread 7.50% [12],[15]   7.50% [10],[16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10],[16] $ 3,000      
Ending balance [12],[15] 3,000      
Investment, Identifier [Axis]: VORTEQ Coil Finishers, LLC, Common Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [10],[11] 1,950      
Ending balance [12],[13] 1,950      
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 25 25    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,060 [11],[25] 3,060    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 3,060 [13],[24] $ 3,060    
Investment, Identifier [Axis]: VVS Holdco LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate   11.48%    
Spread 6.00% [15],[17] 6.00% 6.00% [16],[18]  
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 0 [16],[18] 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 0 [15],[17] $ 0    
Investment, Identifier [Axis]: VVS Holdco LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.50% 11.50% 11.50%  
Amount of Realized Gain/(Loss) $ 0 $ 0    
Amount of Unrealized Gain/(Loss) 0 0    
Amount of Interest, Fees or Dividends Credited to Income 195 216    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 6,366 6,926    
Gross Additions 9 11    
Gross Reductions 0 0    
Ending balance 6,375 6,937    
Investment, Identifier [Axis]: Victory Energy Operations, 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 19      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,644      
Gross Additions 0      
Gross Reductions 0      
Ending balance [13] 3,644      
Investment, Identifier [Axis]: Victory Energy Operations, 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 [18] (5)      
Gross Additions 0      
Gross Reductions 0      
Ending balance [17] $ (5)      
Investment, Identifier [Axis]: Victory Energy Operations, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 13.00%   13.00%  
Amount of Realized Gain/(Loss) $ 0      
Amount of Unrealized Gain/(Loss) 0      
Amount of Interest, Fees or Dividends Credited to Income 263      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 7,529      
Gross Additions 11      
Gross Reductions 0      
Ending balance $ 7,540      
Investment, Identifier [Axis]: Vitesse Systems, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.44% [14]   11.55%  
Spread 7.00% [14]   7.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 1,705      
Ending balance [14] $ 2,045      
Investment, Identifier [Axis]: Vitesse Systems, Secured Debt 1, Secured Overnight Financing Rate        
Schedule of Investments [Line Items]        
Spread 4.00%      
Investment, Identifier [Axis]: Vitesse Systems, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.44% [15]   11.47% [16]  
Spread 7.00% [15]   7.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 12,375      
Ending balance [15] 12,344      
Investment, Identifier [Axis]: Volusion, LLC, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 0      
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 2,220      
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance 0      
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 3        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 0      
Investment, Identifier [Axis]: Volusion, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 10.00%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance $ 900      
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 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance 0 0    
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 1        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,004      
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 1.1        
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]: Volusion, LLC, Preferred Member Units 2        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 0      
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units 2.1        
Schedule of Investments [Line Items]        
Amount of Realized Gain/(Loss) 9 0    
Amount of Unrealized Gain/(Loss) (654) 435    
Amount of Interest, Fees or Dividends Credited to Income 0 0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 3,004 3,110    
Gross Additions 10 435    
Gross Reductions 794 435    
Ending balance 2,220 3,110    
Investment, Identifier [Axis]: Volusion, 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 0    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance $ 0 $ 0    
Investment, Identifier [Axis]: Volusion, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 10.00% 10.00% 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 23 23    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 900 900    
Gross Additions 0 0    
Gross Reductions 0 0    
Ending balance 900 $ 900    
Investment, Identifier [Axis]: Wall Street Prep, Inc., Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance 1,510      
Investment, Identifier [Axis]: Wall Street Prep, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Spread [16],[18]     7.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[18] (3)      
Investment, Identifier [Axis]: Wall Street Prep, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [16]     11.74%  
Spread [16]     7.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,199      
Investment, Identifier [Axis]: Watterson Brands, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.00%   12.00%  
PIK Rate 4.00%   4.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 292      
Ending balance $ 294      
Investment, Identifier [Axis]: Watterson Brands, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.00%   12.00%  
PIK Rate 4.00%   4.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 50      
Ending balance $ 51      
Investment, Identifier [Axis]: Watterson Brands, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 12.00%   12.00%  
PIK Rate 4.00%   4.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 2,076      
Ending balance $ 2,091      
Investment, Identifier [Axis]: Watterson Brands, LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate 12.00%   12.00%  
PIK Rate 4.00%   4.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 1,874      
Ending balance 1,886      
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC, Common Stock        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] 640      
Ending balance [13] $ 640      
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 9.32% [15],[40]   9.47% [16]  
Spread 5.00% [15],[40]   5.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 658      
Ending balance [15],[40] $ 3,343      
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 9.32% [15]   9.60% [16]  
Spread 5.00% [15]   5.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,917      
Ending balance [15] $ 14,815      
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 9.32% [15]   9.60% [16]  
Spread 5.00% [15]   5.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,452      
Ending balance [15] $ 7,373      
Investment, Identifier [Axis]: Winter Services LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.56% [14],[15]   12.81% [16]  
Spread 8.00% [14],[15]   8.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,672      
Ending balance [14],[15] $ 3,273      
Investment, Identifier [Axis]: Winter Services LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.57% [15]   12.85% [16]  
Spread 8.00% [15]   8.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,276      
Ending balance [15] $ 2,300      
Investment, Identifier [Axis]: Winter Services LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.57% [15]   11.85% [16]  
Spread 7.00% [15]   7.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 8,794      
Ending balance [15] $ 8,885      
Investment, Identifier [Axis]: Winter Services LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate 13.57% [15]   13.85% [16]  
Spread 9.00% [15]   9.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 8,794      
Ending balance [15] 8,885      
