v3.26.1
Consolidated Schedule of Investments In and Advances to Affiliates (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Schedule of Investments [Line Items]          
PIK Rate 15.00%   15.00%    
Amount of Realized Gain/(Loss) $ 9,857 $ 4,779 $ 9,616 $ (16,287)  
Amount of Unrealized Gain/(Loss) 9,104 (3,904) 6,461 14,879  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1]     1,335,387    
Ending balance [2],[3],[4] 1,389,403   1,389,403    
Control investments:          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss) 0 5,296 0 5,305  
Amount of Unrealized Gain/(Loss) (1,529) (5,068) (5,981) (5,901)  
Amount of Interest, Fees or Dividends Credited to Income     2,227 2,956  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     58,372 [1],[5] 69,878  
Gross Additions     687 4,652  
Gross Reductions     6,439 12,918  
Ending balance 52,620 [3],[6] 61,612 52,620 [3],[6] 61,612  
Affiliate investments:          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss) 11,595 2 9,939 2  
Amount of Unrealized Gain/(Loss) (1,459) (69) 6,964 2,767  
Amount of Interest, Fees or Dividends Credited to Income     18,849 18,952  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     406,771 [1],[7] 351,360  
Gross Additions     73,696 48,733  
Gross Reductions     61,640 24,183  
Ending balance 418,827 [3],[8] 383,824 418,827 [3],[8] 383,824  
Investment, Identifier [Axis]: AAC Holdings, Inc. | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10]     0    
Ending balance [3],[11],[12] 0   0    
Investment, Identifier [Axis]: AAC Holdings, Inc. | Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10]     720    
Ending balance [3],[11],[12] $ 0   $ 0    
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 21.00% [11],[12]   21.00% [11],[12]   20.00% [9],[10]
PIK Rate 21.00% [11],[12],[13]   21.00% [11],[12],[13]   20.00% [9],[10],[14]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10]     $ 308    
Ending balance [3],[11],[12] $ 469   $ 469    
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 21.00% [11],[12]   21.00% [11],[12]   21.00% [9],[10]
PIK Rate 21.00% [11],[12],[13]   21.00% [11],[12],[13]   21.00% [9],[10],[14]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10]     $ 173    
Ending balance [3],[11],[12] $ 393   $ 393    
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 20.00% [11],[12]   20.00% [11],[12]   20.00% [9],[10],[15]
PIK Rate 20.00% [11],[12],[13]   20.00% [11],[12],[13]   20.00% [9],[10],[14],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[15]     $ 948    
Ending balance [3],[11],[12] $ 340   $ 340    
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 20.00% [11],[12],[16]   20.00% [11],[12],[16]   20.00% [9],[10],[15]
PIK Rate 20.00% [11],[12],[13],[16]   20.00% [11],[12],[13],[16]   20.00% [9],[10],[14],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[15]     $ 948    
Ending balance [3],[11],[12],[16] $ 476   $ 476    
Investment, Identifier [Axis]: AAC Holdings, Inc. | Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate [11],[12],[16] 20.00%   20.00%    
PIK Rate [11],[12],[13],[16] 20.00%   20.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[11],[12],[16] $ 476   $ 476    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC | Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     1,000    
Ending balance [3],[12],[18] $ 780   $ 780    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.50% [12],[18],[19],[20],[21]   5.50% [12],[18],[19],[20],[21]   5.50% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (47)    
Ending balance [3],[12],[18],[20],[21] $ (43)   $ (43)    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Spread 5.50% [12],[18],[19],[20],[21]   5.50% [12],[18],[19],[20],[21]   5.50% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (27)    
Ending balance [3],[12],[18],[20],[21] $ (24)   $ (24)    
Investment, Identifier [Axis]: AGS American Glass Services Acquisition, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.16% [12],[18],[21]   9.16% [12],[18],[21]   9.22% [10],[17],[24]
Spread 5.50% [12],[18],[19],[21]   5.50% [12],[18],[19],[21]   5.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 13,440    
Ending balance [3],[12],[18],[21] $ 12,453   12,453    
Investment, Identifier [Axis]: AMEREQUIP LLC | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[25]     0    
Ending balance [3],[12],[18],[26] 0   0    
Investment, Identifier [Axis]: ATS Operating, LLC | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     140    
Ending balance [3],[12],[18] $ 140   $ 140    
Investment, Identifier [Axis]: ATS Operating, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.95% [12],[18],[21],[27]   9.95% [12],[18],[21],[27]   10.22% [10],[17],[24],[28]
Spread 6.00% [12],[18],[19],[21],[27]   6.00% [12],[18],[19],[21],[27]   6.00% [10],[17],[22],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[28]     $ 250    
Ending balance [3],[12],[18],[21],[27] $ 200   $ 200    
Investment, Identifier [Axis]: ATS Operating, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 8.95% [12],[18],[21]   8.95% [12],[18],[21]   9.25% [10],[17],[24]
Spread 5.00% [12],[18],[19],[21]   5.00% [12],[18],[19],[21]   5.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 925    
Ending balance [3],[12],[18],[21] $ 925   $ 925    
Investment, Identifier [Axis]: ATS Operating, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.95% [12],[18],[21]   10.95% [12],[18],[21]   11.25% [10],[17],[24]
Spread 7.00% [12],[18],[19],[21]   7.00% [12],[18],[19],[21]   7.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 925    
Ending balance [3],[12],[18],[21] $ 925   925    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[25]     128    
Ending balance [3],[12],[18] $ 168   $ 168    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 7.25% [12],[18],[19],[20],[21]   7.25% [12],[18],[19],[20],[21]   7.25% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (9)    
Ending balance [3],[12],[18],[20],[21] $ (7)   $ (7)    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[24]         11.09%
Spread 7.25% [12],[18],[19],[20],[21]   7.25% [12],[18],[19],[20],[21]   7.25% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 3,257    
Ending balance [3],[12],[18],[20],[21] $ (4)   $ (4)    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21] 11.14%   11.14%    
Spread 7.25% [12],[18],[19],[21]   7.25% [12],[18],[19],[21]   7.25% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (5)    
Ending balance [3],[12],[18],[21] $ 3,214   $ 3,214    
Investment, Identifier [Axis]: Adams Publishing Group, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.00% [12],[18],[21],[29]   11.00% [12],[18],[21],[29]   11.00% [10],[17],[24],[30]
Spread 8.00% [12],[18],[19],[21],[29]   8.00% [12],[18],[19],[21],[29]   7.00% [10],[17],[22],[24],[30]
PIK Rate 1.00% [12],[13],[18],[21],[29]   1.00% [12],[13],[18],[21],[29]   1.00% [10],[14],[17],[24],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[30]     $ 951    
Ending balance [3],[12],[18],[21],[29] $ 1,143   $ 1,143    
Investment, Identifier [Axis]: Adams Publishing Group, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.00% [12],[18],[21]   11.00% [12],[18],[21]   11.00% [10],[17],[24]
Spread 8.00% [12],[18],[19],[21]   8.00% [12],[18],[19],[21]   7.00% [10],[17],[22],[24]
PIK Rate 1.00% [12],[13],[18],[21]   1.00% [12],[13],[18],[21]   1.00% [10],[14],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 93    
Ending balance [3],[12],[18],[21] $ 89   $ 89    
Investment, Identifier [Axis]: Adams Publishing Group, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 11.00% [12],[18],[21],[29]   11.00% [12],[18],[21],[29]   11.00% [10],[17],[24],[30]
Spread 8.00% [12],[18],[19],[21],[29]   8.00% [12],[18],[19],[21],[29]   7.00% [10],[17],[22],[24],[30]
PIK Rate 1.00% [12],[13],[18],[21],[29]   1.00% [12],[13],[18],[21],[29]   1.00% [10],[14],[17],[24],[30]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[30]     $ 1,959    
Ending balance [3],[12],[18],[21],[29] $ 1,816   1,816    
Investment, Identifier [Axis]: Airo Purchaser, Inc. | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     1,233    
Ending balance [3],[12],[18] $ 1,340   $ 1,340    
Investment, Identifier [Axis]: Airo Purchaser, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.25% [12],[18],[19],[20],[21]   5.25% [12],[18],[19],[20],[21]   5.25% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (51)    
Ending balance [3],[12],[18],[20],[21] $ (46)   $ (46)    
Investment, Identifier [Axis]: Airo Purchaser, Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Spread 5.25% [12],[18],[19],[20],[21]   5.25% [12],[18],[19],[20],[21]   5.25% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (26)    
Ending balance [3],[12],[18],[20],[21] $ (23)   $ (23)    
Investment, Identifier [Axis]: Airo Purchaser, Inc. | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 8.91% [12],[18],[21]   8.91% [12],[18],[21]   9.22% [10],[17],[24]
Spread 5.25% [12],[18],[19],[21]   5.25% [12],[18],[19],[21]   5.25% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 22,110    
Ending balance [3],[12],[18],[21] $ 22,263   $ 22,263    
Investment, Identifier [Axis]: American Health Staffing Group, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.25% [12],[18],[19],[20],[21]   5.25% [12],[18],[19],[20],[21]   5.00% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (3)    
Ending balance [3],[12],[18],[20],[21] $ (2)   $ (2)    
Investment, Identifier [Axis]: American Health Staffing Group, Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.00% [12],[18],[21]   12.00% [12],[18],[21]   11.75% [10],[17],[24]
Spread 5.25% [12],[18],[19],[21]   5.25% [12],[18],[19],[21]   5.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 7,000    
Ending balance [3],[12],[18],[21] $ 6,720   6,720    
Investment, Identifier [Axis]: American Nuts, LLC | Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (130) (336)  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,210 [1],[7],[17] 0  
Gross Additions     0 2,556  
Gross Reductions     130 336  
Ending balance $ 1,080 [3],[8],[18] $ 2,220 $ 1,080 [3],[8],[18] $ 2,220  
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.34% [8],[18],[21] 12.95% 12.34% [8],[18],[21] 12.95% 12.64% [7],[17],[24]
Spread 8.50% [8],[18],[19],[21] 8.50% 8.50% [8],[18],[19],[21] 8.50% 8.50% [7],[17],[22],[24]
PIK Rate 12.34% [8],[13],[18],[21] 12.95% 12.34% [8],[13],[18],[21] 12.95% 12.64% [7],[14],[17],[24]
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       72  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 2,325 [1],[7],[17],[24] 0  
Gross Additions       2,180  
Gross Reductions       0  
Ending balance $ 91 [3],[8],[18],[21] $ 2,180 $ 91 [3],[8],[18],[21] $ 2,180  
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 1.1          
Schedule of Investments [Line Items]          
Total Rate 12.34%   12.34%    
Spread 8.50%   8.50%    
PIK Rate 12.34%   12.34%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     146    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,325    
Gross Additions     147    
Gross Reductions     0    
Ending balance $ 2,472   $ 2,472    
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.34% [8],[18],[21] 12.95% 12.34% [8],[18],[21] 12.95% 12.64% [7],[17],[24]
Spread 8.50% [8],[18],[19],[21] 8.50% 8.50% [8],[18],[19],[21] 8.50% 8.50% [7],[17],[22],[24]
PIK Rate 12.34% [8],[13],[18],[21] 12.95% 12.34% [8],[13],[18],[21] 12.95% 12.64% [14],[17],[24]
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       72  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 1,875 [1],[7],[17],[24] 0  
Gross Additions       2,180  
Gross Reductions       0  
Ending balance $ 2,472 [3],[8],[18],[21] $ 2,180 $ 2,472 [3],[8],[18],[21] 2,180  
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 2.1          
Schedule of Investments [Line Items]          
Total Rate 12.34%   12.34%    
Spread 8.50%   8.50%    
PIK Rate 12.34%   12.34%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     31    
Amount of Interest, Fees or Dividends Credited to Income     146    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,875    
Gross Additions     178    
Gross Reductions     0    
Ending balance $ 2,053   $ 2,053    
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [8],[18],[21] 12.34%   12.34%    
Spread [8],[18],[19],[21] 8.50%   8.50%    
PIK Rate [8],[13],[18],[21] 12.34%   12.34%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[8],[18],[21] $ 2,053   $ 2,053    
Investment, Identifier [Axis]: American Nuts, LLC | Secured Debt 3.1          
Schedule of Investments [Line Items]          
Total Rate 12.34%   12.34%    
Spread 8.50%   8.50%    
PIK Rate 12.34%   12.34%    
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     91    
Gross Reductions     0    
Ending balance $ 91   91    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Preferred Member Units 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,510 [1],[7] 0  
Gross Additions       0  
Gross Reductions       0  
Ending balance 1,510 [3],[8] 0 1,510 [3],[8] 0  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Preferred Member Units 1.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     120    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     30    
Gross Additions     120    
Gross Reductions     0    
Ending balance 150   150    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Preferred Member Units 2          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     30 [1],[7] 1,330  
Gross Additions       0  
Gross Reductions       0  
Ending balance 150 [3],[8] 1,330 150 [3],[8] 1,330  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Preferred Member Units 2.1          
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     1,510    
Gross Additions     0    
Gross Reductions     0    
Ending balance $ 1,510   $ 1,510    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 13.25% [8]   13.25% [8]   13.75% [7]
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     64    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7]     965    
Gross Additions     2    
Gross Reductions     51    
Ending balance [3],[8] $ 916   916    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       0  
Gross Additions       0  
Gross Reductions       0  
Ending balance   $ 0   $ 0  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate   17.50%   17.50%  
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       90  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       1,012  
Gross Additions       2  
Gross Reductions       26  
Ending balance   $ 988   988  
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 [1],[7],[31] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 0 [3],[8],[32] 0 0 [3],[8],[32] 0  
Investment, Identifier [Axis]: ArborWorks, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     0    
Ending balance [3],[12],[18] 0   0    
Investment, Identifier [Axis]: ArborWorks, LLC | Preferred Equity 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     8,848    
Ending balance [3],[12],[18] 9,748   9,748    
Investment, Identifier [Axis]: ArborWorks, LLC | Preferred Equity 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     0    
Ending balance [3],[12],[18] $ 0   $ 0    
Investment, Identifier [Axis]: ArborWorks, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 15.00% [12],[18]   15.00% [12],[18]   15.00% [10],[17]
PIK Rate 15.00% [12],[13],[18]   15.00% [12],[13],[18]   15.00% [10],[14],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     $ 2,218    
Ending balance [3],[12],[18] $ 2,392   $ 2,392    
Investment, Identifier [Axis]: ArborWorks, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.24% [12],[18],[21]   10.24% [12],[18],[21]   10.34% [10],[17],[24]
Spread 6.50% [12],[18],[19],[21]   6.50% [12],[18],[19],[21]   6.50% [10],[17],[22],[24]
PIK Rate 10.24% [12],[13],[18],[21]   10.24% [12],[13],[18],[21]   10.34% [10],[14],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 4,772    
Ending balance [3],[12],[18],[21] $ 5,023   5,023    
Investment, Identifier [Axis]: Archer Systems, LLC | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[25]     110    
Ending balance [3],[12],[18],[26] 110   110    
Investment, Identifier [Axis]: Auria Space, LLC | Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18] $ 690   $ 690    
Investment, Identifier [Axis]: Auria Space, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.00% [12],[18],[19],[20],[21]   5.00% [12],[18],[19],[20],[21]   5.00% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (38)    
Ending balance [3],[12],[18],[20],[21] $ (34)   $ (34)    
Investment, Identifier [Axis]: Auria Space, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21] 8.64%   8.64%    
Spread 5.00% [12],[18],[19],[21]   5.00% [12],[18],[19],[21]   5.00% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (68)    
Ending balance [3],[12],[18],[21] $ 13,793   $ 13,793    
Investment, Identifier [Axis]: Auria Space, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 8.64% [12],[18],[21]   8.64% [12],[18],[21]   8.72% [10],[17],[24]
Spread 5.00% [12],[18],[19],[21]   5.00% [12],[18],[19],[21]   5.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 12,740    
Ending balance [3],[12],[18],[21] $ 12,931   12,931    
Investment, Identifier [Axis]: B-O-F Corporation | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     180    
Ending balance [3],[12],[18] $ 180   $ 180    
Investment, Identifier [Axis]: B-O-F Corporation | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.75% [12],[18],[19],[20],[21]   5.75% [12],[18],[19],[20],[21]   5.75% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (12)    
Ending balance [3],[12],[18],[20],[21] $ (11)   $ (11)    
Investment, Identifier [Axis]: B-O-F Corporation | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 8.44% [12],[18],[21]   8.44% [12],[18],[21]   8.74% [10],[17],[24]
Spread 4.75% [12],[18],[19],[21]   4.75% [12],[18],[19],[21]   4.75% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 2,831    
Ending balance [3],[12],[18],[21] $ 2,836   $ 2,836    
Investment, Identifier [Axis]: B-O-F Corporation | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.44% [12],[18],[21]   10.44% [12],[18],[21]   10.74% [10],[17],[24]
Spread 6.75% [12],[18],[19],[21]   6.75% [12],[18],[19],[21]   6.75% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 2,831    
Ending balance [3],[12],[18],[21] $ 2,836   2,836    
Investment, Identifier [Axis]: BDB Holdings, LLC | Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (4,130) (700)  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     8,430 [1],[5] 12,610  
Gross Additions     0 0  
Gross Reductions     4,130 700  
Ending balance $ 4,300 [3],[6] $ 11,910 $ 4,300 [3],[6] $ 11,910  
Investment, Identifier [Axis]: BDB Holdings, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 12.00% [6] 12.00% 12.00% [6] 12.00% 12.00% [5]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     88 10  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,182 [1],[5] 0  
Gross Additions     534 280  
Gross Reductions     0 0  
Ending balance $ 1,716 [3],[6] $ 280 1,716 [3],[6] 280  
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     3,790    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[24],[28]         9.75%
Spread [10],[17],[22],[24],[28]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[28]     1,024    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[24]         9.84%
Spread [10],[17],[22],[24]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     1,279    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[24]         9.75%
Spread [10],[17],[22],[24]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     11,003    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[24]         9.83%
Spread [10],[17],[22],[24]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     0    
Investment, Identifier [Axis]: BP Loenbro Holdings Inc. | Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[24]         9.84%
Spread [10],[17],[22],[24]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     4,219    
Investment, Identifier [Axis]: Barfly Ventures, LLC | Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       317  
Amount of Interest, Fees or Dividends Credited to Income       368  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       1,953  
Gross Additions       317  
Gross Reductions       0  
Ending balance   2,270   2,270  
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)     80 200  
Amount of Interest, Fees or Dividends Credited to Income     85 39  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     970 [1],[7],[25] 570  
Gross Additions     80 200  
Gross Reductions     0 0  
Ending balance $ 1,050 [3],[8],[26] 770 $ 1,050 [3],[8],[26] 770  
Investment, Identifier [Axis]: Batjer TopCo, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 10.00%   10.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     (2)    
Amount of Interest, Fees or Dividends Credited to Income     57    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,105    
Gross Additions     2    
Gross Reductions     14    
Ending balance $ 1,093   1,093    
Investment, Identifier [Axis]: Batjer TopCo, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7],[23] 50  
Gross Additions       0  
Gross Reductions       50  
Ending balance 0 [3],[8],[20] $ 0 0 [3],[8],[20] $ 0  
Investment, Identifier [Axis]: Batjer TopCo, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate   10.00%   10.00%  
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       2  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7],[23] 30  
Gross Additions       0  
Gross Reductions       0  
Ending balance $ 0 [3],[8],[20] $ 30 $ 0 [3],[8],[20] $ 30  
Investment, Identifier [Axis]: Batjer TopCo, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.00% [8] 10.00% 10.00% [8] 10.00% 10.00% [7]
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       64  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 1,105 [1],[7] 1,165  
Gross Additions       2  
Gross Reductions       0  
Ending balance $ 1,093 [3],[8] $ 1,167 1,093 [3],[8] 1,167  
Investment, Identifier [Axis]: Behavior Development Group Holdings | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     500    
Ending balance [3],[12],[18] $ 500   $ 500    
Investment, Identifier [Axis]: Behavior Development Group Holdings | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21] 9.69%   9.69%    
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   6.00% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (37)    
Ending balance [3],[12],[18],[21] $ 1,500   $ 1,500    
Investment, Identifier [Axis]: Behavior Development Group Holdings | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.73% [12],[18],[21]   9.73% [12],[18],[21]   9.70% [10],[17],[24]
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   6.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 15,757    
Ending balance [3],[12],[18],[21] $ 15,913   15,913    
Investment, Identifier [Axis]: Berry Aviation, Inc. | Preferred Member Units 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[33]     0    
Ending balance [3],[12],[18],[34] 347   347    
