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INVESTMENTS - Schedule of Contributed Capital and Unfunded Commitments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Feb. 08, 2021
May 13, 2020
Schedule of Investments [Line Items]          
Total unfunded commitments $ 279,806   $ 305,903    
All Member Of Waccamaw River LLC          
Schedule of Investments [Line Items]          
Total contributed capital 125,000        
Affiliated Entity | Thompson Rivers LLC          
Schedule of Investments [Line Items]          
Investment company, dividend reinvestment 32,100   32,100    
Affiliated Entity | Waccamaw River, LLC | All Member Of Waccamaw River LLC          
Schedule of Investments [Line Items]          
Contributed capital by related parties 82,000 $ 82,000      
Investment, Identifier [Axis]: AD Bidco, Inc., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 3,522   0    
Investment, Identifier [Axis]: AD Bidco, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,303   0    
Investment, Identifier [Axis]: ASC Communications, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,089   1,089    
Investment, Identifier [Axis]: ATL II MRO Holdings, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,667   1,667    
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 461   634    
Investment, Identifier [Axis]: Adhefin International, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 410   419    
Investment, Identifier [Axis]: AirX Climate Solutions, Inc., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,179   1,179    
Investment, Identifier [Axis]: AirX Climate Solutions, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 399   482    
Investment, Identifier [Axis]: AlliA Insurance Brokers NV, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,598   1,634    
Investment, Identifier [Axis]: Americo Chemical Products, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 471   471    
Investment, Identifier [Axis]: Amtech LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 974   436    
Investment, Identifier [Axis]: Anju Software, Inc., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 343   343    
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Capex / Acquisition Facility          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,201   2,221    
Investment, Identifier [Axis]: Arc Education, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,263   1,291    
Investment, Identifier [Axis]: Argus Bidco Limited, CAF Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 361   541    
Investment, Identifier [Axis]: Astra Bidco Limited, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 515   604    
Investment, Identifier [Axis]: Avance Clinical Bidco Pty Ltd, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,246   1,304    
Investment, Identifier [Axis]: Azalea Buyer, Inc., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 644   644    
Investment, Identifier [Axis]: Azalea Buyer, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 481   481    
Investment, Identifier [Axis]: Beyond Risk Management, Inc., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,007   2,007    
Investment, Identifier [Axis]: Biolam Group, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 652   667    
Investment, Identifier [Axis]: Bounteous, Inc., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   2,840    
Investment, Identifier [Axis]: BrightSign LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 266   443    
Investment, Identifier [Axis]: Brightpay Limited, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 137   140    
Investment, Identifier [Axis]: CAi Software, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,523   943    
Investment, Identifier [Axis]: CCFF Buyer, LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 3,490   0    
Investment, Identifier [Axis]: CCFF Buyer, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,047   0    
Investment, Identifier [Axis]: CGI Parent, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,653   1,653    
Investment, Identifier [Axis]: CSL Dualcom, Capex / Acquisition Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 149   150    
Investment, Identifier [Axis]: Cascade Residential Services LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,509   1,985    
Investment, Identifier [Axis]: Cascade Residential Services LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 331   331    
Investment, Identifier [Axis]: Catawba River Limited, Structured Junior Note          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   13,971    
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Delayed Draw Term Loan 1          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,014   2,734    
Investment, Identifier [Axis]: Comply365, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,101   1,101    
Investment, Identifier [Axis]: Coyo Uprising GmbH, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 424   434    
Investment, Identifier [Axis]: DISA Holdings Corp., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   1,072    
Investment, Identifier [Axis]: DISA Holdings Corp., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 429   339    
Investment, Identifier [Axis]: DataServ Integrations, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 481   481    
Investment, Identifier [Axis]: DecksDirect, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 169   381    
Investment, Identifier [Axis]: Dune Group, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 429   439    
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 59   403    
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 16,818   17,182    
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Delayed Draw Term Loan 1          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,670   2,731    