Investment, Identifier [Axis]: World Micro Holdings, LLC, Preferred Equity        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [11] 530      
Ending balance [13] $ 530      
Investment, Identifier [Axis]: World Micro Holdings, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 11.00%   13.00%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance $ 1,468      
Ending balance $ 1,350      
Investment, Identifier [Axis]: Xenon Arc, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 9.65% [15]   9.70% [16]  
Spread 5.25% [15]   5.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 1,176      
Ending balance [15] $ 1,173      
Investment, Identifier [Axis]: Xenon Arc, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 9.64% [15]   9.98% [16]  
Spread 5.25% [15]   5.25% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 2,328      
Ending balance [15] $ 2,322      
Investment, Identifier [Axis]: Xenon Arc, Inc., Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate [15] 10.15%      
Spread [15] 5.75%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 608      
Investment, Identifier [Axis]: YS Garments, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 11.90% [15],[33]   12.25% [16],[43]  
Spread 7.50% [15],[33]   7.50% [16],[43]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16],[43] $ 4,661      
Ending balance [15],[33] $ 4,411      
Investment, Identifier [Axis]: ZRG Partners, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.50% [15]   12.50% [16]  
Spread 5.00% [15]   5.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 86      
Ending balance [15] $ 691      
Investment, Identifier [Axis]: ZRG Partners, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.27% [15],[40]   10.74% [16]  
Spread 6.00% [15],[40]   6.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 517      
Ending balance [15],[40] $ 1,000      
Investment, Identifier [Axis]: ZRG Partners, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.28% [15]   10.28% [16]  
Spread 6.00% [15]   6.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 817      
Ending balance [15] $ 815      
Investment, Identifier [Axis]: ZRG Partners, LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate 10.30% [15]   10.66% [16]  
Spread 6.00% [15]   6.00% [16]  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 5,852      
Ending balance [15] 5,835      
Investment, Identifier [Axis]: Zips Car Wash, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [16]     11.91%  
Spread [16]     7.25%  
PIK Rate [16]     11.91%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] 2,025      
Investment, Identifier [Axis]: Zips Car Wash, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [16]     11.91%  
Spread [16]     7.25%  
PIK Rate [16]     11.91%  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance [16] $ 508      
Investment, Identifier [Axis]: Zips Car Wash, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate [7],[15],[28] 11.91%      
Spread [7],[15],[28] 7.25%      
PIK Rate [7],[15],[28] 11.91%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [7],[15],[28] $ 1,543      
Investment, Identifier [Axis]: Zips Car Wash, LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate [7],[15],[28] 11.91%      
Spread [7],[15],[28] 7.25%      
PIK Rate [7],[15],[28] 11.91%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [7],[15],[28] $ 387      
Investment, Identifier [Axis]: Zips Car Wash, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [15] 11.70%      
Spread [15] 7.25%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 132      
Investment, Identifier [Axis]: Zips Car Wash, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [15] 11.70%      
Spread [15] 7.25%      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Ending balance [15] $ 230      
[1] 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.
[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] 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.
[4] 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.
[5] 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.
[6] 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.
[7] Non-accrual and non-income producing debt investment.
[8] Warrants are presented in equivalent shares/units with a strike price of $0.01 per share/unit.
[9] Warrants are presented in equivalent shares/units with a strike price of $0.01 per share/unit.
[10] Private Loan portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Private Loan portfolio investments.
[11] Income producing through dividends or distributions.
[12] Private Loan portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Private Loan portfolio investments.
[13] Income producing through dividends or distributions.
[14] RLOC 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, 2025.
[15] Index based floating interest rate is subject to contractual minimum interest rate. As noted in this schedule, 97% of the loans (based on the par amount) contain Secured Overnight Financing Rate (“SOFR”) floors which range between 0.75% and 5.25%, with a weighted-average floor of 1.32%.
[16] 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 0.75% and 5.25%, with a weighted-average floor of 1.28%.
[17] The position is unfunded and no interest income is being earned as of March 31, 2025. The position may earn a nominal unused facility fee on committed amounts.
[18] The position is unfunded and no interest income is being earned as of December 31, 2024. The position may earn a nominal unused facility fee on committed amounts.
[19] Index based floating interest rate is subject to contractual maximum base rate of 3.00%.
[20] Index based floating interest rate is subject to contractual maximum base rate of 3.00%.
[21] Non-accrual and non-income producing debt investment.
[22] Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
[23] RLOC 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, 2024.
[24] Shares/Units represent ownership in a related Real Estate or HoldCo entity.
[25] Shares/Units represent ownership in a related Real Estate or HoldCo entity.
[26] Investment is not unitized. Presentation is made in percent of fully diluted ownership unless otherwise indicated.
[27] Investment is not unitized. Presentation is made in percent of fully diluted ownership unless otherwise indicated.
[28] Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
[29] 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.
[30] Other Portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Other Portfolio investments.
[31] 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.
[32] Other Portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Other Portfolio investments.
[33] Middle Market portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Middle Market portfolio investments.
[34] Effective yield as of December 31, 2024 was approximately 4.13% on the Fidelity Government Portfolio Fund Class III.
[35] Effective yield as of March 31, 2025 was approximately 3.98% on the Fidelity Government Portfolio Fund Class III.
[36] Effective yield as of December 31, 2024 was approximately 4.41% on the First American Treasury Obligations Fund Class Z
[37] Effective yield as of March 31, 2025 was approximately 4.21% on the First American Treasury Obligations Fund Class Z.
[38] Index based floating interest rate is subject to contractual maximum base rate of 4.00%.
[39] Index based floating interest rate is subject to contractual maximum base rate of 4.00%
[40] 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, 2025.
[41] Investment is accruing income at the fixed cash rate of 2.50% as of March 31, 2025.
[42] 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, 2024.
[43] Middle Market portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Middle Market portfolio investments.
[44] 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 11.75% per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.
[45] 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 11.75% per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.