Investment, Identifier [Axis]: Berry Aviation, Inc. | Preferred Member Units 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[33]     0    
Ending balance [3],[12],[18],[34] 0   0    
Investment, Identifier [Axis]: Berry Aviation, Inc. | Preferred Member Units 3          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[33]     0    
Ending balance [3],[12],[18],[34] 0   0    
Investment, Identifier [Axis]: Bettercloud, Inc. | Common Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     (1,656)    
Amount of Unrealized Gain/(Loss)     354    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7],[17]     4,550    
Gross Additions     354    
Gross Reductions     4,904    
Ending balance $ 0   $ 0    
Investment, Identifier [Axis]: Bettercloud, Inc. | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [7],[17],[24]         12.07%
Spread 8.25%   8.25%   8.25% [7],[17],[22],[24]
PIK Rate [7],[14],[17],[24]         12.07%
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     90    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7],[17],[24]     1,747    
Gross Additions     670    
Gross Reductions     2,417    
Ending balance $ 0   0    
Investment, Identifier [Axis]: Bluestem Brands, Inc. | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10]     0    
Ending balance [3],[11],[12] $ 0   $ 0    
Investment, Identifier [Axis]: Bluestem Brands, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.23% [11],[12],[16],[21],[35]   12.23% [11],[12],[16],[21],[35]   12.49% [9],[10],[15],[24]
Spread 8.50% [11],[12],[16],[19],[21],[35]   8.50% [11],[12],[16],[19],[21],[35]   8.50% [9],[10],[15],[22],[24]
PIK Rate 11.23% [11],[12],[13],[16],[21],[35]   11.23% [11],[12],[13],[16],[21],[35]   11.49% [9],[10],[14],[15],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[15],[24]     $ 255    
Ending balance [3],[11],[12],[16],[21],[35] $ 269   $ 269    
Investment, Identifier [Axis]: Bluestem Brands, Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 14.25% [11],[12],[16],[21],[35]   14.25% [11],[12],[16],[21],[35]   14.25% [9],[10],[15],[24]
Spread 7.50% [11],[12],[16],[19],[21],[35]   7.50% [11],[12],[16],[19],[21],[35]   7.50% [9],[10],[15],[22],[24]
PIK Rate 13.25% [11],[12],[13],[16],[21],[35]   13.25% [11],[12],[13],[16],[21],[35]   13.25% [9],[10],[14],[15],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[15],[24]     $ 195    
Ending balance [3],[11],[12],[16],[21],[35] $ 90   $ 90    
Investment, Identifier [Axis]: Bluestem Brands, Inc. | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 12.23% [11],[12],[16],[21],[35]   12.23% [11],[12],[16],[21],[35]   12.49% [9],[10],[15],[24]
Spread 8.50% [11],[12],[16],[19],[21],[35]   8.50% [11],[12],[16],[19],[21],[35]   8.50% [9],[10],[15],[22],[24]
PIK Rate 11.23% [11],[12],[13],[16],[21],[35]   11.23% [11],[12],[13],[16],[21],[35]   11.49% [9],[10],[14],[15],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[15],[24]     $ 0    
Ending balance [3],[11],[12],[16],[21],[35] $ 0   0    
Investment, Identifier [Axis]: Bluestem Brands, Inc. | Warrants          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[31]     0    
Ending balance [3],[11],[12],[32] 0   0    
Investment, Identifier [Axis]: Boccella Precast Products LLC | Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[25]     700    
Ending balance [3],[12],[26] $ 660   $ 660    
Investment, Identifier [Axis]: Boccella Precast Products LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 10.00% [12]   10.00% [12]   10.00% [10]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 64    
Ending balance [3],[12] $ 64   64    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[36],[37]     0    
Ending balance [3],[12],[18],[38],[39] 0   0    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[36],[37]     350    
Ending balance [3],[12],[18],[38],[39] $ 390   $ 390    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.59% [12],[18],[21],[38],[39]   9.59% [12],[18],[21],[38],[39]   9.89% [10],[17],[24],[36],[37]
Spread 5.75% [12],[18],[19],[21],[38],[39]   5.75% [12],[18],[19],[21],[38],[39]   5.75% [10],[17],[22],[24],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 360    
Ending balance [3],[12],[18],[21],[38],[39] $ 180   $ 180    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.59% [12],[18],[21],[38],[39]   9.59% [12],[18],[21],[38],[39]   9.59% [10],[17],[24],[36],[37]
Spread 5.75% [12],[18],[19],[21],[38],[39]   5.75% [12],[18],[19],[21],[38],[39]   5.75% [10],[17],[22],[24],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 880    
Ending balance [3],[12],[18],[21],[38],[39] $ 876   $ 876    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 8.59% [12],[18],[21],[38],[39]   8.59% [12],[18],[21],[38],[39]   8.89% [10],[17],[24],[36],[37]
Spread 4.75% [12],[18],[19],[21],[38],[39]   4.75% [12],[18],[19],[21],[38],[39]   4.75% [10],[17],[22],[24],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 3,959    
Ending balance [3],[12],[18],[21],[38],[39] $ 3,939   $ 3,939    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 10.59% [12],[18],[21],[38],[39]   10.59% [12],[18],[21],[38],[39]   10.89% [10],[17],[24],[36],[37]
Spread 6.75% [12],[18],[19],[21],[38],[39]   6.75% [12],[18],[19],[21],[38],[39]   6.75% [10],[17],[22],[24],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 3,959    
Ending balance [3],[12],[18],[21],[38],[39] $ 3,939   3,939    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC | Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       (350)  
Amount of Interest, Fees or Dividends Credited to Income       15  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       1,170  
Gross Additions       0  
Gross Reductions       350  
Ending balance   $ 820   $ 820  
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC | Preferred Member Units 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     (100)    
Amount of Interest, Fees or Dividends Credited to Income     17    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7],[25]     860    
Gross Additions     0    
Gross Reductions     100    
Ending balance [3],[8],[26] $ 760   $ 760    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC | Preferred Member Units 2          
Schedule of Investments [Line Items]          
Total Rate 15.00% [8],[26]   15.00% [8],[26]   15.00% [7],[25]
PIK Rate 15.00% [8],[13],[26]   15.00% [8],[13],[26]   15.00% [7],[14],[25]
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     6    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7],[25]     84    
Gross Additions     6    
Gross Reductions     0    
Ending balance [3],[8],[26] $ 90   $ 90    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 13.72% [8],[21] 14.48% 13.72% [8],[21] 14.48% 13.98% [7],[24]
Spread 10.00% [8],[19],[21] 10.00% 10.00% [8],[19],[21] 10.00% 10.00% [7],[22],[24]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     87 91  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,254 [1],[7],[24] 1,254  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 1,254 [3],[8],[21] $ 1,254 1,254 [3],[8],[21] 1,254  
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 [1],[10],[36],[40],[41]     897    
Ending balance [3],[12],[38],[42],[43] 869   869    
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 [1],[10],[25],[36],[40],[41]     6,447    
Ending balance [3],[12],[26],[38],[42],[43] $ 5,968   $ 5,968    
Investment, Identifier [Axis]: Buca C, LLC | Preferred Member Units          
Schedule of Investments [Line Items]          
Total Rate 6.00% [12]   6.00% [12]   6.00% [10]
PIK Rate 6.00% [12],[13]   6.00% [12],[13]   6.00% [10],[14]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 0    
Ending balance [3],[12] $ 0   $ 0    
Investment, Identifier [Axis]: Buca C, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 15.00% [12],[16],[35]   15.00% [12],[16],[35]   15.00% [10],[15],[44]
PIK Rate 15.00% [12],[13],[16],[35]   15.00% [12],[13],[16],[35]   15.00% [10],[14],[15],[44]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[15],[44]     $ 0    
Ending balance [3],[12],[16],[35] $ 0   $ 0    
Investment, Identifier [Axis]: Buca C, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 15.00% [12],[16],[35]   15.00% [12],[16],[35]   15.00% [10],[15],[44]
PIK Rate 15.00% [12],[13],[16],[35]   15.00% [12],[13],[16],[35]   15.00% [10],[14],[15],[44]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[15],[44]     $ 0    
Ending balance [3],[12],[16],[35] $ 0   $ 0    
Investment, Identifier [Axis]: Buca C, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 15.00% [12],[16],[35]   15.00% [12],[16],[35]   15.00% [10],[15],[44]
PIK Rate 15.00% [12],[13],[16],[35]   15.00% [12],[13],[16],[35]   15.00% [10],[14],[15],[44]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[15],[44]     $ 0    
Ending balance [3],[12],[16],[35] $ 0   $ 0    
Investment, Identifier [Axis]: CQ Fluency, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 6.50% [12],[18],[19],[20],[21]   6.50% [12],[18],[19],[20],[21]   6.75% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (19)    
Ending balance [3],[12],[18],[20],[21] $ (13)   $ (13)    
Investment, Identifier [Axis]: CQ Fluency, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.33% [12],[18],[21]   10.33% [12],[18],[21]   10.52% [10],[17],[24]
Spread 6.50% [12],[18],[19],[21]   6.50% [12],[18],[19],[21]   6.75% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 6,844    
Ending balance [3],[12],[18],[21] $ 6,656   $ 6,656    
Investment, Identifier [Axis]: CRC Evans USA Bidco, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[24],[28],[36],[37]         10.87%
Spread 6.75% [12],[18],[19],[20],[21],[27],[38],[39]   6.75% [12],[18],[19],[20],[21],[27],[38],[39]   6.75% [10],[17],[22],[24],[28],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[28],[36],[37]     $ 448    
Ending balance [3],[12],[18],[20],[21],[27],[38],[39] $ 0   $ 0    
Investment, Identifier [Axis]: CRC Evans USA Bidco, Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Spread 6.75% [12],[18],[19],[20],[21],[38],[39]   6.75% [12],[18],[19],[20],[21],[38],[39]   6.75% [10],[17],[22],[23],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[36],[37]     $ (18)    
Ending balance [3],[12],[18],[20],[21],[38],[39] $ (16)   $ (16)    
Investment, Identifier [Axis]: CRC Evans USA Bidco, Inc. | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.74% [12],[18],[21],[38],[39]   10.74% [12],[18],[21],[38],[39]   10.70% [10],[17],[24],[36],[37]
Spread 6.75% [12],[18],[19],[21],[38],[39]   6.75% [12],[18],[19],[21],[38],[39]   6.75% [10],[17],[22],[24],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 613    
Ending balance [3],[12],[18],[21],[38],[39] $ 609   $ 609    
Investment, Identifier [Axis]: CRC Evans USA Bidco, Inc. | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 10.71% [12],[18],[21],[38],[39]   10.71% [12],[18],[21],[38],[39]   10.83% [10],[17],[24],[36],[37]
Spread 6.75% [12],[18],[19],[21],[38],[39]   6.75% [12],[18],[19],[21],[38],[39]   6.75% [10],[17],[22],[24],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 979    
Ending balance [3],[12],[18],[21],[38],[39] $ 954   954    
Investment, Identifier [Axis]: Career Team Holdings, LLC | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     600    
Ending balance [3],[12] $ 600   $ 600    
Investment, Identifier [Axis]: Career Team Holdings, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 6.00% [12],[19],[20],[21]   6.00% [12],[19],[20],[21]   6.00% [10],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[23],[24]     $ (6)    
Ending balance [3],[12],[20],[21] $ (6)   $ (6)    
Investment, Identifier [Axis]: Career Team Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.00% [12]   13.00% [12]   13.00% [10]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 2,379    
Ending balance [3],[12] $ 2,385   2,385    
Investment, Identifier [Axis]: CaseWorthy, Inc. | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     230    
Investment, Identifier [Axis]: CenterPeak Holdings, LLC | Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[25]     2,700    
Ending balance [3],[12],[26] 3,140   3,140    
Investment, Identifier [Axis]: CenterPeak Holdings, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10]         15.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     200    
Investment, Identifier [Axis]: CenterPeak Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10]         15.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     2,790    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC | Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     11,595 0  
Amount of Unrealized Gain/(Loss)     (9,084) 1,030  
Amount of Interest, Fees or Dividends Credited to Income     610 15  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     10,680 [1],[7] 3,110  
Gross Additions     10,595 1,030  
Gross Reductions     21,275 0  
Ending balance $ 0 $ 4,140 $ 0 $ 4,140  
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 8.00% 10.00% 8.00% 10.00% 8.00% [7],[22],[23],[24]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     2 2  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7],[23],[24] 0  
Gross Additions     60 0  
Gross Reductions     60 0  
Ending balance $ 0 $ 0 $ 0 $ 0  
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate   14.48%   14.48% 11.98% [7],[24]
Spread 8.00% 10.00% 8.00% 10.00% 8.00% [7],[22],[24]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (18) (6)  
Amount of Interest, Fees or Dividends Credited to Income     359 451  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     6,021 [1],[7],[24] 6,384  
Gross Additions     1,718 6  
Gross Reductions     7,739 274  
Ending balance $ 0 $ 6,116 0 6,116  
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)     2,480 (210)  
Amount of Interest, Fees or Dividends Credited to Income     773 1,189  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     8,880 [1],[7],[25] 8,280  
Gross Additions     2,480 0  
Gross Reductions     0 210  
Ending balance 11,360 [3],[8],[26] 8,070 11,360 [3],[8],[26] 8,070  
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)     40 35  
Amount of Interest, Fees or Dividends Credited to Income     12 12  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,043 [1],[7],[25],[33] 888  
Gross Additions     40 35  
Gross Reductions     0 0  
Ending balance $ 1,083 [3],[8],[26],[34] $ 923 $ 1,083 [3],[8],[26],[34] $ 923  
Investment, Identifier [Axis]: Chamberlin Holding LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 6.00% [8],[19],[20],[21] 6.00% 6.00% [8],[19],[20],[21] 6.00% 6.00% [7],[22],[23],[24]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (3) (11)  
Amount of Interest, Fees or Dividends Credited to Income     6 12  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7],[23],[24] 0  
Gross Additions     3 11  
Gross Reductions     3 11  
Ending balance $ 0 [3],[8],[20],[21] $ 0 $ 0 [3],[8],[20],[21] $ 0  
Investment, Identifier [Axis]: Chamberlin Holding LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.74% [8],[21] 12.49% 11.74% [8],[21] 12.49% 11.99% [7],[24]
Spread 8.00% [8],[19],[21] 8.00% 8.00% [8],[19],[21] 8.00% 8.00% [7],[22],[24]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (26) 3  
Amount of Interest, Fees or Dividends Credited to Income     645 264  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     10,505 [1],[7],[24] 3,905  
Gross Additions     26 800  
Gross Reductions     226 0  
Ending balance $ 10,305 [3],[8],[21] $ 4,705 $ 10,305 [3],[8],[21] 4,705  
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.66% [12],[18],[21],[27]   10.66% [12],[18],[21],[27]   10.84% [10],[17],[24],[28]
Spread 6.75% [12],[18],[19],[21],[27]   6.75% [12],[18],[19],[21],[27]   6.75% [10],[17],[22],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[28]     $ 667    
Ending balance [3],[12],[18],[21],[27] $ 676   $ 676    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.64% [12],[18],[21]   10.64% [12],[18],[21]   10.84% [10],[17],[24]
Spread 6.75% [12],[18],[19],[21]   6.75% [12],[18],[19],[21]   6.75% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 3,291    
Ending balance [3],[12],[18],[21] $ 3,274   $ 3,274    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.64% [12],[18],[21]   10.64% [12],[18],[21]   10.84% [10],[17],[24]
Spread 6.75% [12],[18],[19],[21]   6.75% [12],[18],[19],[21]   6.75% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 182    
Ending balance [3],[12],[18],[21] $ 181   $ 181    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 10.64% [12],[18],[21]   10.64% [12],[18],[21]   10.84% [10],[17],[24]
Spread 6.75% [12],[18],[19],[21]   6.75% [12],[18],[19],[21]   6.75% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 441    
Ending balance [3],[12],[18],[21] $ 438   $ 438    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC | Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21] 10.65%   10.65%    
Spread [12],[18],[19],[21] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[21] $ 359   $ 359    
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)     (220) (60)  
Amount of Interest, Fees or Dividends Credited to Income     123 134  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,010 [1],[7],[25] 3,900  
Gross Additions     0 0  
Gross Reductions     220 60  
Ending balance 3,790 [3],[8],[26] 3,840 3,790 [3],[8],[26] 3,840  
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)     190 320  
Amount of Interest, Fees or Dividends Credited to Income     174 203  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,530 [1],[7],[25] 2,750  
Gross Additions     190 320  
Gross Reductions     0 0  
Ending balance 3,720 [3],[8],[26] 3,070 3,720 [3],[8],[26] 3,070  
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)     60 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     317 [1],[7],[33] 237  
Gross Additions     60 80  
Gross Reductions     0 0  
Ending balance 377 [3],[8],[34] 317 377 [3],[8],[34] 317  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     3 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7],[23] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 [3],[8],[20] $ 0 $ 0 [3],[8],[20] $ 0  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.00% [8] 9.00% 10.00% [8] 9.00% 10.00% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (4) (1)  
Amount of Interest, Fees or Dividends Credited to Income     119 78  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,370 [1],[7] 1,690  
Gross Additions     4 1  
Gross Reductions     148 121  
Ending balance $ 2,226 [3],[8] $ 1,570 $ 2,226 [3],[8] $ 1,570  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.00% [8] 10.00% 10.00% [8] 10.00% 10.00% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     12 12  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     232 [1],[7] 243  
Gross Additions     0 0  
Gross Reductions     5 5  
Ending balance $ 227 [3],[8] $ 238 227 [3],[8] 238  
Investment, Identifier [Axis]: Clarius BIGS, LLC | Secured Debt          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[15],[17],[44]     8    
Ending balance [3],[12],[16],[18],[35],[45] 4   4    
Investment, Identifier [Axis]: Classic H&G Holdings, LLC | Preferred Member Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     510    
Ending balance [3],[12] 510   510    
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) (160)  
Amount of Interest, Fees or Dividends Credited to Income     197 336  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     16,270 [1],[7],[25],[33] 16,950  
Gross Additions     0 0  
Gross Reductions     420 160  
Ending balance $ 15,850 [3],[8],[26],[34] $ 16,790 $ 15,850 [3],[8],[26],[34] $ 16,790  
Investment, Identifier [Axis]: Cody Pools, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.50% [8] 12.50% 12.50% [8] 12.50%  
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     1 3  
Amount of Interest, Fees or Dividends Credited to Income     8 19  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7],[23] 0  
Gross Additions     629 782  
Gross Reductions     393 79  
Ending balance $ 236 [3],[8] $ 703 $ 236 [3],[8] $ 703  
Investment, Identifier [Axis]: Cody Pools, Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.50% [8] 12.50% 12.50% [8] 12.50% 12.50% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (14) (4)  
Amount of Interest, Fees or Dividends Credited to Income     374 401  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     5,891 [1],[7] 6,598  
Gross Additions     14 4  
Gross Reductions     231 389  
Ending balance $ 5,674 [3],[8] $ 6,213 5,674 [3],[8] 6,213  
Investment, Identifier [Axis]: Colonial Electric Company LLC | Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     1,320 430  
Amount of Interest, Fees or Dividends Credited to Income     507 467  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,210 [1],[7],[25] 3,390  
Gross Additions     1,320 430  
Gross Reductions     0 0  
Ending balance 5,530 [3],[8],[26] 3,820 5,530 [3],[8],[26] 3,820  
Investment, Identifier [Axis]: Colonial Electric Company LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     1 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7],[23] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 [3],[8],[20] $ 0 $ 0 [3],[8],[20] $ 0  
Investment, Identifier [Axis]: Colonial Electric Company LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.00% [8] 12.00% 9.00% [8] 12.00% 9.00% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     19 (12)  
Amount of Interest, Fees or Dividends Credited to Income     105 215  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,195 [1],[7] 3,578  
Gross Additions     0 12  
Gross Reductions     0 716  
Ending balance $ 2,195 [3],[8] $ 2,874 2,195 [3],[8] 2,874  
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)     63 3  
Amount of Interest, Fees or Dividends Credited to Income     30 30  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,800 [1],[7] 1,860  
Gross Additions     161 3  
Gross Reductions     0 0  
Ending balance 1,961 [3],[8] 1,863 1,961 [3],[8] 1,863  
Investment, Identifier [Axis]: Compass Systems & Sales, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     2 2  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     (12) [1],[7],[23] (16)  
Gross Additions     2 2  
Gross Reductions     0 0  
Ending balance $ (10) [3],[8],[20] $ (14) $ (10) [3],[8],[20] $ (14)  
Investment, Identifier [Axis]: Compass Systems & Sales, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.50% [8] 13.50% 13.50% [8] 13.50% 13.50% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (23) 23  
Amount of Interest, Fees or Dividends Credited to Income     302 305  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,249 [1],[7] 4,201  
Gross Additions     21 35  
Gross Reductions     573 0  
Ending balance $ 3,697 [3],[8] $ 4,236 $ 3,697 [3],[8] 4,236  
Investment, Identifier [Axis]: Computer Data Source, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 15.00% [12],[18]   15.00% [12],[18]   12.28% [10],[17],[24],[28]
Spread [10],[17],[22],[24],[28]         8.25%
PIK Rate 15.00% [12],[13],[18]   15.00% [12],[13],[18]   12.02% [10],[14],[17],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[28]     $ 6,996    
Ending balance [3],[12],[18] $ 646   $ 646    
Investment, Identifier [Axis]: Computer Data Source, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 14.05% [12],[16],[18],[21],[27]   14.05% [12],[16],[18],[21],[27]   12.02% [10],[17],[24]