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 620   620    
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 115   115    
Investment, Identifier [Axis]: Faraday, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 968   990    
Investment, Identifier [Axis]: Finexvet, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   650    
Investment, Identifier [Axis]: Footco 40 Limited, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 519   524    
Investment, Identifier [Axis]: Forest Buyer, LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 496   0    
Investment, Identifier [Axis]: Forest Buyer, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 298   0    
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 694   0    
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 625   0    
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,581   2,581    
Investment, Identifier [Axis]: GPNZ II GmbH, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 86   0    
Investment, Identifier [Axis]: GPNZ II GmbH, Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 17   53    
Investment, Identifier [Axis]: Global Academic Group Limited, Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 391   414    
Investment, Identifier [Axis]: Greenhill II BV, Capex Acquisition Facility          
Schedule of Investments [Line Items]          
Total unfunded commitments 118   120    
Investment, Identifier [Axis]: Gusto Aus BidCo Pty Ltd, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 159   167    
Investment, Identifier [Axis]: HEKA Invest, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 562   575    
Investment, Identifier [Axis]: HTI Technology & Industries, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,045   2,045    
Investment, Identifier [Axis]: HTI Technology & Industries, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,364   1,364    
Investment, Identifier [Axis]: HeartHealth Bidco Pty Ltd, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 239   253    
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,632   2,632    
Investment, Identifier [Axis]: HemaSource, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,489   1,421    
Investment, Identifier [Axis]: HomeX Services Group, LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 845   845    
Investment, Identifier [Axis]: HomeX Services Group, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 338   338    
Investment, Identifier [Axis]: INOS 19-090 GmbH, Acquisition Facility          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   1,872    
Investment, Identifier [Axis]: ISTO Technologies II, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 714   714    
Investment, Identifier [Axis]: ITI Intermodal, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,157   1,157    
Investment, Identifier [Axis]: Ice House America, L.L.C., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 165   0    
Investment, Identifier [Axis]: Ice House America, L.L.C., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 383   0    
Investment, Identifier [Axis]: Innovad Group II BV, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 260   266    
Investment, Identifier [Axis]: Interstellar Group B.V., Delayed Draw Term Loan 1          
Schedule of Investments [Line Items]          
Total unfunded commitments 607   620    
Investment, Identifier [Axis]: Interstellar Group B.V., Delayed Draw Term Loan 2          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   57    
Investment, Identifier [Axis]: InvoCare Limited, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 370   387    
Investment, Identifier [Axis]: Isolstar Holding NV (IPCOM), Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 171   656    
Investment, Identifier [Axis]: Jocassee Partners LLC          
Schedule of Investments [Line Items]          
Total contributed capital 35,000   35,000    
Total unfunded commitments 65,000   65,000    
Investment, Identifier [Axis]: Jocassee Partners LLC | All Members Of Jocassee Partners LLC          
Schedule of Investments [Line Items]          
Total contributed capital 385,000   385,000    
Total unfunded commitments 215,000   215,000    
Investment, Identifier [Axis]: Jocassee Partners LLC, Joint Venture          
Schedule of Investments [Line Items]          
Total unfunded commitments 65,000   65,000    
Investment, Identifier [Axis]: Jon Bidco Limited, Capex & Acquisition Facility          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,063   1,125    
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 418   418    
Investment, Identifier [Axis]: Kano Laboratories LLC, Delayed Draw Term Loan 1          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   153    
Investment, Identifier [Axis]: Kano Laboratories LLC, Delayed Draw Term Loan 2          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   2,830    
Investment, Identifier [Axis]: Lambir Bidco Limited, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 612   626    
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 237   255    
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 18   18    
Investment, Identifier [Axis]: LeadsOnline, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,603   2,187    
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,500   2,500    
Investment, Identifier [Axis]: MB Purchaser, LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,545   0    
Investment, Identifier [Axis]: MB Purchaser, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 309   0    
Investment, Identifier [Axis]: MC Group Ventures Corporation, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 276   276    
Investment, Identifier [Axis]: Marmoutier Holding B.V., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 24   18    