Spread 10.25% [12],[16],[18],[19],[21],[27]   10.25% [12],[16],[18],[19],[21],[27]   8.25% [10],[17],[22],[24]
PIK Rate 14.05% [12],[13],[16],[18],[21],[27]   14.05% [12],[13],[16],[18],[21],[27]   12.02% [10],[14],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 16,960    
Ending balance [3],[12],[16],[18],[21],[27] $ 4,927   $ 4,927    
Investment, Identifier [Axis]: Computer Data Source, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[16],[18],[21] 14.05%   14.05%    
Spread [12],[16],[18],[19],[21] 10.25%   10.25%    
PIK Rate [12],[13],[16],[18],[21] 14.05%   14.05%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[16],[18],[21] $ 11,998   $ 11,998    
Investment, Identifier [Axis]: Connect Telecommunications Solutions Holdings, Inc. | Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[36],[37]     1,400    
Ending balance [3],[12],[38],[39] $ 1,400   $ 1,400    
Investment, Identifier [Axis]: Connect Telecommunications Solutions Holdings, Inc. | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 13.00% [12],[38],[39]   13.00% [12],[38],[39]   13.00% [10],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[36],[37]     $ 2,642    
Ending balance [3],[12],[38],[39] $ 2,513   2,513    
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)     65 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     390 [1],[5],[36],[40],[41] 530  
Gross Additions     65 0  
Gross Reductions     75 16  
Ending balance 380 [3],[6],[38],[42],[43] 514 380 [3],[6],[38],[42],[43] 514  
Investment, Identifier [Axis]: Core Transformers | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     1,000    
Ending balance [3],[12],[18] $ 5,820   $ 5,820    
Investment, Identifier [Axis]: Core Transformers | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.00% [12],[18],[19],[20],[21]   5.00% [12],[18],[19],[20],[21]   5.50% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (95)    
Ending balance [3],[12],[18],[20],[21] $ (86)   $ (86)    
Investment, Identifier [Axis]: Core Transformers | Secured Debt 2          
Schedule of Investments [Line Items]          
Spread 5.00% [12],[18],[19],[20],[21]   5.00% [12],[18],[19],[20],[21]   5.50% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (95)    
Ending balance [3],[12],[18],[20],[21] $ (86)   $ (86)    
Investment, Identifier [Axis]: Core Transformers | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 8.66% [12],[18],[21]   8.66% [12],[18],[21]   9.23% [10],[17],[24]
Spread 5.00% [12],[18],[19],[21]   5.00% [12],[18],[19],[21]   5.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 9,811    
Ending balance [3],[12],[18],[21] $ 10,000   $ 10,000    
Investment, Identifier [Axis]: CoreStack, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[18] 10.00%   10.00%    
PIK Rate [12],[13],[18] 10.00%   10.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18] $ 410   $ 410    
Investment, Identifier [Axis]: CoreStack, Inc. | Secured Debt 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[45] $ 3,800   $ 3,800    
Investment, Identifier [Axis]: Coregistics Buyer LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.16% [12],[18],[21],[27],[38],[39]   10.16% [12],[18],[21],[27],[38],[39]   10.32% [10],[17],[24],[28],[36],[37]
Spread 6.50% [12],[18],[19],[21],[27],[38],[39]   6.50% [12],[18],[19],[21],[27],[38],[39]   6.50% [10],[17],[22],[24],[28],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[28],[36],[37]     $ 445    
Ending balance [3],[12],[18],[21],[27],[38],[39] $ 445   $ 445    
Investment, Identifier [Axis]: Coregistics Buyer LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.16% [12],[18],[21],[38],[39]   10.16% [12],[18],[21],[38],[39]   10.34% [10],[17],[24],[36],[37]
Spread 6.50% [12],[18],[19],[21],[38],[39]   6.50% [12],[18],[19],[21],[38],[39]   6.50% [10],[17],[22],[24],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 2,818    
Ending balance [3],[12],[18],[21],[38],[39] $ 2,798   $ 2,798    
Investment, Identifier [Axis]: Coregistics Buyer LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.41% [12],[18],[21],[38],[39]   10.41% [12],[18],[21],[38],[39]   10.59% [10],[17],[24],[36],[37]
Spread 6.75% [12],[18],[19],[21],[38],[39]   6.75% [12],[18],[19],[21],[38],[39]   6.75% [10],[17],[22],[24],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 8,516    
Ending balance [3],[12],[18],[21],[38],[39] $ 8,169   $ 8,169    
Investment, Identifier [Axis]: Coregistics Buyer LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 10.15% [12],[18],[21],[38],[39]   10.15% [12],[18],[21],[38],[39]   10.37% [10],[17],[24],[36],[37]
Spread 6.50% [12],[18],[19],[21],[38],[39]   6.50% [12],[18],[19],[21],[38],[39]   6.50% [10],[17],[22],[24],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 1,879    
Ending balance [3],[12],[18],[21],[38],[39] $ 1,865   1,865    
Investment, Identifier [Axis]: Creative Foam Corporation | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     230    
Ending balance [3],[12],[18] $ 160   $ 160    
Investment, Identifier [Axis]: Creative Foam Corporation | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 7.00% [12],[18],[19],[20],[21]   7.00% [12],[18],[19],[20],[21]   6.75% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (22)    
Ending balance [3],[12],[18],[20],[21] $ (18)   $ (18)    
Investment, Identifier [Axis]: Creative Foam Corporation | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.67% [12],[18],[21]   10.67% [12],[18],[21]   10.69% [10],[17],[24]
Spread 7.00% [12],[18],[19],[21]   7.00% [12],[18],[19],[21]   6.75% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 16,578    
Ending balance [3],[12],[18],[21] $ 16,568   $ 16,568    
Investment, Identifier [Axis]: Creative Foam Corporation | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.73% [12],[18],[21]   10.73% [12],[18],[21]   10.44% [10],[17],[24]
Spread 7.00% [12],[18],[19],[21]   7.00% [12],[18],[19],[21]   6.75% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 10,400    
Ending balance [3],[12],[18],[21] $ 10,391   10,391    
Investment, Identifier [Axis]: DMA Industries, LLC | Preferred Equity 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     1,670 90  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,296 [1],[7] 1,486  
Gross Additions     1,670 90  
Gross Reductions     0 0  
Ending balance $ 3,966 [3],[8] $ 1,576 $ 3,966 [3],[8] $ 1,576  
Investment, Identifier [Axis]: DMA Industries, LLC | Preferred Equity 2          
Schedule of Investments [Line Items]          
Total Rate 15.00% [8],[26] 15.00% 15.00% [8],[26] 15.00% 15.00% [7],[25]
PIK Rate 15.00% [8],[13],[26] 15.00% 15.00% [8],[13],[26] 15.00% 15.00% [7],[14],[25]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     861 50  
Amount of Interest, Fees or Dividends Credited to Income     73 61  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,358 [1],[7],[25] 810  
Gross Additions     932 111  
Gross Reductions     0 0  
Ending balance $ 2,290 [3],[8],[26] $ 921 $ 2,290 [3],[8],[26] $ 921  
Investment, Identifier [Axis]: DMA Industries, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 13.00% [8] 12.00% 13.00% [8] 12.00% 10.00% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     19 0  
Amount of Interest, Fees or Dividends Credited to Income     39 9  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     140 [1],[7] 138  
Gross Additions     1,020 0  
Gross Reductions     0 0  
Ending balance $ 1,160 [3],[8] $ 138 $ 1,160 [3],[8] $ 138  
Investment, Identifier [Axis]: DMA Industries, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.00% [8] 12.00% 13.00% [8] 12.00% 10.00% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (3) 0  
Amount of Interest, Fees or Dividends Credited to Income     188 258  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,200 [1],[7] 4,161  
Gross Additions     3 5  
Gross Reductions     3 0  
Ending balance $ 3,200 [3],[8] $ 4,166 3,200 [3],[8] 4,166  
Investment, Identifier [Axis]: DTE Enterprises, LLC | Class A Preferred Member Units          
Schedule of Investments [Line Items]          
Total Rate [10],[17]         8.00%
PIK Rate [10],[14],[17]         8.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     0    
Investment, Identifier [Axis]: DTE Enterprises, LLC | Class AA Preferred Member Units (non-voting)          
Schedule of Investments [Line Items]          
Total Rate [10],[17]         10.00%
PIK Rate [10],[14],[17]         10.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     0    
Investment, Identifier [Axis]: Dalton US Inc. | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     50    
Ending balance [3],[12],[18] 50   50    
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 (70)  
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 [1],[7] 30  
Gross Additions     0 40  
Gross Reductions     0 70  
Ending balance $ 0 [3],[8] $ 0 $ 0 [3],[8] $ 0  
Investment, Identifier [Axis]: Datacom, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.00% [8] 7.50% 10.00% [8] 7.50% 7.50% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     3 4  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     75 [1],[7] 55  
Gross Additions     45 79  
Gross Reductions     15 60  
Ending balance $ 105 [3],[8] $ 74 $ 105 [3],[8] $ 74  
Investment, Identifier [Axis]: Datacom, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.00% [8] 10.00% 10.00% [8] 10.00% 10.00% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (207) (74)  
Amount of Interest, Fees or Dividends Credited to Income     44 55  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     463 [1],[7] 878  
Gross Additions     0 10  
Gross Reductions     216 89  
Ending balance $ 247 [3],[8] $ 799 247 [3],[8] 799  
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     25 25  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,459 [1],[7],[25] 2,459  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 2,459 [3],[8],[26] $ 2,459 $ 2,459 [3],[8],[26] $ 2,459  
Investment, Identifier [Axis]: Digital Products Holdings LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 13.62% [8],[21] 14.38% 13.62% [8],[21] 14.38% 13.88% [7],[24]
Spread 10.00% [8],[19],[21] 10.00% 10.00% [8],[19],[21] 10.00% 10.00% [7],[22],[24]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     151 0  
Amount of Interest, Fees or Dividends Credited to Income     207 225  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,834 [1],[7],[24] 3,105  
Gross Additions     141 5  
Gross Reductions     83 165  
Ending balance $ 2,892 [3],[8],[21] $ 2,945 2,892 [3],[8],[21] 2,945  
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)     1,881 140  
Amount of Interest, Fees or Dividends Credited to Income     2 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,940 [1],[7] 4,480  
Gross Additions     3,081 140  
Gross Reductions     40 0  
Ending balance 7,981 [3],[8] 4,620 7,981 [3],[8] 4,620  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [7]         14.00%
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       (1)  
Amount of Interest, Fees or Dividends Credited to Income       2  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     315 [1],[7] 0  
Gross Additions       1  
Gross Reductions       1  
Ending balance 0 [3],[8],[20] $ 0 0 [3],[8],[20] $ 0  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc. | Secured Debt 1.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     17    
Amount of Interest, Fees or Dividends Credited to Income     12    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     315    
Gross Additions     285    
Gross Reductions     600    
Ending balance $ 0   $ 0    
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 14.00% [8] 14.00% 14.00% [8] 14.00% 14.00% [7]
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       (6)  
Amount of Interest, Fees or Dividends Credited to Income       328  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 4,501 [1],[7] 4,668  
Gross Additions       6  
Gross Reductions       173  
Ending balance $ 8,726 [3],[8] $ 4,501 $ 8,726 [3],[8] 4,501  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc. | Secured Debt 2.1          
Schedule of Investments [Line Items]          
Total Rate 14.00%   14.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     (1)    
Amount of Interest, Fees or Dividends Credited to Income     55    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,501    
Gross Additions     0    
Gross Reductions     4,501    
Ending balance $ 0   $ 0    
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc. | Secured Debt 3.1          
Schedule of Investments [Line Items]          
Total Rate 14.00%   14.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     204    
Amount of Interest, Fees or Dividends Credited to Income     514    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     8,726    
Gross Reductions     0    
Ending balance $ 8,726   8,726    
Investment, Identifier [Axis]: Dynamic Communities, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     0    
Ending balance [3],[12],[18] 0   0    
Investment, Identifier [Axis]: Dynamic Communities, LLC | Preferred Equity 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     110    
Ending balance [3],[12],[18] 110   110    
Investment, Identifier [Axis]: Dynamic Communities, LLC | Preferred Equity 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     0    
Ending balance [3],[12],[18] $ 0   $ 0    
Investment, Identifier [Axis]: Dynamic Communities, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.74% [12],[18],[21]   11.74% [12],[18],[21]   11.82% [10],[17],[24]
Spread 8.00% [12],[18],[19],[21]   8.00% [12],[18],[19],[21]   8.00% [10],[17],[22],[24]
PIK Rate 11.74% [12],[13],[18],[21]   11.74% [12],[13],[18],[21]   11.82% [10],[14],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 2,612    
Ending balance [3],[12],[18],[21] $ 2,769   $ 2,769    
Investment, Identifier [Axis]: Dynamic Communities, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.74% [12],[18],[21]   12.74% [12],[18],[21]   12.82% [10],[17],[24]
Spread 9.00% [12],[18],[19],[21]   9.00% [12],[18],[19],[21]   9.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 2,464    
Ending balance [3],[12],[18],[21] $ 2,463   2,463    
Investment, Identifier [Axis]: Electro Technical Industries, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     1,080    
Ending balance [3],[12],[18] $ 1,930   $ 1,930    
Investment, Identifier [Axis]: Electro Technical Industries, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.50% [12],[18],[19],[20],[21]   5.50% [12],[18],[19],[20],[21]   5.50% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (73)    
Ending balance [3],[12],[18],[20],[21] $ (64)   $ (64)    
Investment, Identifier [Axis]: Electro Technical Industries, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.14% [12],[18],[21]   9.14% [12],[18],[21]   9.22% [10],[17],[24]
Spread 5.50% [12],[18],[19],[21]   5.50% [12],[18],[19],[21]   5.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 24,466    
Ending balance [3],[12],[18],[21] $ 24,155   24,155    
Investment, Identifier [Axis]: Elgin AcquireCo, LLC | Common Stock 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     330    
Ending balance [3],[12] 270   270    
Investment, Identifier [Axis]: Elgin AcquireCo, LLC | Common Stock 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[33]     214    
Ending balance [3],[12],[34] $ 222   $ 222    
Investment, Identifier [Axis]: Elgin AcquireCo, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 6.00% [12],[19],[20],[21]   6.00% [12],[19],[20],[21]   6.00% [10],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[23],[24]     $ 0    
Ending balance [3],[12],[20],[21] $ 0   $ 0    
Investment, Identifier [Axis]: Elgin AcquireCo, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.00% [12]   12.00% [12]   12.00% [10]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 1,085    
Ending balance [3],[12] $ 1,081   $ 1,081    
Investment, Identifier [Axis]: Elgin AcquireCo, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.00% [12]   9.00% [12]   9.00% [10]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 402    
Ending balance [3],[12] $ 401   $ 401    
Investment, Identifier [Axis]: Emerald Technologies Acquisition Co, Inc. | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 10.13% [11],[12],[21]   10.13% [11],[12],[21]   10.22% [9],[10],[24]
Spread 6.25% [11],[12],[19],[21]   6.25% [11],[12],[19],[21]   6.25% [9],[10],[22],[24]
PIK Rate [11],[12],[13],[21] 5.25%   5.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[24]     $ 1,427    
Ending balance [3],[11],[12],[21] $ 1,810   1,810    
Investment, Identifier [Axis]: Escalent, Inc. | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     240    
Ending balance [3],[12],[18] $ 240   $ 240    
Investment, Identifier [Axis]: Escalent, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21] 9.73%   9.73%    
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   6.00% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ 0    
Ending balance [3],[12],[18],[21] $ 112   $ 112    
Investment, Identifier [Axis]: Escalent, Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.73% [12],[18],[21]   9.73% [12],[18],[21]   9.67% [10],[17],[24]
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   6.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 356    
Ending balance [3],[12],[18],[21] $ 351   $ 351    
Investment, Identifier [Axis]: Escalent, Inc. | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.73% [12],[18],[21]   9.73% [12],[18],[21]   9.67% [10],[17],[24]
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   6.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 6,715    
Ending balance [3],[12],[18],[21] $ 6,610   $ 6,610    
Investment, Identifier [Axis]: Event Holdco, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.99% [12],[18],[21]   10.99% [12],[18],[21]   10.93% [10],[17],[24]
Spread 7.00% [12],[18],[19],[21]   7.00% [12],[18],[19],[21]   7.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 308    
Ending balance [3],[12],[18],[21] $ 308   $ 308    
Investment, Identifier [Axis]: Event Holdco, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.99% [12],[18],[21]   10.99% [12],[18],[21]   10.93% [10],[17],[24]
Spread 7.00% [12],[18],[19],[21]   7.00% [12],[18],[19],[21]   7.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 4,003    
Ending balance [3],[12],[18],[21] $ 3,980   3,980    
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC | Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[23]     0    
Ending balance [3],[12],[20] $ 0   $ 0    
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.00% [12]   13.00% [12]   13.00% [10]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 7,790    
Ending balance [3],[12] $ 7,585   7,585    
Investment, Identifier [Axis]: FCC Intermediate Holdco, LLC | Warrants          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[25],[31]     3,780    
Ending balance [3],[12],[26],[32] $ 3,400   $ 3,400    
Investment, Identifier [Axis]: Fidelity Government Portfolio Fund Class III          
Schedule of Investments [Line Items]          
Total Rate         3.42%
Spread 3.28%   3.28%    
Investment, Identifier [Axis]: First American Treasury Obligations Fund Class Z          
Schedule of Investments [Line Items]          
Total Rate 3.53%   3.53%   3.67%
Investment, Identifier [Axis]: Flame King Holdings, 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     13    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     982    
Gross Reductions     0    
Ending balance [3],[8],[26],[34],[46] $ 982   982    
Investment, Identifier [Axis]: Flame King Holdings, LLC | Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     820    
Amount of Interest, Fees or Dividends Credited to Income     630    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7],[25]     13,660    
Gross Additions     820    
Gross Reductions     0    
Ending balance [3],[8],[26] $ 14,480   $ 14,480    
Investment, Identifier [Axis]: Flame King Holdings, LLC | Preferred Equity 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       1,360  
Amount of Interest, Fees or Dividends Credited to Income       1,738  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       8,980  
Gross Additions       1,360  
Gross Reductions       0  
Ending balance   $ 10,340   $ 10,340  
Investment, Identifier [Axis]: Flame King Holdings, LLC | Preferred Equity 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       5  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       0  
Gross Additions       16,175  
Gross Reductions       0  
Ending balance   $ 16,175   16,175  
Investment, Identifier [Axis]: Flame King Holdings, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [8] 12.00%   12.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     (32)    
Amount of Interest, Fees or Dividends Credited to Income     1,030    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     16,500    
Gross Additions     32    
Gross Reductions     32    
Ending balance [3],[8] $ 16,500   16,500    
Investment, Identifier [Axis]: Flame King Holdings, LLC | Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7],[23]     0    
Investment, Identifier [Axis]: Flame King Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [7]         12.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7]     16,500    
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 (82)  
Amount of Interest, Fees or Dividends Credited to Income     0 (23)  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     193 [1],[7],[36],[40],[41] 1,263  
Gross Additions     0 0  
Gross Reductions     85 1,070  
Ending balance 108 [3],[8],[38],[42],[43] 193 108 [3],[8],[38],[42],[43] 193  
Investment, Identifier [Axis]: GFG Group, LLC | Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 (110)  
Amount of Interest, Fees or Dividends Credited to Income     76 145  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,740 [1],[7],[25] 2,640  
Gross Additions     0 0  
Gross Reductions     0 110  
Ending balance $ 2,740 [3],[8],[26] 2,530 $ 2,740 [3],[8],[26] 2,530  
Investment, Identifier [Axis]: GFG Group, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 13.50% [8]   13.50% [8]   8.00% [7]
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     22    
Amount of Interest, Fees or Dividends Credited to Income     193    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7]     3,513    
Gross Additions     31    
Gross Reductions     1    
Ending balance [3],[8] $ 3,543   3,543    
Investment, Identifier [Axis]: GFG Group, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       (16)  
Amount of Interest, Fees or Dividends Credited to Income       57  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       2,046  
Gross Additions       2  
Gross Reductions       2,048  
Ending balance   $ 0   $ 0  
Investment, Identifier [Axis]: GFG Group, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate   8.00%   8.00%  
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       0  
Gross Additions       2,313  
Gross Reductions       0  
Ending balance   $ 2,313   2,313  
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)     (1,700) 460  
Amount of Interest, Fees or Dividends Credited to Income     809 1,541  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     22,830 [1],[5],[25] 22,600  
Gross Additions     0 460  
Gross Reductions     1,700 0  
Ending balance $ 21,130 [3],[6],[26] $ 23,060 $ 21,130 [3],[6],[26] $ 23,060  
Investment, Identifier [Axis]: GRT Rubber Technologies LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.72% [6] 10.48% 9.72% [6] 10.48% 9.98% [5]
Spread 6.00% [6],[19] 6.00% 6.00% [6],[19] 6.00% 6.00% [5],[22]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (3) (3)  
Amount of Interest, Fees or Dividends Credited to Income     79 85  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,550 [1],[5] 1,550  
Gross Additions     3 3  
Gross Reductions     3 3  
Ending balance $ 1,550 [3],[6] $ 1,550 $ 1,550 [3],[6] $ 1,550  
Investment, Identifier [Axis]: GRT Rubber Technologies LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.72% [6] 12.48% 11.72% [6] 12.48% 11.98% [5]
Spread 8.00% [6],[19] 8.00% 8.00% [6],[19] 8.00% 8.00% [5],[22]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (24) (25)  
Amount of Interest, Fees or Dividends Credited to Income     1,206 1,275  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     19,944 [1],[5] 19,944  
Gross Additions     25 25  
Gross Reductions     25 25  
Ending balance $ 19,944 [3],[6] $ 19,944 19,944 [3],[6] 19,944  
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7],[33]     99    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       810  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     28,450 [1],[7],[25] 28,690  
Gross Additions       0  
Gross Reductions       0  
Ending balance   $ 28,690   $ 28,690  
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Member Units 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     2,660    
Amount of Interest, Fees or Dividends Credited to Income     630    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     28,450    
Gross Additions     2,660    
Gross Reductions     0    
Ending balance [3],[8],[26] 31,110   31,110    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Member Units 2          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     99    
Gross Additions     0    
Gross Reductions     23    
Ending balance [3],[8],[34] $ 76   $ 76    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [8],[21],[47] 11.12%   11.12%    
Spread 7.50% [8],[19],[21],[47] 7.50% 7.50% [8],[19],[21],[47] 7.50% 7.50% [7],[22],[23],[24],[48]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     16 1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7],[23],[24],[48] 0  
Gross Additions     400 0  
Gross Reductions     0 0  
Ending balance $ 400 [3],[8],[21],[47] $ 0 $ 400 [3],[8],[21],[47] $ 0  
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.12% [8],[21] 11.50% 11.12% [8],[21] 11.50% 11.38% [7],[24]
Spread 7.50% [8],[19],[21] 7.50% 7.50% [8],[19],[21] 7.50% 7.50% [7],[22],[24]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (2) (19)  
Amount of Interest, Fees or Dividends Credited to Income     1,078 1,074  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     17,632 [1],[7],[24] 18,282  
Gross Additions     1,112 19  
Gross Reductions     2 219  
Ending balance $ 18,742 [3],[8],[21] $ 18,082 18,742 [3],[8],[21] 18,082  
Investment, Identifier [Axis]: Garyline, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     130    
Ending balance [3],[12],[18] $ 130   $ 130    
Investment, Identifier [Axis]: Garyline, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21] 10.89%   10.89%    
Spread 7.25% [12],[18],[19],[21]   7.25% [12],[18],[19],[21]   7.25% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ 0    
Ending balance [3],[12],[18],[21] $ 611   $ 611    
Investment, Identifier [Axis]: Garyline, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.90% [12],[18],[21]   10.90% [12],[18],[21]   10.98% [10],[17],[24]
Spread 7.25% [12],[18],[19],[21]   7.25% [12],[18],[19],[21]   7.25% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 8,514    
Ending balance [3],[12],[18],[21] $ 8,405   8,405    
Investment, Identifier [Axis]: GradeEight Corp. | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     423    
Ending balance [3],[12],[18] $ 370   $ 370    
Investment, Identifier [Axis]: GradeEight Corp. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.15% [12],[18],[21]   11.15% [12],[18],[21]   11.23% [10],[17],[24]
Spread 7.50% [12],[18],[19],[21]   7.50% [12],[18],[19],[21]   7.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 391    
Ending balance [3],[12],[18],[21] $ 70   $ 70    
Investment, Identifier [Axis]: GradeEight Corp. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.37% [12],[18],[21]   11.37% [12],[18],[21]   11.23% [10],[17],[24]
Spread 7.50% [12],[18],[19],[21]   7.50% [12],[18],[19],[21]   7.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 1,922    
Ending balance [3],[12],[18],[21] $ 1,938   $ 1,938    
Investment, Identifier [Axis]: GradeEight Corp. | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 11.13% [12],[18],[21],[49]   11.13% [12],[18],[21],[49]   11.31% [10],[17],[24],[50]
Spread 7.50% [12],[18],[19],[21],[49]   7.50% [12],[18],[19],[21],[49]   7.25% [10],[17],[22],[24],[50]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[50]     $ 14,136    
Ending balance [3],[12],[18],[21],[49] $ 14,205   14,205    
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC | Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       0  
Gross Additions       0  
Gross Reductions       0  
Ending balance   0   0  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC | Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       0  
Gross Additions       0  
Gross Reductions       0  
Ending balance   $ 0   $ 0  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread   9.50%   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   $ 0  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate   12.50%   12.50%  
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       123  
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       91  
Gross Reductions       0  
Ending balance   $ 469   469  
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     0    
Ending balance [3],[12],[18] $ 0   $ 0    
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.01% [12],[16],[18],[21]   9.01% [12],[16],[18],[21]   9.01% [10],[15],[17],[24]
Spread 3.50% [12],[16],[18],[19],[21]   3.50% [12],[16],[18],[19],[21]   3.50% [10],[15],[17],[22],[24]
PIK Rate 2.50% [12],[13],[16],[18],[21]   2.50% [12],[13],[16],[18],[21]   2.50% [10],[14],[15],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[15],[17],[24]     $ 1,276    
Ending balance [3],[12],[16],[18],[21] $ 652   $ 652    
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 2.50% [12],[16],[18]   2.50% [12],[16],[18]   2.50% [10],[15],[17]
PIK Rate 2.50% [12],[13],[16],[18]   2.50% [12],[13],[16],[18]   2.50% [10],[14],[15],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[15],[17]     $ 0    
Ending balance [3],[12],[16],[18] $ 0   0    
Investment, Identifier [Axis]: HPEP 3, L.P. | LP Interests (HPEP 3, L.P.)          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       194  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       4,472  
Gross Additions       195  
Gross Reductions       205  
Ending balance   4,462   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 5,295  
Amount of Unrealized Gain/(Loss)     60 (4,939)  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,897 [1],[5],[36],[40],[41] 8,740  
Gross Additions     60 3,875  
Gross Reductions     0 11,001  
Ending balance 1,957 [3],[6],[38],[42],[43] 1,614 1,957 [3],[6],[38],[42],[43] 1,614  
Investment, Identifier [Axis]: Harris Preston Fund Investments | LP Interests (423 AER II, LP)          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[36],[40],[41]     1,590    
Ending balance [3],[12],[38],[42],[43] 2,089   2,089    
Investment, Identifier [Axis]: Harris Preston Fund Investments | LP Interests (HPEP 3, L.P.)          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     (58)    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7],[36],[40],[41]     4,116    
Gross Additions     0    
Gross Reductions     310    
Ending balance [3],[8],[38],[42],[43] 3,806   3,806    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Preferred Member Units 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[25]     6,580    
Ending balance [3],[12],[26] 6,580   6,580    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Preferred Member Units 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[33]     350    
Ending balance [3],[12],[34] $ 350   $ 350    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10],[24]         9.98%
Spread 6.00% [12],[19],[20],[21]   6.00% [12],[19],[20],[21]   6.00% [10],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[24]     $ 805    
Ending balance [3],[12],[20],[21] $ 0   0    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10]         11.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     9,744    
Ending balance [3],[12],[20] 0   0    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 3          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[20] $ 0   $ 0    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [12] 12.00%   12.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12] $ 10,879   $ 10,879    
Investment, Identifier [Axis]: Hornblower Sub, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.17% [12],[18],[21],[27]   9.17% [12],[18],[21],[27]   9.32% [10],[17],[24],[28]
Spread 5.50% [12],[18],[19],[21],[27]   5.50% [12],[18],[19],[21],[27]   5.50% [10],[17],[22],[24],[28]
PIK Rate [12],[13],[18],[21],[27] 1.50%   1.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[28]     $ 2,348    
Ending balance [3],[12],[18],[21],[27] $ 960   $ 960    
Investment, Identifier [Axis]: Hornblower Sub, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.18% [12],[18],[21]   9.18% [12],[18],[21]   9.46% [10],[17],[24]
Spread 5.50% [12],[18],[19],[21]   5.50% [12],[18],[19],[21]   5.50% [10],[17],[22],[24]
PIK Rate [12],[13],[18],[21] 1.50%   1.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 16,082    
Ending balance [3],[12],[18],[21] $ 16,526   $ 16,526    
Investment, Identifier [Axis]: Horwitz Holdings, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [12],[18],[19],[20],[21] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[20],[21] $ (78)   $ (78)    
Investment, Identifier [Axis]: Horwitz Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Spread [12],[18],[19],[20],[21] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[20],[21] $ (52)   $ (52)    
Investment, Identifier [Axis]: Horwitz Holdings, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21] 9.23%   9.23%    
Spread [12],[18],[19],[21] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[21] $ 12,975   $ 12,975    
Investment, Identifier [Axis]: Hybrid Promotions, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 11.94% [12],[18],[21]   11.94% [12],[18],[21]   12.24% [10],[17],[24]
Spread 8.25% [12],[18],[19],[21]   8.25% [12],[18],[19],[21]   8.25% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 8,000    
Ending balance [3],[12],[18],[21] $ 8,000   8,000    
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)     790 830  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     7,010 [1],[7] 4,060  
Gross Additions     790 830  
Gross Reductions     0 0  
Ending balance $ 7,800 [3],[8] $ 4,890 $ 7,800 [3],[8] $ 4,890  
Investment, Identifier [Axis]: IG Investor, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 13.00% [8] 13.00% 13.00% [8] 13.00% 13.00% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (3) 18  
Amount of Interest, Fees or Dividends Credited to Income     23 31  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     400 [1],[7] 379  
Gross Additions     3 21  
Gross Reductions     203 0  
Ending balance $ 200 [3],[8] $ 400 $ 200 [3],[8] $ 400  
Investment, Identifier [Axis]: IG Investor, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.00% [8] 13.00% 13.00% [8] 13.00% 13.00% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (31) 156  
Amount of Interest, Fees or Dividends Credited to Income     588 600  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     8,766 [1],[7] 8,693  
Gross Additions     31 183  
Gross Reductions     431 110  
Ending balance $ 8,366 [3],[8] $ 8,766 $ 8,366 [3],[8] 8,766  
Investment, Identifier [Axis]: IG Parent Corporation | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [11],[12],[21] 9.49%   9.49%    
Spread 5.75% [11],[12],[19],[21]   5.75% [11],[12],[19],[21]   5.75% [9],[10],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[23],[24]     $ 0    
Ending balance [3],[11],[12],[21] $ 102   $ 102    
Investment, Identifier [Axis]: IG Parent Corporation | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.49% [11],[12],[21]   9.49% [11],[12],[21]   9.57% [9],[10],[24]
Spread 5.75% [11],[12],[19],[21]   5.75% [11],[12],[19],[21]   5.75% [9],[10],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[24]     $ 6,138    
Ending balance [3],[11],[12],[21] $ 6,106   $ 6,106    
Investment, Identifier [Axis]: IG Parent Corporation | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.49% [11],[12],[21]   9.49% [11],[12],[21]   9.57% [9],[10],[24]
Spread 5.75% [11],[12],[19],[21]   5.75% [11],[12],[19],[21]   5.75% [9],[10],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[24]     $ 1,902    
Ending balance [3],[11],[12],[21] $ 1,892   $ 1,892    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.90% [12],[21]   10.90% [12],[21]   11.15% [10],[24]
Spread 7.00% [12],[19],[21]   7.00% [12],[19],[21]   7.00% [10],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[24]     $ 295    
Ending balance [3],[12],[21] $ 295   $ 295    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.90% [12],[21]   10.90% [12],[21]   11.15% [10],[24]
Spread 7.00% [12],[19],[21]   7.00% [12],[19],[21]   7.00% [10],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[24]     $ 1,327    
Ending balance [3],[12],[21] $ 1,622   $ 1,622    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.90% [12],[21]   10.90% [12],[21]   11.15% [10],[24]
Spread 7.00% [12],[19],[21]   7.00% [12],[19],[21]   7.00% [10],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[24]     $ 1,234    
Ending balance [3],[12],[21] $ 1,234   $ 1,234    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 10.90% [12],[21]   10.90% [12],[21]   11.15% [10],[24]
Spread 7.00% [12],[19],[21]   7.00% [12],[19],[21]   7.00% [10],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[24]     $ 1,234    
Ending balance [3],[12],[21] $ 1,234   $ 1,234    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate 10.90% [12],[21]   10.90% [12],[21]   11.15% [10],[24]
Spread 7.00% [12],[19],[21]   7.00% [12],[19],[21]   7.00% [10],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[24]     $ 443    
Ending balance [3],[12],[21] $ 443   $ 443    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Secured Debt 6          
Schedule of Investments [Line Items]          
Total Rate [12],[21] 10.90%   10.90%    
Spread [12],[19],[21] 7.00%   7.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[21] $ 590   $ 590    
Investment, Identifier [Axis]: ITA Holdings Group, LLC | Warrants          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[25],[31]     3,810    
Ending balance [3],[12],[26],[32] $ 3,710   $ 3,710    
Investment, Identifier [Axis]: Ignite Visibility LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 8.69% [12],[18],[21]   8.69% [12],[18],[21]   8.84% [10],[17],[24]
Spread 5.00% [12],[18],[19],[21]   5.00% [12],[18],[19],[21]   5.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 7,816    
Ending balance [3],[12],[18],[21] $ 7,929   $ 7,929    
Investment, Identifier [Axis]: Ignite Visibility LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.69% [12],[18],[21]   10.69% [12],[18],[21]   10.84% [10],[17],[24]
Spread 7.00% [12],[18],[19],[21]   7.00% [12],[18],[19],[21]   7.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 7,816    
Ending balance [3],[12],[18],[21] $ 7,926   7,926    
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C. | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     540    
Ending balance [3],[12],[18],[26] 540   540    
Investment, Identifier [Axis]: Implus Footcare, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     4,490    
Ending balance [3],[12],[18] $ 5,200   $ 5,200    
Investment, Identifier [Axis]: Implus Footcare, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.74% [12],[18],[21]   9.74% [12],[18],[21]   9.68% [10],[17],[24]
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   6.00% [10],[17],[22],[24]
PIK Rate 4.00% [12],[13],[18],[21]   4.00% [12],[13],[18],[21]   4.00% [10],[14],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 1,776    
Ending balance [3],[12],[18],[21] $ 1,812   $ 1,812    
Investment, Identifier [Axis]: Implus Footcare, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.74% [12],[18],[21]   9.74% [12],[18],[21]   9.68% [10],[17],[24]
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   6.00% [10],[17],[22],[24]
PIK Rate 9.74% [12],[13],[18],[21]   9.74% [12],[13],[18],[21]   9.68% [10],[14],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 4,044    
Ending balance [3],[12],[18],[21] $ 4,244   4,244    
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)     (30) (230)  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     6,790 [1],[7],[17] 7,290  
Gross Additions     0 0  
Gross Reductions     30 230  
Ending balance 6,760 [3],[8],[18] 7,060 6,760 [3],[8],[18] 7,060  
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC | Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[25]     2,040    
Ending balance [3],[12],[26] 4,200   4,200    
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [10]         12.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     3,825    
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC | Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[20] $ 0   $ 0    
Investment, Identifier [Axis]: Infinity X1 Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12] 12.00%   12.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12] $ 3,712   $ 3,712    
Investment, Identifier [Axis]: Insight Borrower Corporation | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     100    
Ending balance [3],[12],[18] $ 10   $ 10    
Investment, Identifier [Axis]: Insight Borrower Corporation | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.95% [12],[18],[21]   9.95% [12],[18],[21]   10.10% [10],[17],[24]
Spread 6.25% [12],[18],[19],[21]   6.25% [12],[18],[19],[21]   6.25% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 1,574    
Ending balance [3],[12],[18],[21] $ 659   $ 659    
Investment, Identifier [Axis]: Insight Borrower Corporation | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.92% [12],[18],[21]   9.92% [12],[18],[21]   10.12% [10],[17],[24]
Spread 6.25% [12],[18],[19],[21]   6.25% [12],[18],[19],[21]   6.25% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 15,424    
Ending balance [3],[12],[18],[21] $ 15,010   15,010    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     75    
Ending balance [3],[12],[18] $ 75   $ 75    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 13.22% [12],[18],[21],[27]   13.22% [12],[18],[21],[27]   13.97% [10],[17],[24],[28]
Spread 9.50% [12],[18],[19],[21],[27]   9.50% [12],[18],[19],[21],[27]   10.00% [10],[17],[22],[24],[28]
PIK Rate 1.50% [12],[13],[18],[21],[27]   1.50% [12],[13],[18],[21],[27]   2.00% [10],[14],[17],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[28]     $ 691    
Ending balance [3],[12],[18],[21],[27] $ 700   $ 700    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.22% [12],[18],[21]   13.22% [12],[18],[21]   13.97% [10],[17],[24]
Spread 9.50% [12],[18],[19],[21]   9.50% [12],[18],[19],[21]   10.00% [10],[17],[22],[24]
PIK Rate 1.50% [12],[13],[18],[21]   1.50% [12],[13],[18],[21]   2.00% [10],[14],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 5,901    
Ending balance [3],[12],[18],[21] $ 5,910   $ 5,910    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 13.22% [12],[18],[21]   13.22% [12],[18],[21]   13.97% [10],[17],[24]
Spread 9.50% [12],[18],[19],[21]   9.50% [12],[18],[19],[21]   10.00% [10],[17],[22],[24]
PIK Rate 1.50% [12],[13],[18],[21]   1.50% [12],[13],[18],[21]   2.00% [10],[14],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 1,188    
Ending balance [3],[12],[18],[21] $ 1,190   $ 1,190    
Investment, Identifier [Axis]: Inspire Aesthetics Management, LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 13.22% [12],[18],[21]   13.22% [12],[18],[21]   13.97% [10],[17],[24]
Spread 9.50% [12],[18],[19],[21]   9.50% [12],[18],[19],[21]   10.00% [10],[17],[22],[24]
PIK Rate 1.50% [12],[13],[18],[21]   1.50% [12],[13],[18],[21]   2.00% [10],[14],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 274    
Ending balance [3],[12],[18],[21] $ 274   274    
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)     80 170  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     410 [1],[7],[17] 640  
Gross Additions     80 170  
Gross Reductions     0 0  
Ending balance $ 490 [3],[8],[18] $ 810 $ 490 [3],[8],[18] $ 810  
Investment, Identifier [Axis]: Integral Energy Services | Preferred Equity 1          
Schedule of Investments [Line Items]          
Total Rate 10.00% [8],[18],[26] 10.00% 10.00% [8],[18],[26] 10.00% 10.00% [7],[17],[25]
PIK Rate 10.00% [8],[13],[18],[26] 10.00% 10.00% [8],[13],[18],[26] 10.00% 10.00% [7],[14],[17],[25]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 60  
Amount of Interest, Fees or Dividends Credited to Income     17 15  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     490 [1],[7],[17],[25] 535  
Gross Additions     17 75  
Gross Reductions     0 0  
Ending balance $ 507 [3],[8],[18],[26] $ 610 $ 507 [3],[8],[18],[26] $ 610  
Investment, Identifier [Axis]: Integral Energy Services | Preferred Equity 2          
Schedule of Investments [Line Items]          
Total Rate 10.00% [8],[18] 10.00% 10.00% [8],[18] 10.00% 10.00% [7],[17]
PIK Rate 10.00% [8],[13],[18] 10.00% 10.00% [8],[13],[18] 10.00% 10.00% [7],[14],[17]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     90 97  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     480 [1],[7],[17] 0  
Gross Additions     90 230  
Gross Reductions     0 0  
Ending balance $ 570 [3],[8],[18] $ 230 $ 570 [3],[8],[18] $ 230  
Investment, Identifier [Axis]: Integral Energy Services | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 11.46% [8],[18],[21] 12.06% 11.46% [8],[18],[21] 12.06% 11.75% [7],[17],[24]
Spread 7.50% [8],[18],[19],[21] 7.50% 7.50% [8],[18],[19],[21] 7.50% 7.50% [7],[17],[22],[24]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (62) (217)  
Amount of Interest, Fees or Dividends Credited to Income     855 979  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     14,071 [1],[7],[17],[24] 14,872  
Gross Additions     0 33  
Gross Reductions     202 968  
Ending balance $ 13,869 [3],[8],[18],[21] $ 13,937 13,869 [3],[8],[18],[21] 13,937  
Investment, Identifier [Axis]: Interface Security Systems, L.L.C | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     0    
Ending balance [3],[12],[18] $ 0   $ 0    
Investment, Identifier [Axis]: Interface Security Systems, L.L.C | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 13.77% [12],[18],[27],[35]   13.77% [12],[18],[27],[35]   13.92% [10],[17],[28],[44]
Spread 10.00% [12],[18],[19],[27],[35]   10.00% [12],[18],[19],[27],[35]   10.00% [10],[17],[22],[28],[44]
PIK Rate 13.77% [12],[13],[18],[27],[35]   13.77% [12],[13],[18],[27],[35]   13.92% [10],[14],[17],[28],[44]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[28],[44]     $ 2,078    
Ending balance [3],[12],[18],[27],[35] $ 2,333   $ 2,333    
Investment, Identifier [Axis]: Interface Security Systems, L.L.C | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.74% [12],[16],[18],[21],[35]   10.74% [12],[16],[18],[21],[35]   11.02% [10],[15],[17],[24],[44]
Spread 7.00% [12],[16],[18],[19],[21],[35]   7.00% [12],[16],[18],[19],[21],[35]   7.00% [10],[15],[17],[22],[24],[44]
PIK Rate 10.74% [12],[13],[16],[18],[21],[35]   10.74% [12],[13],[16],[18],[21],[35]   11.02% [10],[14],[15],[17],[24],[44]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[15],[17],[24],[44]     $ 1    
Ending balance [3],[12],[16],[18],[21],[35] $ 19   $ 19    
Investment, Identifier [Axis]: Invincible Boat Company, LLC. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.29% [12],[18],[21],[27]   11.29% [12],[18],[21],[27]   11.37% [10],[17],[24],[28]
Spread 7.50% [12],[18],[19],[21],[27]   7.50% [12],[18],[19],[21],[27]   7.50% [10],[17],[22],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[28]     $ 1,319    
Ending balance [3],[12],[18],[21],[27] $ 738   $ 738    
Investment, Identifier [Axis]: Invincible Boat Company, LLC. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.29% [12],[18],[21]   11.29% [12],[18],[21]   11.37% [10],[17],[24]
Spread 7.50% [12],[18],[19],[21]   7.50% [12],[18],[19],[21]   7.50% [10],[17],[22],[24]
PIK Rate 11.29% [12],[13],[18],[21]   11.29% [12],[13],[18],[21]   3.37% [10],[14],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 15,247    
Ending balance [3],[12],[18],[21] $ 13,269   13,269    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     680    
Ending balance [3],[12] $ 710   $ 710    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Preferred Equity 1          
Schedule of Investments [Line Items]          
Total Rate 25.00% [12]   25.00% [12]   25.00% [10]
PIK Rate 25.00% [12],[13]   25.00% [12],[13]   25.00% [10],[14]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 260    
Ending balance [3],[12] $ 290   $ 290    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Preferred Equity 2          
Schedule of Investments [Line Items]          
Total Rate 25.00% [12]   25.00% [12]   25.00% [10]
PIK Rate 25.00% [12],[13]   25.00% [12],[13]   25.00% [10],[14]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 39    
Ending balance [3],[12] $ 39   $ 39    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Preferred Equity 3          
Schedule of Investments [Line Items]          
Total Rate [12] 25.00%   25.00%    
PIK Rate [12],[13] 25.00%   25.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12] $ 34   $ 34    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10]         13.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     1,118    
Ending balance [3],[12],[20] $ (6)   $ (6)    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.00% [12]   13.00% [12]   13.00% [10]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 728    
Ending balance [3],[12] $ 12,595   12,595    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [10]         13.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     2,236    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [10]         13.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     4,364    
Investment, Identifier [Axis]: Iron-Main Investments, LLC | Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate [10]         13.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     2,335    
Investment, Identifier [Axis]: Isagenix International, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10]     0    
Ending balance [3],[11],[12] $ 0   $ 0    
Investment, Identifier [Axis]: Isagenix International, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 12.27% [11],[12],[16],[21]   12.27% [11],[12],[16],[21]   2.50% [9],[10],[24],[51]
Spread [11],[12],[16],[19],[21] 8.50%   8.50%    
PIK Rate [11],[12],[13],[16],[21] 9.77%   9.77%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[24],[51]     $ 429    
Ending balance [3],[11],[12],[16],[21] $ 429   $ 429    
Investment, Identifier [Axis]: Island Pump and Tank, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.95% [12],[18],[21]   10.95% [12],[18],[21]   11.25% [10],[17],[24]
Spread 7.00% [12],[18],[19],[21]   7.00% [12],[18],[19],[21]   7.00% [10],[17],[22],[24]
PIK Rate [12],[13],[18],[21] 10.95%   10.95%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 443    
Ending balance [3],[12],[18],[21] $ 395   $ 395    
Investment, Identifier [Axis]: Island Pump and Tank, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.95% [12],[18],[21],[49]   10.95% [12],[18],[21],[49]   10.25% [10],[17],[24],[50]
Spread 7.00% [12],[18],[19],[21],[49]   7.00% [12],[18],[19],[21],[49]   6.00% [10],[17],[22],[24],[50]
PIK Rate [12],[13],[18],[21],[49] 10.95%   10.95%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[50]     $ 2,048    
Ending balance [3],[12],[18],[21],[49] $ 1,824   $ 1,824    
Investment, Identifier [Axis]: Island Pump and Tank, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.95% [12],[18],[21],[49]   10.95% [12],[18],[21],[49]   11.25% [10],[17],[24],[50]
Spread 7.00% [12],[18],[19],[21],[49]   7.00% [12],[18],[19],[21],[49]   7.00% [10],[17],[22],[24],[50]
PIK Rate [12],[13],[18],[21],[49] 10.95%   10.95%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[50]     $ 2,048    
Ending balance [3],[12],[18],[21],[49] $ 1,828   $ 1,828    
Investment, Identifier [Axis]: Island Pump and Tank, LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 10.95% [12],[18],[21],[49]   10.95% [12],[18],[21],[49]   12.25% [10],[17],[24],[50]
Spread 7.00% [12],[18],[19],[21],[49]   7.00% [12],[18],[19],[21],[49]   8.00% [10],[17],[22],[24],[50]
PIK Rate [12],[13],[18],[21],[49] 10.95%   10.95%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[50]     $ 2,048    
Ending balance [3],[12],[18],[21],[49] $ 1,832   1,832    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Common Equity 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     0    
Ending balance [3],[12],[18] 0   0    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Common Equity 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     0    
Ending balance [3],[12],[18] $ 0   $ 0    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 8.89% [12],[16],[18],[21]   8.89% [12],[16],[18],[21]   9.13% [10],[17],[24]
Spread 5.00% [12],[16],[18],[19],[21]   5.00% [12],[16],[18],[19],[21]   5.00% [10],[17],[22],[24]
PIK Rate [12],[13],[16],[18],[21] 8.89%   8.89%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 526    
Ending balance [3],[12],[16],[18],[21] $ 523   $ 523    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.89% [12],[16],[18],[21]   9.89% [12],[16],[18],[21]   10.13% [10],[17],[24]
Spread 6.00% [12],[16],[18],[19],[21]   6.00% [12],[16],[18],[19],[21]   6.00% [10],[17],[22],[24]
PIK Rate 9.89% [12],[13],[16],[18],[21]   9.89% [12],[13],[16],[18],[21]   10.13% [10],[14],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 3,036    
Ending balance [3],[12],[16],[18],[21] $ 640   $ 640    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 15.00% [12],[16],[18]   15.00% [12],[16],[18]   15.00% [10],[15],[17]
PIK Rate 15.00% [12],[13],[16],[18]   15.00% [12],[13],[16],[18]   15.00% [10],[14],[15],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[15],[17]     $ 78    
Ending balance [3],[12],[16],[18] $ 0   0    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     1,500    
Ending balance [3],[12],[18] $ 1,300   $ 1,300    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.31% [12],[18],[21],[49]   11.31% [12],[18],[21],[49]   11.01% [10],[17],[24],[50]
Spread 7.50% [12],[18],[19],[21],[49]   7.50% [12],[18],[19],[21],[49]   7.00% [10],[17],[22],[24],[50]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[50]     $ 1,501    
Ending balance [3],[12],[18],[21],[49] $ 1,458   $ 1,458    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.32% [12],[18],[21],[49]   11.32% [12],[18],[21],[49]   11.23% [10],[17],[24],[50]
Spread 7.50% [12],[18],[19],[21],[49]   7.50% [12],[18],[19],[21],[49]   7.00% [10],[17],[22],[24],[50]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[50]     $ 1,251    
Ending balance [3],[12],[18],[21],[49] $ 1,251   $ 1,251    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 11.32% [12],[18],[21],[49]   11.32% [12],[18],[21],[49]   11.11% [10],[17],[24],[50]
Spread 7.50% [12],[18],[19],[21],[49]   7.50% [12],[18],[19],[21],[49]   7.00% [10],[17],[22],[24],[50]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[50]     $ 1,333    
Ending balance [3],[12],[18],[21],[49] $ 1,333   $ 1,333    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc. | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 11.32% [12],[18],[21]   11.32% [12],[18],[21]   10.84% [10],[17],[24]
Spread 7.50% [12],[18],[19],[21]   7.50% [12],[18],[19],[21]   7.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 3,476    
Ending balance [3],[12],[18],[21] $ 3,370   3,370    
Investment, Identifier [Axis]: Joerns Healthcare, LLC | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10]     290    
Ending balance [3],[11],[12] $ 230   $ 230    
Investment, Identifier [Axis]: Joerns Healthcare, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.76% [11],[12],[21]   11.76% [11],[12],[21]   11.94% [9],[10],[24]
Spread 8.00% [11],[12],[19],[21]   8.00% [11],[12],[19],[21]   8.00% [9],[10],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[24]     $ 1,523    
Ending balance [3],[11],[12],[21] $ 1,523   $ 1,523    
Investment, Identifier [Axis]: Joerns Healthcare, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.76% [11],[12],[21]   11.76% [11],[12],[21]   11.94% [9],[10],[24]
Spread 8.00% [11],[12],[19],[21]   8.00% [11],[12],[19],[21]   8.00% [9],[10],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[24]     $ 1,137    
Ending balance [3],[11],[12],[21] $ 1,137   1,137    
Investment, Identifier [Axis]: JorVet Holdings, LLC | Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[25]     1,220    
Ending balance [3],[12],[26] $ 1,530   $ 1,530    
Investment, Identifier [Axis]: JorVet Holdings, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 12.00% [12]   12.00% [12]   12.00% [10]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 2,578    
Ending balance [3],[12] $ 2,584   2,584    
Investment, Identifier [Axis]: KMS, LLC | Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     7,830 [1],[7],[17] 0  
Gross Additions     0 6,113  
Gross Reductions     0 0  
Ending balance $ 7,830 [3],[8],[18] $ 6,113 $ 7,830 [3],[8],[18] $ 6,113  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.23% [8],[18],[21] 14.50% 9.23% [8],[18],[21] 14.50%  
Spread 5.50% [8],[18],[19],[21] 9.75% 5.50% [8],[18],[19],[21] 9.75% 5.50% [7],[17],[22],[23],[24]
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     $ (49) [1],[7],[17],[23],[24] 829  
Gross Additions       0  
Gross Reductions       829  
Ending balance $ 679 [3],[8],[18],[21] $ 0 $ 679 [3],[8],[18],[21] $ 0  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 1.1          
Schedule of Investments [Line Items]          
Total Rate 12.50%   12.50%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     24    
Amount of Interest, Fees or Dividends Credited to Income     101    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,433    
Gross Additions     33    
Gross Reductions     0    
Ending balance $ 1,466   $ 1,466    
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.50% [8],[18] 14.50% 12.50% [8],[18] 14.50% 12.50% [7],[17]
Spread   9.75%   9.75%  
Amount of Realized Gain/(Loss)       $ (3,788)  
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     $ 1,433 [1],[7],[17] 5,973  
Gross Additions       0  
Gross Reductions       5,973  
Ending balance $ 1,466 [3],[8],[18] $ 0 $ 1,466 [3],[8],[18] $ 0  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 2.1          
Schedule of Investments [Line Items]          
Total Rate 12.50%   12.50%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     76    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,259    
Gross Additions     0    
Gross Reductions     190    
Ending balance $ 1,069   $ 1,069    
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 12.50% [8],[18]   12.50% [8],[18]   12.50% [7],[17]
Spread   9.75%   9.75%  
PIK Rate   14.23%   14.23%  
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     $ 1,259 [1],[7],[17] 562  
Gross Additions       0  
Gross Reductions       562  
Ending balance $ 1,069 [3],[8],[18] $ 0 $ 1,069 [3],[8],[18] $ 0  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 3.1          
Schedule of Investments [Line Items]          
Total Rate 9.23%   9.23%    
Spread 5.50%   5.50%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     40    
Amount of Interest, Fees or Dividends Credited to Income     52    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     (49)    
Gross Additions     1,678    
Gross Reductions     950    
Ending balance $ 679   679    
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Spread   9.75%   9.75%  
PIK Rate   14.23%   14.23%  
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       550  
Gross Additions       0  
Gross Reductions       550  
Ending balance   $ 0   $ 0  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate   14.23%   14.23%  
Spread   9.75%   9.75%  
PIK Rate   14.23%   14.23%  
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   $ 0  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 6          
Schedule of Investments [Line Items]          
Total Rate   12.50%   12.50%  
PIK Rate   12.50%   12.50%  
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       76  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       0  
Gross Additions       1,392  
Gross Reductions       0  
Ending balance   $ 1,392   $ 1,392  
Investment, Identifier [Axis]: KMS, LLC | Secured Debt 7          
Schedule of Investments [Line Items]          
Total Rate   12.50%   12.50%  
PIK Rate   12.50%   12.50%  
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       70  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       0  
Gross Additions       1,476  
Gross Reductions       0  
Ending balance   $ 1,476   1,476  
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     12 15  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,048 [1],[7],[25],[33] 678  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 1,048 [3],[8],[26],[34] 678 1,048 [3],[8],[26],[34] 678  
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)     670 510  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,290 [1],[7],[25] 3,060  
Gross Additions     670 510  
Gross Reductions     0 0  
Ending balance $ 4,960 [3],[8],[26] $ 3,570 $ 4,960 [3],[8],[26] $ 3,570  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.50% [8] 12.00% 11.50% [8] 12.00% 11.50% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     160 211  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,547 [1],[7] 3,741  
Gross Additions     508 3  
Gross Reductions     200 400  
Ending balance $ 2,855 [3],[8] $ 3,344 $ 2,855 [3],[8] $ 3,344  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.00% [8] 9.00% 9.00% [8] 9.00% 9.00% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     44 45  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     970 [1],[7] 982  
Gross Additions     0 0  
Gross Reductions     6 6  
Ending balance $ 964 [3],[8] $ 976 964 [3],[8] 976  
Investment, Identifier [Axis]: LBCT Topco LP | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12] $ 1,000   $ 1,000    
Investment, Identifier [Axis]: LLFlex, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 11.84% [12],[18],[21]   11.84% [12],[18],[21]   12.14% [10],[17],[24]
Spread 8.00% [12],[18],[19],[21]   8.00% [12],[18],[19],[21]   8.00% [10],[17],[22],[24]
PIK Rate 3.00% [12],[13],[18],[21]   3.00% [12],[13],[18],[21]   3.00% [10],[14],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 3,698    
Ending balance [3],[12],[18],[21] $ 3,975   $ 3,975    
Investment, Identifier [Axis]: Logix Acquisition Company, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.67% [12],[18],[21]   10.67% [12],[18],[21]   11.41% [10],[17],[24]
Spread 7.00% [12],[18],[19],[21]   7.00% [12],[18],[19],[21]   7.50% [10],[17],[22],[24]
PIK Rate 1.25% [12],[13],[18],[21]   1.25% [12],[13],[18],[21]   2.75% [10],[14],[17],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 20,551    
Ending balance [3],[12],[18],[21] $ 20,711   20,711    
Investment, Identifier [Axis]: Logix Acquisition Company, LLC | Secured Debt 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     1,027    
Ending balance [3],[12],[18] 1,079   1,079    
Investment, Identifier [Axis]: MCT Purchaserco Holding Inc. | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[36],[37]     619    
Ending balance [3],[12],[18],[38],[39] $ 675   $ 675    
Investment, Identifier [Axis]: MCT Purchaserco Holding Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.23% [12],[18],[21],[38],[39]   9.23% [12],[18],[21],[38],[39]   9.36% [10],[17],[24],[36],[37]
Spread 5.50% [12],[18],[19],[21],[38],[39]   5.50% [12],[18],[19],[21],[38],[39]   5.50% [10],[17],[22],[24],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 3,250    
Ending balance [3],[12],[18],[21],[38],[39] $ 5,475   $ 5,475    
Investment, Identifier [Axis]: MCT Purchaserco Holding Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.23% [12],[18],[21],[38],[39]   9.23% [12],[18],[21],[38],[39]   9.29% [10],[17],[24],[36],[37]
Spread 5.50% [12],[18],[19],[21],[38],[39]   5.50% [12],[18],[19],[21],[38],[39]   5.50% [10],[17],[22],[24],[36],[37]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 21,375    
Ending balance [3],[12],[18],[21],[38],[39] $ 21,479   21,479    
Investment, Identifier [Axis]: Metalforming Holdings, LLC | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[25]     720    
Ending balance [3],[12],[26] $ 780   $ 780    
Investment, Identifier [Axis]: Metalforming Holdings, LLC | Preferred Equity          
Schedule of Investments [Line Items]          
Total Rate 8.00% [12],[26]   8.00% [12],[26]   8.00% [10],[25]
PIK Rate 8.00% [12],[13],[26]   8.00% [12],[13],[26]   8.00% [10],[14],[25]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[25]     $ 434    
Ending balance [3],[12],[26] $ 434   434    
Investment, Identifier [Axis]: Metalforming Holdings, LLC | Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[23],[44]     0    
Ending balance [3],[12],[20] $ 0   $ 0    
Investment, Identifier [Axis]: Metalforming Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 8.75% [12]   8.75% [12]   8.75% [10]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 1,266    
Ending balance [3],[12] $ 1,266   $ 1,266    
Investment, Identifier [Axis]: Microbe Formulas, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.50% [12],[18],[19],[20],[21]   5.50% [12],[18],[19],[20],[21]   5.50% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (3)    
Ending balance [3],[12],[18],[20],[21] $ (2)   $ (2)    
Investment, Identifier [Axis]: Microbe Formulas, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.24% [12],[18],[21]   9.24% [12],[18],[21]   9.32% [10],[17],[24]
Spread 5.50% [12],[18],[19],[21]   5.50% [12],[18],[19],[21]   5.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 1,328    
Ending balance [3],[12],[18],[21] $ 1,321   $ 1,321    
Investment, Identifier [Axis]: Microbe Formulas, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.24% [12],[18],[21]   9.24% [12],[18],[21]   9.32% [10],[17],[24]
Spread 5.50% [12],[18],[19],[21]   5.50% [12],[18],[19],[21]   5.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 1,673    
Ending balance [3],[12],[18],[21] $ 1,369   1,369    
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC | Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (631) (1,225)  
Amount of Interest, Fees or Dividends Credited to Income     457 449  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     10,134 [1],[7],[17],[25],[33] 11,166  
Gross Additions     457 450  
Gross Reductions     631 1,226  
Ending balance $ 9,960 [3],[8],[18],[26],[34] $ 10,390 $ 9,960 [3],[8],[18],[26],[34] $ 10,390  
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate   9.79%   9.79%  
Spread   5.50%   5.50%  
PIK Rate   9.79%   9.79%  
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       93  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       0  
Gross Additions       2,230  
Gross Reductions       0  
Ending balance   $ 2,230   2,230  
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.16% [8],[18],[21]   9.16% [8],[18],[21]   9.81% [7],[17],[24]
Spread 5.50% [8],[18],[19],[21]   5.50% [8],[18],[19],[21]   5.50% [7],[17],[22],[24]
PIK Rate 9.16% [8],[13],[18],[21]   9.16% [8],[13],[18],[21]   9.81% [7],[14],[17],[24]
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     46    
Amount of Interest, Fees or Dividends Credited to Income     114    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7],[17],[24]     2,256    
Gross Additions     161    
Gross Reductions     0    
Ending balance [3],[8],[18],[21] $ 2,417   $ 2,417    
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.17% [8],[18],[21]   9.17% [8],[18],[21]   9.32% [7],[17],[24]
Spread 5.50% [8],[18],[19],[21]   5.50% [8],[18],[19],[21]   5.50% [7],[17],[22],[24]
PIK Rate 9.17% [8],[13],[18],[21]   9.17% [8],[13],[18],[21]   9.32% [7],[14],[17],[24]
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     30    
Amount of Interest, Fees or Dividends Credited to Income     64    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7],[17],[24]     1,344    
Gross Additions     91    
Gross Reductions     0    
Ending balance [3],[8],[18],[21] $ 1,435   1,435    
Investment, Identifier [Axis]: Mini Melts of America, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     190    
Ending balance [3],[12],[18] $ 90   $ 90    
Investment, Identifier [Axis]: Mini Melts of America, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.92% [12],[18],[21],[27]   9.92% [12],[18],[21],[27]   10.06% [10],[17],[24],[28]
Spread 6.25% [12],[18],[19],[21],[27]   6.25% [12],[18],[19],[21],[27]   6.25% [10],[17],[22],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[28]     $ 888    
Ending balance [3],[12],[18],[21],[27] $ 1,015   $ 1,015    
Investment, Identifier [Axis]: Mini Melts of America, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.91% [12],[18],[21],[49]   9.91% [12],[18],[21],[49]   10.05% [10],[17],[24],[50]
Spread 6.25% [12],[18],[19],[21],[49]   6.25% [12],[18],[19],[21],[49]   6.25% [10],[17],[22],[24],[50]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[50]     $ 813    
Ending balance [3],[12],[18],[21],[49] $ 762   $ 762    
Investment, Identifier [Axis]: Mini Melts of America, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 8.92% [12],[18],[21]   8.92% [12],[18],[21]   9.07% [10],[17],[24]
Spread 5.25% [12],[18],[19],[21]   5.25% [12],[18],[19],[21]   5.25% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 3,012    
Ending balance [3],[12],[18],[21] $ 2,689   $ 2,689    
Investment, Identifier [Axis]: Mini Melts of America, LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 10.92% [12],[18],[21]   10.92% [12],[18],[21]   11.07% [10],[17],[24]
Spread 7.25% [12],[18],[19],[21]   7.25% [12],[18],[19],[21]   7.25% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 3,000    
Ending balance [3],[12],[18],[21] $ 2,690   2,690    
Investment, Identifier [Axis]: Mission Critical Group | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     6,690    
Ending balance [3],[12],[18] $ 17,960   $ 17,960    
Investment, Identifier [Axis]: Mission Critical Group | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.25% [12],[18],[19],[20],[21]   5.25% [12],[18],[19],[20],[21]   5.50% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (55)    
Ending balance [3],[12],[18],[20],[21] $ (18)   $ (18)    
Investment, Identifier [Axis]: Mission Critical Group | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[24]         9.33%
Spread 5.25% [12],[18],[19],[20],[21]   5.25% [12],[18],[19],[20],[21]   5.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 4,100    
Ending balance [3],[12],[18],[20],[21] $ (51)   $ (51)    
Investment, Identifier [Axis]: Mission Critical Group | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 8.93% [12],[18],[21]   8.93% [12],[18],[21]   9.23% [10],[17],[24]
Spread 5.25% [12],[18],[19],[21]   5.25% [12],[18],[19],[21]   5.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 18,438    
Ending balance [3],[12],[18],[21] $ 24,121   $ 24,121    
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC | Preferred Member Units          
Schedule of Investments [Line Items]          
Total Rate 12.00% [12],[26]   12.00% [12],[26]   12.00% [10],[25]
PIK Rate 12.00% [12],[13],[26]   12.00% [12],[13],[26]   12.00% [10],[14],[25]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[25]     $ 530    
Ending balance [3],[12],[26] $ 720   $ 720    
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 13.00% [12]   13.00% [12]   14.00% [10]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 1,891    
Ending balance [3],[12] $ 1,496   1,496    
Investment, Identifier [Axis]: MoneyThumb Acquisition, LLC | Warrants          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[31]     200    
Ending balance [3],[12],[32] 270   270    
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[36],[37]     204    
Ending balance [3],[12],[18],[38],[39] $ 127   $ 127    
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.00% [12],[18],[38],[39]   9.00% [12],[18],[38],[39]   10.18% [10],[17],[24],[36],[37]
Spread [10],[17],[22],[24],[36],[37]         6.25%
PIK Rate [12],[13],[18],[38],[39] 6.00%   6.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 1,272    
Ending balance [3],[12],[18],[38],[39] $ 1,254   $ 1,254    
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.00% [12],[18],[38],[39]   9.00% [12],[18],[38],[39]   10.18% [10],[17],[24],[36],[37]
Spread [10],[17],[22],[24],[36],[37]         6.25%
PIK Rate [12],[13],[18],[38],[39] 6.00%   6.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 3,544    
Ending balance [3],[12],[18],[38],[39] $ 3,472   $ 3,472    
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.00% [12],[18],[38],[39]   9.00% [12],[18],[38],[39]   10.18% [10],[17],[24],[36],[37]
Spread [10],[17],[22],[24],[36],[37]         6.25%
PIK Rate [12],[13],[18],[38],[39] 6.00%   6.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 5,164    
Ending balance [3],[12],[18],[38],[39] $ 5,231   $ 5,231    
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 9.00% [12],[18],[38],[39]   9.00% [12],[18],[38],[39]   10.18% [10],[17],[24],[36],[37]
Spread [10],[17],[22],[24],[36],[37]         6.25%
PIK Rate [12],[13],[18],[38],[39] 6.00%   6.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36],[37]     $ 359    
Ending balance [3],[12],[18],[38],[39] $ 350   350    
Investment, Identifier [Axis]: MonitorUS Holding, LLC | Unsecured Debt          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[36],[37]         8.00%
PIK Rate [10],[14],[17],[36],[37]         8.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[36],[37]     23    
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC | Common Stock          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       110  
Amount of Interest, Fees or Dividends Credited to Income       493  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       6,590  
Gross Additions       110  
Gross Reductions       0  
Ending balance   6,700   6,700  
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       0  
Gross Additions       0  
Gross Reductions       0  
Ending balance   $ 0   $ 0  
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate   10.00%   10.00%  
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       (1)  
Amount of Interest, Fees or Dividends Credited to Income       73  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       1,436  
Gross Additions       1  
Gross Reductions       1  
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)       670  
Amount of Interest, Fees or Dividends Credited to Income       100  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       3,890  
Gross Additions       670  
Gross Reductions       0  
Ending balance   $ 4,560   $ 4,560  
Investment, Identifier [Axis]: Nello Industries Investco, LLC | Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     1,560    
Amount of Interest, Fees or Dividends Credited to Income     103    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7],[25]     5,830    
Gross Additions     1,560    
Gross Reductions     0    
Ending balance [3],[8],[26] $ 7,390   $ 7,390    
Investment, Identifier [Axis]: Nello Industries Investco, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 13.00% [8]   13.00% [8]   12.50% [7]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7]     $ 8,018    
Ending balance [3],[8] $ 10,336   $ 10,336    
Investment, Identifier [Axis]: Nello Industries Investco, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 13.00%   13.00%    
Spread   6.50%   6.50%  
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (156) 0  
Amount of Interest, Fees or Dividends Credited to Income     243 12  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     8,018 (12)  
Gross Additions     0 12  
Gross Reductions     8,018 0  
Ending balance $ 0 $ 0 $ 0 $ 0  
Investment, Identifier [Axis]: Nello Industries Investco, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.00% 13.50% 13.00% 13.50%  
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     47 0  
Amount of Interest, Fees or Dividends Credited to Income     563 482  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 6,619  
Gross Additions     10,336 20  
Gross Reductions     0 0  
Ending balance $ 10,336 $ 6,639 10,336 6,639  
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)     130 130  
Amount of Interest, Fees or Dividends Credited to Income     10 108  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,210 [1],[7],[25] 2,970  
Gross Additions     130 130  
Gross Reductions     0 0  
Ending balance 3,340 [3],[8] 3,100 3,340 [3],[8] 3,100  
Investment, Identifier [Axis]: NexRev LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       0  
Gross Additions       0  
Gross Reductions       0  
Ending balance   0   0  
Investment, Identifier [Axis]: NexRev LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       (3)  
Amount of Interest, Fees or Dividends Credited to Income       38  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance       2,453  
Gross Additions       3  
Gross Reductions       2,456  
Ending balance   0   0  
Investment, Identifier [Axis]: NuStep, LLC | Preferred Member Units 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       160  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,530 [1],[7] 2,890  
Gross Additions       160  
Gross Reductions       0  
Ending balance 1,620 [3],[8] 3,050 1,620 [3],[8] 3,050  
Investment, Identifier [Axis]: NuStep, LLC | Preferred Member Units 1.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     (540)    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,050    
Gross Additions     0    
Gross Reductions     540    
Ending balance 2,510   2,510    
Investment, Identifier [Axis]: NuStep, LLC | Preferred Member Units 2          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,050 [1],[7] 1,500  
Gross Additions       0  
Gross Reductions       0  
Ending balance 2,510 [3],[8] $ 1,500 2,510 [3],[8] $ 1,500  
Investment, Identifier [Axis]: NuStep, LLC | Preferred Member Units 2.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     90    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,530    
Gross Additions     90    
Gross Reductions     0    
Ending balance $ 1,620   $ 1,620    
Investment, Identifier [Axis]: NuStep, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.22% [8],[21] 10.98% 10.22% [8],[21] 10.98% 10.48% [7],[24],[44]
Spread 6.50% [8],[19],[21] 6.50% 6.50% [8],[19],[21] 6.50% 6.50% [7],[22],[24],[44]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     38 51  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     250 [1],[7],[24],[44] 900  
Gross Additions     400 0  
Gross Reductions     0 300  
Ending balance $ 650 [3],[8],[21] $ 600 $ 650 [3],[8],[21] $ 600  
Investment, Identifier [Axis]: NuStep, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.00% [8] 12.00% 12.00% [8] 12.00% 12.00% [7],[44]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (124) 0  
Amount of Interest, Fees or Dividends Credited to Income     287 278  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     4,610 [1],[7],[44] 4,610  
Gross Additions     0 0  
Gross Reductions     188 0  
Ending balance $ 4,422 [3],[8] $ 4,610 $ 4,422 [3],[8] 4,610  
Investment, Identifier [Axis]: Obra Capital, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 7.50% [12],[18],[19],[20],[21]   7.50% [12],[18],[19],[20],[21]   7.25% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (10)    
Ending balance [3],[12],[18],[20],[21] $ (13)   $ (13)    
Investment, Identifier [Axis]: Obra Capital, Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.25% [12],[18],[21]   11.25% [12],[18],[21]   11.09% [10],[17],[24]
Spread 7.50% [12],[18],[19],[21]   7.50% [12],[18],[19],[21]   7.25% [10],[17],[22],[24]
PIK Rate [12],[13],[18] 0.50%   0.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 11,859    
Ending balance [3],[12],[18],[21] $ 11,809   $ 11,809    
Investment, Identifier [Axis]: Obra Capital, Inc. | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 11.25% [12],[18],[21]   11.25% [12],[18],[21]   11.09% [10],[17],[24]
Spread 7.50% [12],[18],[19],[21]   7.50% [12],[18],[19],[21]   7.25% [10],[17],[22],[24]
PIK Rate [12],[13],[18] 0.50%   0.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 1,349    
Ending balance [3],[12],[18],[21] $ 1,343   $ 1,343    
Investment, Identifier [Axis]: OnPoint Industrial Services, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.73% [12],[18],[21]   9.73% [12],[18],[21]   9.42% [10],[17],[24]
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   5.75% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 1,039    
Ending balance [3],[12],[18],[21] $ 1,011   $ 1,011    
Investment, Identifier [Axis]: OnPoint Industrial Services, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.73% [12],[18],[21]   9.73% [12],[18],[21]   9.42% [10],[17],[24]
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   5.75% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 2,888    
Ending balance [3],[12],[18],[21] $ 2,810   2,810    
Investment, Identifier [Axis]: Oneliance, LLC | Preferred Stock          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 130  
Amount of Interest, Fees or Dividends Credited to Income     24 13  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     810 [1],[7],[25] 640  
Gross Additions     0 130  
Gross Reductions     0 0  
Ending balance 810 [3],[8],[26] 770 810 [3],[8],[26] 770  
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)     (770) 0  
Amount of Interest, Fees or Dividends Credited to Income     30 30  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,360 [1],[7],[33] 3,360  
Gross Additions     0 0  
Gross Reductions     770 0  
Ending balance $ 2,590 [3],[8],[34] $ 3,360 $ 2,590 [3],[8],[34] $ 3,360  
Investment, Identifier [Axis]: Orttech Holdings, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [7],[24]         14.98%
Spread 11.00% [8],[19],[20],[21] 11.00% 11.00% [8],[19],[20],[21] 11.00% 11.00% [7],[22],[24]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (3) 0  
Amount of Interest, Fees or Dividends Credited to Income     7 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     153 [1],[7],[24] 0  
Gross Additions     3 0  
Gross Reductions     156 0  
Ending balance $ 0 [3],[8],[20],[21] $ 0 $ 0 [3],[8],[20],[21] $ 0  
Investment, Identifier [Axis]: Orttech Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 14.72% [8],[21] 15.48% 14.72% [8],[21] 15.48% 14.98% [7],[24]
Spread 11.00% [8],[19],[21] 11.00% 11.00% [8],[19],[21] 11.00% 11.00% [7],[22],[24]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (11) (12)  
Amount of Interest, Fees or Dividends Credited to Income     396 431  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     5,190 [1],[7],[24] 5,490  
Gross Additions     11 12  
Gross Reductions     11 212  
Ending balance $ 5,190 [3],[8],[21] $ 5,290 5,190 [3],[8],[21] 5,290  
Investment, Identifier [Axis]: Other Amounts related to investments transferred to or from other 1940 Act classification during the period | 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 0 0  
Investment, Identifier [Axis]: Other Amounts related to investments transferred to or from other 1940 Act classification during the period | Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 4,301  
Amount of Unrealized Gain/(Loss)     0 (3,611)  
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 (7,914)  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 0 $ 0 0  
Investment, Identifier [Axis]: Paragon Healthcare, Inc., Secured Debt 2          
Schedule of Investments [Line Items]          
Spread         11.80%
Investment, Identifier [Axis]: PavCon LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [12],[18],[19],[20],[21] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[20],[21] $ (45)   $ (45)    
Investment, Identifier [Axis]: PavCon LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Spread [12],[18],[19],[20],[21] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[20],[21] $ (45)   $ (45)    
Investment, Identifier [Axis]: PavCon LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21] 9.49%   9.49%    
Spread [12],[18],[19],[21] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[21] $ 17,282   $ 17,282    
Investment, Identifier [Axis]: Peaches Holding Corporation | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     0    
Ending balance [3],[12] 0   0    
Investment, Identifier [Axis]: Pinnacle TopCo, LLC | Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 300  
Amount of Interest, Fees or Dividends Credited to Income     98 255  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     5,110 [1],[7],[25] 4,590  
Gross Additions     0 300  
Gross Reductions     0 0  
Ending balance 5,110 [3],[8],[26] 4,890 5,110 [3],[8],[26] 4,890  
Investment, Identifier [Axis]: Pinnacle TopCo, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (1) (1)  
Amount of Interest, Fees or Dividends Credited to Income     2 2  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7],[23] 0  
Gross Additions     1 1  
Gross Reductions     1 1  
Ending balance $ 0 [3],[8],[20] $ 0 $ 0 [3],[8],[20] $ 0  
Investment, Identifier [Axis]: Pinnacle TopCo, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.00% [8] 13.00% 13.00% [8] 13.00% 13.00% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (21) (21)  
Amount of Interest, Fees or Dividends Credited to Income     453 486  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     6,800 [1],[7] 7,160  
Gross Additions     21 21  
Gross Reductions     301 221  
Ending balance $ 6,520 [3],[8] $ 6,960 $ 6,520 [3],[8] 6,960  
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.16% [12],[18],[21],[38]   9.16% [12],[18],[21],[38]   9.35% [10],[17],[24],[36]
Spread 5.50% [12],[18],[19],[21],[38]   5.50% [12],[18],[19],[21],[38]   5.50% [10],[17],[22],[24],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36]     $ 5,850    
Ending balance [3],[12],[18],[21],[38] $ 5,820   $ 5,820    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.23% [12],[18],[21],[38]   9.23% [12],[18],[21],[38]   9.17% [10],[17],[24],[36]
Spread 5.50% [12],[18],[19],[21],[38]   5.50% [12],[18],[19],[21],[38]   5.50% [10],[17],[22],[24],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36]     $ 559    
Ending balance [3],[12],[18],[21],[38] $ 556   $ 556    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.23% [12],[18],[21],[38]   9.23% [12],[18],[21],[38]   9.17% [10],[17],[24],[36]
Spread 5.50% [12],[18],[19],[21],[38]   5.50% [12],[18],[19],[21],[38]   5.50% [10],[17],[22],[24],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36]     $ 561    
Ending balance [3],[12],[18],[21],[38] $ 559   $ 559    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 8.98% [12],[18],[21],[38]   8.98% [12],[18],[21],[38]   8.92% [10],[17],[24],[36]
Spread 5.25% [12],[18],[19],[21],[38]   5.25% [12],[18],[19],[21],[38]   5.25% [10],[17],[22],[24],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36]     $ 638    
Ending balance [3],[12],[18],[21],[38] $ 635   $ 635    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate 8.92% [12],[18],[21],[38]   8.92% [12],[18],[21],[38]   9.12% [10],[17],[24],[36]
Spread 5.25% [12],[18],[19],[21],[38]   5.25% [12],[18],[19],[21],[38]   5.25% [10],[17],[22],[24],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36]     $ 1,414    
Ending balance [3],[12],[18],[21],[38] $ 1,407   $ 1,407    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 6          
Schedule of Investments [Line Items]          
Total Rate 8.91% [12],[18],[21],[38]   8.91% [12],[18],[21],[38]   9.09% [10],[17],[24],[36]
Spread 5.25% [12],[18],[19],[21],[38]   5.25% [12],[18],[19],[21],[38]   5.25% [10],[17],[22],[24],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36]     $ 1,327    
Ending balance [3],[12],[18],[21],[38] $ 1,320   $ 1,320    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 7          
Schedule of Investments [Line Items]          
Total Rate 8.39% [12],[18],[21],[38]   8.39% [12],[18],[21],[38]   8.63% [10],[17],[24],[36]
Spread 4.75% [12],[18],[19],[21],[38]   4.75% [12],[18],[19],[21],[38]   4.75% [10],[17],[22],[24],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[36]     $ 1,073    
Ending balance [3],[12],[18],[21],[38] $ 1,078   $ 1,078    
Investment, Identifier [Axis]: PrimeFlight Aviation Services | Secured Debt 8          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21],[38] 8.41%   8.41%    
Spread [12],[18],[19],[21],[38] 4.75%   4.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[21],[38] $ 5,875   $ 5,875    
Investment, Identifier [Axis]: Pro-Max Restoration & Paint, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18] $ 952   $ 952    
Investment, Identifier [Axis]: Pro-Max Restoration & Paint, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [12],[18],[19],[20],[21] 5.75%   5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[20],[21] $ (28)   $ (28)    
Investment, Identifier [Axis]: Pro-Max Restoration & Paint, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21] 9.42%   9.42%    
Spread [12],[18],[19],[21] 5.75%   5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[21] $ 15,993   $ 15,993    
Investment, Identifier [Axis]: RA Outdoors LLC | Common Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7],[17] 0  
Gross Additions       0  
Gross Reductions       0  
Ending balance $ 0 [3],[8],[18] $ 0 $ 0 [3],[8],[18] $ 0  
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.58% [8],[18],[21] 11.25% 10.58% [8],[18],[21] 11.25% 10.89% [7],[17],[24]
Spread 6.75% [8],[18],[19],[21] 6.75% 6.75% [8],[18],[19],[21] 6.75% 6.75% [7],[17],[22],[24]
PIK Rate 10.58% [8],[13],[18],[21] 11.25% 10.58% [8],[13],[18],[21] 11.25% 10.89% [7],[14],[17],[24]
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       (143)  
Amount of Interest, Fees or Dividends Credited to Income       76  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 1,142 [1],[7],[17],[24] 1,215  
Gross Additions       40  
Gross Reductions       145  
Ending balance $ 1,216 [3],[8],[18],[21] $ 1,110 $ 1,216 [3],[8],[18],[21] $ 1,110  
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 1.1          
Schedule of Investments [Line Items]          
Total Rate 10.58%   10.58%    
Spread 6.75%   6.75%    
PIK Rate 10.58%   10.58%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     72    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,142    
Gross Additions     74    
Gross Reductions     0    
Ending balance $ 1,216   $ 1,216    
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.58% [8],[18],[21] 11.25% 10.58% [8],[18],[21] 11.25%  
Spread 6.75% [8],[18],[19],[21] 6.75% 6.75% [8],[18],[19],[21] 6.75% 6.75% [7],[17],[22],[23],[24]
PIK Rate 10.58% [8],[13],[18],[21] 11.25% 10.58% [8],[13],[18],[21] 11.25%  
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       (1,500)  
Amount of Interest, Fees or Dividends Credited to Income       796  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 0 [1],[7],[17],[23],[24] 12,710  
Gross Additions       410  
Gross Reductions       1,515  
Ending balance $ 385 [3],[8],[18],[21] $ 11,605 $ 385 [3],[8],[18],[21] $ 11,605  
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 2.1          
Schedule of Investments [Line Items]          
Total Rate 10.58%   10.58%    
Spread 6.75%   6.75%    
PIK Rate 10.58%   10.58%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     (2)    
Amount of Interest, Fees or Dividends Credited to Income     779    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     11,937    
Gross Additions     780    
Gross Reductions     2    
Ending balance $ 12,715   $ 12,715    
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.58% [8],[18],[21] 11.25% 10.58% [8],[18],[21] 11.25% 10.89% [7],[17],[24]
Spread 6.75% [8],[18],[19],[21] 6.75% 6.75% [8],[18],[19],[21] 6.75% 6.75% [7],[17],[22],[24]
PIK Rate 10.58% [8],[13],[18],[21] 11.25% 10.58% [8],[13],[18],[21] 11.25% 10.89% [7],[14],[17],[24]
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     $ 11,937 [1],[7],[17],[24] 0  
Gross Additions       1  
Gross Reductions       0  
Ending balance $ 376 [3],[8],[18],[21] $ 1 $ 376 [3],[8],[18],[21] 1  
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 3.1          
Schedule of Investments [Line Items]          
Total Rate 10.58%   10.58%    
Spread 6.75%   6.75%    
PIK Rate 10.58%   10.58%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     (77)    
Amount of Interest, Fees or Dividends Credited to Income     14    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     462    
Gross Reductions     77    
Ending balance $ 385   $ 385    
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [8],[18],[21] 10.58%   10.58%    
Spread 6.75% [8],[18],[19],[21]   6.75% [8],[18],[19],[21]   6.75% [7],[17],[22],[23],[24]
PIK Rate [8],[13],[18],[21] 10.58%   10.58%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7],[17],[23],[24]     $ 0    
Ending balance [3],[8],[18],[21] $ 12,715   $ 12,715    
Investment, Identifier [Axis]: RA Outdoors LLC | Secured Debt 4.1          
Schedule of Investments [Line Items]          
Total Rate 10.58%   10.58%    
Spread 6.75%   6.75%    
PIK Rate 10.58%   10.58%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     (75)    
Amount of Interest, Fees or Dividends Credited to Income     13    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     451    
Gross Reductions     75    
Ending balance $ 376   $ 376    
Investment, Identifier [Axis]: Richardson Sales Solutions | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[24],[28]         8.86%
Spread 5.00% [12],[18],[19],[20],[21],[27]   5.00% [12],[18],[19],[20],[21],[27]   5.00% [10],[17],[22],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[28]     $ 340    
Ending balance [3],[12],[18],[20],[21],[27] $ 0   $ 0    
Investment, Identifier [Axis]: Richardson Sales Solutions | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 8.67% [12],[18],[21]   8.67% [12],[18],[21]   8.86% [10],[17],[24]
Spread 5.00% [12],[18],[19],[21]   5.00% [12],[18],[19],[21]   5.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 10,023    
Ending balance [3],[12],[18],[21] $ 9,611   $ 9,611    
Investment, Identifier [Axis]: Richardson Sales Solutions | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 8.67% [12],[18],[21]   8.67% [12],[18],[21]   8.93% [10],[17],[24]
Spread 5.00% [12],[18],[19],[21]   5.00% [12],[18],[19],[21]   5.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 4,938    
Ending balance [3],[12],[18],[21] $ 4,736   4,736    
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 [1],[7] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 0 [3],[8] $ 0 0 [3],[8] $ 0  
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
PIK Rate   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 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     (12) [1],[7],[15],[23] (7)  
Gross Additions     0 0  
Gross Reductions     2 1  
Ending balance $ (14) [3],[8],[16],[20] $ (8) $ (14) [3],[8],[16],[20] $ (8)  
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.50% [8],[16] 12.50% 12.50% [8],[16] 12.50% 12.50% [7],[15]
PIK Rate 10.00% [8],[13],[16] 10.00% 10.00% [8],[13],[16] 10.00% 10.00% [7],[14],[15]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     35 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     1,559 [1],[7],[15] 1,617  
Gross Additions     0 0  
Gross Reductions     21 38  
Ending balance $ 1,538 [3],[8],[16] $ 1,579 1,538 [3],[8],[16] 1,579  
Investment, Identifier [Axis]: Roof Opco, LLC | Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23]     0    
Ending balance [3],[12],[18],[20] $ 0   $ 0    
Investment, Identifier [Axis]: Roof Opco, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.00% [12],[18]   10.00% [12],[18]   10.00% [10],[17]
PIK Rate 10.00% [12],[13],[18]   10.00% [12],[13],[18]   10.00% [10],[14],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     $ 3,056    
Ending balance [3],[12],[18] $ 3,545   $ 3,545    
Investment, Identifier [Axis]: Roof Opco, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.00% [12],[18]   10.00% [12],[18]   10.00% [10],[17]
PIK Rate 10.00% [12],[13],[18]   10.00% [12],[13],[18]   10.00% [10],[14],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     $ 2,970    
Ending balance [3],[12],[18] $ 3,439   3,439    
Investment, Identifier [Axis]: Royal Cup Inc. | Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     857    
Ending balance [3],[12],[18] $ 1,349   1,349    
Investment, Identifier [Axis]: Royal Cup Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread [10],[17],[22],[23],[24]         5.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     (51)    
Investment, Identifier [Axis]: Royal Cup Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Spread [10],[17],[22],[23],[24]         5.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     (19)    
Investment, Identifier [Axis]: Royal Cup Inc. | Secured Debt 3          
Schedule of Investments [Line Items]          
Spread [10],[17],[22],[23],[24]         5.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     (82)    
Investment, Identifier [Axis]: Royal Cup Inc. | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[24]         8.98%
Spread [10],[17],[22],[24]         5.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 11,826    
Investment, Identifier [Axis]: Rug Doctor, LLC. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.23% [12],[18],[21]   9.23% [12],[18],[21]   9.17% [10],[17],[24]
Spread 5.50% [12],[18],[19],[21]   5.50% [12],[18],[19],[21]   5.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 4,134    
Ending balance [3],[12],[18],[21] $ 3,134   $ 3,134    
Investment, Identifier [Axis]: Rug Doctor, LLC. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.23% [12],[18],[21]   9.23% [12],[18],[21]   9.17% [10],[17],[24]
Spread 5.50% [12],[18],[19],[21]   5.50% [12],[18],[19],[21]   5.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 7,590    
Ending balance [3],[12],[18],[21] $ 7,358   7,358    
Investment, Identifier [Axis]: SI East, LLC | Preferred Member Units          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     (220) (400)  
Amount of Interest, Fees or Dividends Credited to Income     93 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     5,730 [1],[7],[25] 4,550  
Gross Additions     0 0  
Gross Reductions     220 400  
Ending balance $ 5,510 [3],[8],[26] $ 4,150 $ 5,510 [3],[8],[26] $ 4,150  
Investment, Identifier [Axis]: SI East, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.80% [8] 11.85% 11.80% [8] 11.85% 11.80% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (1) (1)  
Amount of Interest, Fees or Dividends Credited to Income     49 49  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     750 [1],[7] 750  
Gross Additions     1 1  
Gross Reductions     1 1  
Ending balance $ 750 [3],[8] $ 750 $ 750 [3],[8] $ 750  
Investment, Identifier [Axis]: SI East, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.84% [8],[52] 12.79% 12.84% [8],[52] 12.79% 12.85% [7],[53]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (6) 15  
Amount of Interest, Fees or Dividends Credited to Income     1,444 1,457  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     22,283 [1],[7],[53] 22,554  
Gross Additions     6 0  
Gross Reductions     6 0  
Ending balance $ 22,283 [3],[8],[52] $ 22,554 22,283 [3],[8],[52] 22,554  
Investment, Identifier [Axis]: SPAU Holdings, LLC | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     200    
Ending balance [3],[12],[18] $ 200   $ 200    
Investment, Identifier [Axis]: SPAU Holdings, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21],[27] 10.86%   10.86%    
Spread 7.00% [12],[18],[19],[21],[27]   7.00% [12],[18],[19],[21],[27]   7.00% [10],[17],[22],[23],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24],[28]     $ 0    
Ending balance [3],[12],[18],[21],[27] $ 660   $ 660    
Investment, Identifier [Axis]: SPAU Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.88% [12],[18],[21]   10.88% [12],[18],[21]   10.82% [10],[17],[24]
Spread 7.00% [12],[18],[19],[21]   7.00% [12],[18],[19],[21]   7.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 4,825    
Ending balance [3],[12],[18],[21] $ 4,800   4,800    
Investment, Identifier [Axis]: Slick Innovations, LLC | Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[25]     560    
Ending balance [3],[12] $ 750   $ 750    
Investment, Identifier [Axis]: Slick Innovations, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 14.00% [12]   14.00% [12]   14.00% [10]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 6,170    
Ending balance [3],[12] $ 5,690   5,690    
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     71    
Ending balance [3],[12],[18] $ 83   $ 83    
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.00% [12],[18],[19],[20],[21]   5.00% [12],[18],[19],[20],[21]   5.25% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ 0    
Ending balance [3],[12],[18],[20],[21] $ 0   $ 0    
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 8.74% [12],[18],[21]   8.74% [12],[18],[21]   9.07% [10],[17],[24]
Spread 5.00% [12],[18],[19],[21]   5.00% [12],[18],[19],[21]   5.25% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 33,214    
Ending balance [3],[12],[18],[21] $ 32,113   $ 32,113    
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 8.74% [12],[18],[21]   8.74% [12],[18],[21]   9.07% [10],[17],[24]
Spread 5.00% [12],[18],[19],[21]   5.00% [12],[18],[19],[21]   5.25% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 6,525    
Ending balance [3],[12],[18],[21] $ 6,492   6,492    
Investment, Identifier [Axis]: Student Resource Center, LLC | Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7],[17] 0  
Gross Additions       0  
Gross Reductions       0  
Ending balance $ 0 [3],[8],[18] $ 0 $ 0 [3],[8],[18] $ 0  
Investment, Identifier [Axis]: Student Resource Center, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 8.50% [8],[18] 8.50% 8.50% [8],[18] 8.50% 8.50% [7],[17]
PIK Rate 8.50% [8],[13],[18] 8.50% 8.50% [8],[13],[18] 8.50% 8.50% [7],[14],[17]
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       (647)  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 866 [1],[7],[17] 1,826  
Gross Additions       0  
Gross Reductions       647  
Ending balance $ 955 [3],[8],[18] $ 1,179 $ 955 [3],[8],[18] $ 1,179  
Investment, Identifier [Axis]: Student Resource Center, LLC | Secured Debt 1.1          
Schedule of Investments [Line Items]          
Total Rate 8.50%   8.50%    
PIK Rate 8.50%   8.50%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     299    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,598    
Gross Additions     299    
Gross Reductions     0    
Ending balance $ 1,897   $ 1,897    
Investment, Identifier [Axis]: Student Resource Center, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 8.50% [8],[16],[18] 8.50% 8.50% [8],[16],[18] 8.50% 8.50% [7],[15],[17]
PIK Rate 8.50% [8],[13],[16],[18] 8.50% 8.50% [8],[13],[16],[18] 8.50% 8.50% [7],[14],[15],[17]
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       748  
Amount of Interest, Fees or Dividends Credited to Income       9  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 1,598 [1],[7],[15],[17] 227  
Gross Additions       758  
Gross Reductions       0  
Ending balance $ 1,897 [3],[8],[16],[18] $ 985 $ 1,897 [3],[8],[16],[18] 985  
Investment, Identifier [Axis]: Student Resource Center, LLC | Secured Debt 2.1          
Schedule of Investments [Line Items]          
Total Rate 8.50%   8.50%    
PIK Rate 8.50%   8.50%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     80    
Amount of Interest, Fees or Dividends Credited to Income     9    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     866    
Gross Additions     89    
Gross Reductions     0    
Ending balance $ 955   $ 955    
Investment, Identifier [Axis]: TEC Services, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 5.50% [12],[18],[19],[20],[21]   5.50% [12],[18],[19],[20],[21]   5.50% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (6)    
Ending balance [3],[12],[18],[20],[21] $ (5)   $ (5)    
Investment, Identifier [Axis]: TEC Services, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Spread 5.50% [12],[18],[19],[20],[21]   5.50% [12],[18],[19],[20],[21]   5.50% [10],[17],[22],[23],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[23],[24]     $ (4)    
Ending balance [3],[12],[18],[20],[21] $ (4)   $ (4)    
Investment, Identifier [Axis]: TEC Services, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.33% [12],[18],[21]   9.33% [12],[18],[21]   9.27% [10],[17],[24]
Spread 5.50% [12],[18],[19],[21]   5.50% [12],[18],[19],[21]   5.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 2,302    
Ending balance [3],[12],[18],[21] $ 2,298   2,298    
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 [1],[7] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 0 [3],[8] 0 0 [3],[8] 0  
Investment, Identifier [Axis]: Tedder Industries, LLC | Preferred Member Units 2          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance 0 [3],[8] 0 0 [3],[8] 0  
Investment, Identifier [Axis]: Tedder Industries, LLC | Preferred Member Units 3          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 [3],[8] $ 0 $ 0 [3],[8] $ 0  
Investment, Identifier [Axis]: Tedder Industries, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 12.00% [8],[35] 12.00% 12.00% [8],[35] 12.00% 12.00% [7],[15],[44]
PIK Rate 12.00% [8],[13],[35] 12.00% 12.00% [8],[13],[35] 12.00% 12.00% [7],[14],[15],[44]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (21) (1)  
Amount of Interest, Fees or Dividends Credited to Income     119 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     241 [1],[7],[15],[44] 412  
Gross Additions     119 0  
Gross Reductions     21 1  
Ending balance $ 339 [3],[8],[35] $ 411 $ 339 [3],[8],[35] $ 411  
Investment, Identifier [Axis]: Tedder Industries, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 12.00% [8],[16],[35] 12.00% 12.00% [8],[16],[35] 12.00% 12.00% [7],[15],[44]
PIK Rate 12.00% [8],[13],[16],[35] 12.00% 12.00% [8],[13],[16],[35] 12.00% 12.00% [7],[14],[15],[44]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     750 (38)  
Amount of Interest, Fees or Dividends Credited to Income     0 0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     707 [1],[7],[15],[44] 901  
Gross Additions     750 0  
Gross Reductions     0 38  
Ending balance $ 1,457 [3],[8],[16],[35] $ 863 1,457 [3],[8],[16],[35] 863  
Investment, Identifier [Axis]: Tex Tech Tennis, LLC | Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[33]     2,900    
Ending balance [3],[12],[18],[26],[34] 3,100   3,100    
Investment, Identifier [Axis]: The Affiliati Network, LLC | Preferred Stock 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     78    
Ending balance [3],[12] 78   78    
Investment, Identifier [Axis]: The Affiliati Network, LLC | Preferred Stock 2          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[25]     1,600    
Ending balance [3],[12],[26] $ 1,600   $ 1,600    
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Preferred Equity          
Schedule of Investments [Line Items]          
Total Rate 8.00% [12],[18]   8.00% [12],[18]   8.00% [10],[17]
PIK Rate 8.00% [12],[13],[18]   8.00% [12],[13],[18]   8.00% [10],[14],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     $ 590    
Ending balance [3],[12],[18] $ 710   $ 710    
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.23% [12],[18],[21]   10.23% [12],[18],[21]   10.17% [10],[17],[24]
Spread 6.50% [12],[18],[19],[21]   6.50% [12],[18],[19],[21]   6.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 554    
Ending balance [3],[12],[18],[21] $ 1,370   $ 1,370    
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.23% [12],[18],[21]   10.23% [12],[18],[21]   10.17% [10],[17],[24]
Spread 6.50% [12],[18],[19],[21]   6.50% [12],[18],[19],[21]   6.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 12,917    
Ending balance [3],[12],[18],[21] $ 12,852   $ 12,852    
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.23% [12],[18],[21]   10.23% [12],[18],[21]   10.17% [10],[17],[24]
Spread 6.50% [12],[18],[19],[21]   6.50% [12],[18],[19],[21]   6.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 1,653    
Ending balance [3],[12],[18],[21] $ 1,645   $ 1,645    
Investment, Identifier [Axis]: Titan Meter Midco Corp. | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 10.23% [12],[18],[21]   10.23% [12],[18],[21]   10.17% [10],[17],[24]
Spread 6.50% [12],[18],[19],[21]   6.50% [12],[18],[19],[21]   6.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 1,870    
Ending balance [3],[12],[18],[21] $ 1,861   1,861    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Common Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7],[33]     174    
Gross Additions     0    
Gross Reductions     0    
Ending balance [3],[8],[34] 174   174    
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)     2,789 230  
Amount of Interest, Fees or Dividends Credited to Income     0 15  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,730 [1],[7],[25] 2,140  
Gross Additions     3,130 230  
Gross Reductions     0 0  
Ending balance $ 6,860 [3],[8],[26] 2,370 $ 6,860 [3],[8],[26] 2,370  
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [8] 11.50%   11.50%    
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       1  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 0 [1],[7],[23] (1)  
Gross Additions       1  
Gross Reductions       0  
Ending balance $ 400 [3],[8] $ 0 $ 400 [3],[8] $ 0  
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 1.1          
Schedule of Investments [Line Items]          
Total Rate 11.50%   11.50%    
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     0    
Gross Additions     400    
Gross Reductions     0    
Ending balance $ 400   $ 400    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.50% [8] 13.50% 13.50% [8] 13.50% 13.50% [7]
Amount of Realized Gain/(Loss)       $ 0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       138  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 2,250 [1],[7] 1,962  
Gross Additions       3  
Gross Reductions       0  
Ending balance $ 7,820 [3],[8] $ 1,965 $ 7,820 [3],[8] $ 1,965  
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 2.1          
Schedule of Investments [Line Items]          
Total Rate 13.50%   13.50%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     (18)    
Amount of Interest, Fees or Dividends Credited to Income     69    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,250    
Gross Additions     0    
Gross Reductions     2,250    
Ending balance $ 0   $ 0    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.00% [8]   9.00% [8]   9.00% [7]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[7]     $ 510    
Ending balance [3],[8] $ 510   $ 510    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 3.1          
Schedule of Investments [Line Items]          
Total Rate 13.50%   13.50%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     156    
Amount of Interest, Fees or Dividends Credited to Income     318    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     7,820    
Gross Reductions     0    
Ending balance $ 7,820   $ 7,820    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [8] 9.00%   9.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[8] $ 525   $ 525    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 4.1          
Schedule of Investments [Line Items]          
Total Rate 9.00%   9.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     (1)    
Amount of Interest, Fees or Dividends Credited to Income     24    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     510    
Gross Additions     1    
Gross Reductions     1    
Ending balance $ 510   $ 510    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate [8] 9.00%   9.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[8] $ 100   $ 100    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 5.1          
Schedule of Investments [Line Items]          
Total Rate 9.00%   9.00%    
Amount of Realized Gain/(Loss)     $ 0    
Amount of Unrealized Gain/(Loss)     2    
Amount of Interest, Fees or Dividends Credited to Income     13    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     525    
Gross Reductions     0    
Ending balance $ 525   $ 525    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC | Secured Debt 6.1          
Schedule of Investments [Line Items]          
Total Rate 9.00%   9.00%    
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     100    
Gross Reductions     0    
Ending balance $ 100   $ 100    
Investment, Identifier [Axis]: U.S. TelePacific Corp. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 14.70% [11],[12],[21],[35]   14.70% [11],[12],[21],[35]   12.32% [9],[10],[15],[24]
Spread 11.00% [11],[12],[19],[21],[35]   11.00% [11],[12],[19],[21],[35]   8.15% [9],[10],[15],[22],[24]
PIK Rate 10.00% [11],[12],[13],[21],[35]   10.00% [11],[12],[13],[21],[35]   7.00% [9],[10],[14],[15],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[15],[24]     $ 2,747    
Ending balance [3],[11],[12],[21],[35] $ 468   $ 468    
Investment, Identifier [Axis]: U.S. TelePacific Corp. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [11],[12],[16],[21] 13.75%   13.75%    
Spread [11],[12],[16],[19],[21] 7.00%   7.00%    
PIK Rate [11],[12],[13],[16],[21] 7.00%   7.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[15]     $ 0    
Ending balance [3],[11],[12],[16],[21] $ 1,333   1,333    
Investment, Identifier [Axis]: U.S. TelePacific Corp. | Secured Debt 3          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[11],[12],[16] 0   0    
Investment, Identifier [Axis]: UBM AcquireCo LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     2,000    
Ending balance [3],[12],[26] 1,970   1,970    
Investment, Identifier [Axis]: UBM AcquireCo LLC | Secured Debt 1          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[23]     (10)    
Ending balance [3],[12],[20] $ (18)   $ (18)    
Investment, Identifier [Axis]: UBM AcquireCo LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.00% [12]   10.00% [12]   10.00% [10]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 10,595    
Ending balance [3],[12] $ 3,808   $ 3,808    
Investment, Identifier [Axis]: UBM AcquireCo LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12] 10.00%   10.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12] $ 10,461   $ 10,461    
Investment, Identifier [Axis]: UPS Intermediate, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     420    
Ending balance [3],[12],[18] $ 460   $ 460    
Investment, Identifier [Axis]: UPS Intermediate, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 10.23% [12],[18],[21]   10.23% [12],[18],[21]   9.97% [10],[17],[24]
Spread 6.50% [12],[18],[19],[21]   6.50% [12],[18],[19],[21]   6.25% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 19,168    
Ending balance [3],[12],[18],[21] $ 19,196   19,196    
Investment, Identifier [Axis]: Urgent DSO LLC | Preferred Equity          
Schedule of Investments [Line Items]          
Total Rate   9.00%   9.00%  
PIK Rate   9.00%   9.00%  
Amount of Realized Gain/(Loss)     0 $ 0  
Amount of Unrealized Gain/(Loss)     (896) 0  
Amount of Interest, Fees or Dividends Credited to Income     0 49  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,089 [1],[7],[25] 1,080  
Gross Additions     0 49  
Gross Reductions     896 0  
Ending balance $ 193 [3],[8],[26] $ 1,129 $ 193 [3],[8],[26] $ 1,129  
Investment, Identifier [Axis]: Urgent DSO LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 13.50% [8] 13.50% 13.50% [8] 13.50% 13.50% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     (50) 0  
Amount of Interest, Fees or Dividends Credited to Income     156 156  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     2,168 [1],[7] 2,145  
Gross Additions     7 7  
Gross Reductions     50 0  
Ending balance $ 2,125 [3],[8] $ 2,152 2,125 [3],[8] 2,152  
Investment, Identifier [Axis]: UserZoom Technologies, Inc. | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[24]         11.63%
Spread [10],[17],[22],[24]         7.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 3,000    
Investment, Identifier [Axis]: UserZoom Technologies, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21] 11.42%   11.42%    
Spread [12],[18],[19],[21] 7.75%   7.75%    
PIK Rate [12],[13],[18],[21] 1.75%   1.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[21] $ 208   $ 208    
Investment, Identifier [Axis]: UserZoom Technologies, Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21] 11.40%   11.40%    
Spread [12],[18],[19],[21] 7.75%   7.75%    
PIK Rate [12],[13],[18],[21] 1.75%   1.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[21] $ 2,579   $ 2,579    
Investment, Identifier [Axis]: VORTEQ Coil Finishers, LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[25]     2,670    
Ending balance [3],[12],[18],[26] 2,980   2,980    
Investment, Identifier [Axis]: VVS Holdco LLC | Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     0 25  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,060 [1],[7],[25],[33] 3,060  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 3,060 [3],[8],[34] $ 3,060 $ 3,060 [3],[8],[34] $ 3,060  
Investment, Identifier [Axis]: VVS Holdco LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Spread 6.00% [8],[19],[20],[21] 6.00% 6.00% [8],[19],[20],[21] 6.00% 6.00% [7],[22],[23],[24]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     2 2  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[7],[23],[24] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 [3],[8],[20],[21] $ 0 $ 0 [3],[8],[20],[21] $ 0  
Investment, Identifier [Axis]: VVS Holdco LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.50% [8] 11.50% 11.50% [8] 11.50% 11.50% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     359 387  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     5,967 [1],[7] 6,366  
Gross Additions     19 22  
Gross Reductions     300 320  
Ending balance $ 5,686 [3],[8] $ 6,068 5,686 [3],[8] 6,068  
Investment, Identifier [Axis]: Victory Energy Operations, LLC | Preferred Equity          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0 0  
Amount of Unrealized Gain/(Loss)     290 0  
Amount of Interest, Fees or Dividends Credited to Income     35 37  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     3,760 [1],[7] 3,644  
Gross Additions     290 0  
Gross Reductions     0 35  
Ending balance $ 4,050 [3],[8] $ 3,609 $ 4,050 [3],[8] $ 3,609  
Investment, Identifier [Axis]: Victory Energy Operations, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 13.00% [8] 13.00% 13.00% [8] 13.00% 13.00% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     19 6  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     127 [1],[7] (5)  
Gross Additions     276 272  
Gross Reductions     70 0  
Ending balance $ 333 [3],[8] $ 267 $ 333 [3],[8] $ 267  
Investment, Identifier [Axis]: Victory Energy Operations, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 13.00% [8] 13.00% 13.00% [8] 13.00% 13.00% [7]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     530 530  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     7,575 [1],[7] 7,529  
Gross Additions     23 23  
Gross Reductions     0 0  
Ending balance $ 7,598 [3],[8] $ 7,552 $ 7,598 [3],[8] 7,552  
Investment, Identifier [Axis]: Vitesse Systems | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 10.99% [12],[18],[27]   10.99% [12],[18],[27]   10.98% [10],[17],[28]
Spread 7.00% [12],[18],[19],[27]   7.00% [12],[18],[19],[27]   7.00% [10],[17],[22],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[28]     $ 2,273    
Ending balance [3],[12],[18],[27] $ 2,273   $ 2,273    
Investment, Identifier [Axis]: Vitesse Systems | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 10.99% [12],[18],[21]   10.99% [12],[18],[21]   10.93% [10],[17],[24]
Spread 7.00% [12],[18],[19],[21]   7.00% [12],[18],[19],[21]   7.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 12,250    
Ending balance [3],[12],[18],[21] $ 1,052   $ 1,052    
Investment, Identifier [Axis]: Vitesse Systems | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21] 10.99%   10.99%    
Spread [12],[18],[19],[21] 7.00%   7.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[21] $ 12,187   $ 12,187    
Investment, Identifier [Axis]: Vitesse Systems, Secured Debt 1, Secured Overnight Financing Rate          
Schedule of Investments [Line Items]          
Spread 4.00%   4.00%   4.00%
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 [1],[5] 0  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 0 [3],[6] 0 0 [3],[6] 0  
Investment, Identifier [Axis]: Volusion, LLC | Preferred Member Units 1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,249 [1],[5] 0  
Gross Additions       0  
Gross Reductions       0  
Ending balance 743 [3],[6] 0 743 [3],[6] 0  
Investment, Identifier [Axis]: Volusion, LLC | Preferred Member Units 1.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     0    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions     0    
Gross Reductions     0    
Ending balance 0   0    
Investment, Identifier [Axis]: Volusion, LLC | Preferred Member Units 2          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       10  
Amount of Unrealized Gain/(Loss)       (694)  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[5] 3,004  
Gross Additions       9  
Gross Reductions       1,173  
Ending balance 0 [3],[6] 1,840 0 [3],[6] 1,840  
Investment, Identifier [Axis]: Volusion, LLC | Preferred Member Units 2.1          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)     0    
Amount of Unrealized Gain/(Loss)     (249)    
Amount of Interest, Fees or Dividends Credited to Income     0    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,249    
Gross Additions     0    
Gross Reductions     506    
Ending balance 743   743    
Investment, Identifier [Axis]: Volusion, LLC | Preferred Member Units 3          
Schedule of Investments [Line Items]          
Amount of Realized Gain/(Loss)       0  
Amount of Unrealized Gain/(Loss)       0  
Amount of Interest, Fees or Dividends Credited to Income       0  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [1],[5] 0  
Gross Additions       0  
Gross Reductions       0  
Ending balance $ 0 [3],[6] $ 0 $ 0 [3],[6] $ 0  
Investment, Identifier [Axis]: Volusion, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 10.00% [6],[35] 10.00% 10.00% [6],[35] 10.00% 10.00% [5],[44]
Amount of Realized Gain/(Loss)     $ 0 $ 0  
Amount of Unrealized Gain/(Loss)     0 0  
Amount of Interest, Fees or Dividends Credited to Income     45 45  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     900 [1],[5],[44] 900  
Gross Additions     0 0  
Gross Reductions     0 0  
Ending balance $ 900 [3],[6],[35] $ 900 900 [3],[6],[35] $ 900  
Investment, Identifier [Axis]: Wash & Wax Systems LLC | Common Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     210    
Ending balance [3],[12],[18] $ 40   $ 40    
Investment, Identifier [Axis]: Wash & Wax Systems LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.20% [12],[18],[21]   9.20% [12],[18],[21]   9.28% [10],[17],[24]
Spread 5.50% [12],[18],[19],[21]   5.50% [12],[18],[19],[21]   5.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 44    
Ending balance [3],[12],[18],[21] $ 44   $ 44    
Investment, Identifier [Axis]: Wash & Wax Systems LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.16% [12],[18],[21]   9.16% [12],[18],[21]   9.34% [10],[17],[24]
Spread 5.50% [12],[18],[19],[21]   5.50% [12],[18],[19],[21]   5.50% [10],[17],[22],[24]
PIK Rate [12],[13],[18],[21] 9.16%   9.16%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 1,029    
Ending balance [3],[12],[18],[21] $ 1,090   $ 1,090    
Investment, Identifier [Axis]: Wash & Wax Systems LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 12.00% [12],[18]   12.00% [12],[18]   12.00% [10],[17]
PIK Rate 12.00% [12],[13],[18]   12.00% [12],[13],[18]   12.00% [10],[14],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17]     $ 730    
Ending balance [3],[12],[18] $ 758   758    
Investment, Identifier [Axis]: Watterson Brands, LLC | Common Shares          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18] $ 0   $ 0    
Investment, Identifier [Axis]: Watterson Brands, LLC | Preferred Stock          
Schedule of Investments [Line Items]          
Total Rate [12],[18] 12.00%   12.00%    
PIK Rate [12],[13],[18] 12.00%   12.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18] $ 694   $ 694    
Investment, Identifier [Axis]: Watterson Brands, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10],[15],[17]         12.00%
PIK Rate [10],[14],[15],[17]         4.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[15],[17]     218    
Ending balance [3],[12],[18],[20] $ 0   $ 0    
Investment, Identifier [Axis]: Watterson Brands, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 6.00% [12],[18]   6.00% [12],[18]   12.00% [10],[15],[17]
PIK Rate 6.00% [12],[13],[18]   6.00% [12],[13],[18]   4.00% [10],[14],[15],[17]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[15],[17]     $ 37    
Ending balance [3],[12],[18] $ 1,905   1,905    
Investment, Identifier [Axis]: Watterson Brands, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate [10],[15],[17]         12.00%
PIK Rate [10],[14],[15],[17]         4.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[15],[17]     1,543    
Investment, Identifier [Axis]: Watterson Brands, LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate [10],[15],[17]         12.00%
PIK Rate [10],[14],[15],[17]         4.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[15],[17]     $ 1,392    
Investment, Identifier [Axis]: Winter Services LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate [10],[17],[24],[28]         11.49%
Spread 8.00% [12],[18],[19],[20],[21],[27]   8.00% [12],[18],[19],[20],[21],[27]   7.50% [10],[17],[22],[24],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[28]     $ 5,000    
Ending balance [3],[12],[18],[20],[21],[27] $ 0   $ 0    
Investment, Identifier [Axis]: Winter Services LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 11.95% [12],[18],[21]   11.95% [12],[18],[21]   11.75% [10],[17],[24]
Spread 8.00% [12],[18],[19],[21]   8.00% [12],[18],[19],[21]   7.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 2,343    
Ending balance [3],[12],[18],[21] $ 2,343   $ 2,343    
Investment, Identifier [Axis]: Winter Services LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 10.95% [12],[18],[21]   10.95% [12],[18],[21]   10.75% [10],[17],[24]
Spread 7.00% [12],[18],[19],[21]   7.00% [12],[18],[19],[21]   6.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 9,050    
Ending balance [3],[12],[18],[21] $ 9,050   $ 9,050    
Investment, Identifier [Axis]: Winter Services LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 12.95% [12],[18],[21]   12.95% [12],[18],[21]   12.75% [10],[17],[24]
Spread 9.00% [12],[18],[19],[21]   9.00% [12],[18],[19],[21]   8.50% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 9,050    
Ending balance [3],[12],[18],[21] $ 9,050   9,050    
Investment, Identifier [Axis]: World Micro Holdings, LLC | Preferred Equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[25]     530    
Ending balance [3],[12],[26] $ 530   $ 530    
Investment, Identifier [Axis]: World Micro Holdings, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 13.00% [12]   13.00% [12]   12.00% [10]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10]     $ 1,354    
Ending balance [3],[12] $ 1,266   $ 1,266    
Investment, Identifier [Axis]: Xenon Arc, Inc. | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 9.80% [12],[18],[21]   9.80% [12],[18],[21]   9.54% [10],[17],[24]
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   5.75% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 1,164    
Ending balance [3],[12],[18],[21] $ 1,158   $ 1,158    
Investment, Identifier [Axis]: Xenon Arc, Inc. | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.77% [12],[18],[21]   9.77% [12],[18],[21]   9.72% [10],[17],[24]
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   5.75% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 2,304    
Ending balance [3],[12],[18],[21] $ 2,292   $ 2,292    
Investment, Identifier [Axis]: Xenon Arc, Inc. | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.83% [12],[18],[21]   9.83% [12],[18],[21]   9.52% [10],[17],[24]
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   5.75% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 604    
Ending balance [3],[12],[18],[21] $ 601   $ 601    
Investment, Identifier [Axis]: YS Garments, LLC | Secured Debt          
Schedule of Investments [Line Items]          
Total Rate 11.24% [11],[12],[21]   11.24% [11],[12],[21]   11.48% [9],[10],[24]
Spread 7.50% [11],[12],[19],[21]   7.50% [11],[12],[19],[21]   7.50% [9],[10],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[9],[10],[24]     $ 4,167    
Ending balance [3],[11],[12],[21] $ 4,365   $ 4,365    
Investment, Identifier [Axis]: ZRG Partners, LLC | Secured Debt 1          
Schedule of Investments [Line Items]          
Total Rate 11.75% [12],[18],[21]   11.75% [12],[18],[21]   11.75% [10],[17],[24]
Spread 5.00% [12],[18],[19],[21]   5.00% [12],[18],[19],[21]   5.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 821    
Ending balance [3],[12],[18],[21] $ 951   $ 951    
Investment, Identifier [Axis]: ZRG Partners, LLC | Secured Debt 2          
Schedule of Investments [Line Items]          
Total Rate 9.73% [12],[18],[21],[49]   9.73% [12],[18],[21],[49]   9.69% [10],[17],[24],[50]
Spread 6.00% [12],[18],[19],[21],[49]   6.00% [12],[18],[19],[21],[49]   6.00% [10],[17],[22],[24],[50]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24],[50]     $ 1,465    
Ending balance [3],[12],[18],[21],[49] $ 1,975   $ 1,975    
Investment, Identifier [Axis]: ZRG Partners, LLC | Secured Debt 3          
Schedule of Investments [Line Items]          
Total Rate 9.85% [12],[18],[21]   9.85% [12],[18],[21]   9.60% [10],[17],[24]
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   6.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 809    
Ending balance [3],[12],[18],[21] $ 805   $ 805    
Investment, Identifier [Axis]: ZRG Partners, LLC | Secured Debt 4          
Schedule of Investments [Line Items]          
Total Rate 9.68% [12],[18],[21]   9.68% [12],[18],[21]   9.73% [10],[17],[24]
Spread 6.00% [12],[18],[19],[21]   6.00% [12],[18],[19],[21]   6.00% [10],[17],[22],[24]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[10],[17],[24]     $ 5,786    
Ending balance [3],[12],[18],[21] $ 935   $ 935    
Investment, Identifier [Axis]: ZRG Partners, LLC | Secured Debt 5          
Schedule of Investments [Line Items]          
Total Rate [12],[18],[21] 9.70%   9.70%    
Spread [12],[18],[19],[21] 6.00%   6.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [3],[12],[18],[21] $ 5,753   $ 5,753    
[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] All portfolio company headquarters are based in the U.S., unless otherwise noted.
[3] 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.
[4] All investments are LMM (as defined below) portfolio investments, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of LMM portfolio investments. All of the Fund’s investments, unless otherwise noted, are encumbered as security for one of the Credit Facilities (as defined below).
[5] “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.
[6] “Control” investments are defined by the 1940 Act (as defined below) 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.
[7] “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.
[8] “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.
[9] Middle Market portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Middle Market portfolio investments.
[10] “Non-Control/Non-Affiliate” investments are defined by the 1940 Act as investments that are neither Control investments nor Affiliate investments.
[11] Middle Market (as defined below) portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Middle Market portfolio investments.
[12] “Non-Control/Non-Affiliate” investments are defined by the 1940 Act as investments that are neither Control investments nor Affiliate investments.
[13] Investments may have a portion, or all, of their income received from Payment-in-Kind (“PIK”) interest or dividends. PIK interest income and cumulative dividend income represent income not paid currently in cash. The difference between the Total Rate and PIK Rate represents the cash rate as of June 30, 2026.
[14] Investments may have a portion, or all, of their income received from PIK interest or dividends. PIK interest income and cumulative dividend income represent income not paid currently in cash. The difference between the Total Rate and PIK Rate represents the cash rate as of December 31, 2025.
[15] Non-accrual or non-income producing debt investment.
[16] Debt investment currently on non-accrual status.
[17] Private Loan portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Private Loan portfolio investments.
[18] Private Loan (as defined below) portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Private Loan portfolio investments.
[19] A majority of the variable rate loans in the Investment Portfolio (as defined below) bear interest at a rate that may be determined by reference to either SOFR (“SF”) or an alternate base rate (commonly based on the federal funds rate or the Prime rate (“P”)), which typically resets every one, three, or six months at the borrower’s option. SOFR based contracts may include a credit spread adjustment (the “Adjustment”) that is charged in addition to the stated spread. The Adjustment is applied when the SOFR, plus the Adjustment, exceeds the stated floor rate, as applicable. As of June 30, 2026, SOFR based contracts in the portfolio had Adjustments ranging from 0.10% to 0.26%.
[20] The position is unfunded and no interest income is being earned as of June 30, 2026. The position may earn a nominal unused facility fee on committed amounts.
[21] 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 1.30%.
[22] A majority of the variable rate loans in the Investment Portfolio bear interest at a rate that may be determined by reference to either SOFR (“SF”) or an alternate base rate (commonly based on the federal funds rate or the Prime rate (“P”)), which typically resets every one, three, or six months at the borrower’s option. SOFR based contracts may include a credit spread adjustment (the “Adjustment”) that is charged in addition to the stated spread. The Adjustment is applied when the SOFR, plus the Adjustment, exceeds the stated floor rate, as applicable. As of December 31, 2025, SOFR based contracts in the portfolio had Adjustments ranging from 0.10% to 0.26%.
[23] The position is unfunded and no interest income is being earned as of December 31, 2025. The position may earn a nominal unused facility fee on committed amounts.
[24] 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 SOFR floors which range between 0.75% and 5.25%, with a weighted-average floor of 1.31%.
[25] Income producing through dividends or distributions.
[26] Income producing through dividends or distributions.
[27] Revolving line of credit facility permits the borrower to make an interest rate election regarding the base rate on each draw under the facility. The rate presented represents a weighted-average rate for borrowings under the facility, as of June 30, 2026.
[28] Revolving line of credit facility permits the borrower to make an interest rate election regarding the base rate on each draw under the facility. The rate presented represents a weighted-average rate for borrowings under the facility, as of December 31, 2025.
[29] Index based floating interest rate is subject to contractual maximum base rate of 3.00%.
[30] Index based floating interest rate is subject to contractual maximum base rate of 3.00%.
[31] Warrants are presented in equivalent shares/units with a strike price of $0.01 per share/unit.
[32] Warrants are presented in equivalent shares/units with a strike price of $0.01 per share/unit.
[33] Shares/Units represent ownership in a related real estate or holding entity.
[34] Shares/Units represent ownership in a related real estate or holding entity.
[35] Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
[36] 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.
[37] Portfolio company headquarters are located outside of the U.S.
[38] Investment is not a qualifying asset as defined under Section 55(a) of the 1940 Act (as defined below). Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets.
[39] Portfolio company headquarters are located outside of the U.S.
[40] Investment is not unitized. Presentation is made in percent of fully diluted ownership unless otherwise indicated.
[41] Other Portfolio investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Other Portfolio investments.
[42] Investment is not unitized. Presentation is made in percent of fully diluted ownership unless otherwise indicated.
[43] Other Portfolio (as defined below) investment. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of Other Portfolio investments.
[44] Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
[45] Non-income producing debt investment.
[46] Principal is net of repayments. Cost is net of repayments and accumulated unearned income. Negative cost is the result of the capitalized discount being greater than the principal amount outstanding on the loan.
[47] Index based floating interest rate is subject to contractual maximum base rate of 4.00%.
[48] Index based floating interest rate is subject to contractual maximum base rate of 4.00%.
[49] 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 June 30, 2026.
[50] Each new draw or funding on the facility has a different floating rate reset date. The rate presented represents a weighted-average rate for borrowings under the facility, as of December 31, 2025.
[51] Investment is accruing income at the fixed cash rate of 2.50% as of December 31, 2025.
[52] The Fund has entered into an intercreditor agreement that entitles the Fund 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 Fund receives a higher interest rate than the contractual stated interest rate of 11.80% per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.
[53] The Fund has entered into an intercreditor agreement that entitles the Fund 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 Fund receives a higher interest rate than the contractual stated interest rate of 11.80% per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.