Investment, Identifier [Axis]: Marmoutier Holding B.V., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 108   109    
Investment, Identifier [Axis]: Marshall Excelsior Co., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 165   221    
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 665   0    
Investment, Identifier [Axis]: Mercell Holding AS, Capex Acquisition Facility          
Schedule of Investments [Line Items]          
Total unfunded commitments 724   773    
Investment, Identifier [Axis]: Modern Star Holdings Bidco Pty Limited, Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 932   974    
Investment, Identifier [Axis]: Moonlight Bidco Limited, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 556   562    
Investment, Identifier [Axis]: NAW Buyer LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 5,876   5,876    
Investment, Identifier [Axis]: NAW Buyer LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,705   1,515    
Investment, Identifier [Axis]: NF Holdco, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 884   663    
Investment, Identifier [Axis]: NPM Investments 28 BV, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 468   479    
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,311   1,311    
Investment, Identifier [Axis]: NeoxCo, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 486   497    
Investment, Identifier [Axis]: Next HoldCo, LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,891   1,891    
Investment, Identifier [Axis]: Next HoldCo, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 733   733    
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Capex & Acquisition Facility          
Schedule of Investments [Line Items]          
Total unfunded commitments 809   809    
Investment, Identifier [Axis]: OA Buyer, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,154   1,331    
Investment, Identifier [Axis]: OAC Holdings I Corp, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,076   1,370    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 5,345   5,345    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,109   1,109    
Investment, Identifier [Axis]: PDQ.Com Corporation, Delayed Draw Term Loan 1          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,970   1,970    
Investment, Identifier [Axis]: PDQ.Com Corporation, Delayed Draw Term Loan 2          
Schedule of Investments [Line Items]          
Total unfunded commitments 4,807   4,807    
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 202   206    
Investment, Identifier [Axis]: Parkview Dental Holdings, LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 328   328    
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 545   545    
Investment, Identifier [Axis]: Premium Invest, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,674   1,712    
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 935   935    
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   1,014    
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Revolver 1          
Schedule of Investments [Line Items]          
Total unfunded commitments 862   0    
Investment, Identifier [Axis]: ProfitOptics, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 89   210    
Investment, Identifier [Axis]: Protego Bidco B.V., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 508   656    
Investment, Identifier [Axis]: Qualified Industries, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 242   242    
Investment, Identifier [Axis]: R1 Holdings, LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,682   1,682    
Investment, Identifier [Axis]: R1 Holdings, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,947   1,947    
Investment, Identifier [Axis]: RA Outdoors, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   438    
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 873   3,333    
Investment, Identifier [Axis]: Randys Holdings, Inc., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 3,003   3,412    
Investment, Identifier [Axis]: Randys Holdings, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,373   1,326    
Investment, Identifier [Axis]: Rhondda Financing No. 1 DAC, Structured Junior Note          
Schedule of Investments [Line Items]          
Total unfunded commitments 4,615   4,707    
Investment, Identifier [Axis]: Rocade Holdings LLC          
Schedule of Investments [Line Items]          
Total unfunded commitments 17,500        
Investment, Identifier [Axis]: Rocade Holdings LLC, Preferred Equity          
Schedule of Investments [Line Items]          
Total unfunded commitments 17,500   17,500    
Investment, Identifier [Axis]: Rock Labor, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,103   1,103    
Investment, Identifier [Axis]: Royal Buyer, LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 922   922    
Investment, Identifier [Axis]: Royal Buyer, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,748   1,340    
Investment, Identifier [Axis]: SBP Holdings LP, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   151    
Investment, Identifier [Axis]: SBP Holdings LP, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 710   1,065    
Investment, Identifier [Axis]: SISU ACQUISITIONCO., INC., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 503   1,007    
Investment, Identifier [Axis]: SSCP Pegasus Midco Limited, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 3,428   4,119    
Investment, Identifier [Axis]: SVI International LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 74   0    
Investment, Identifier [Axis]: SVI International LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 74   0    
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Acquisition Capex Facility          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   16    
Investment, Identifier [Axis]: Sanoptis S.A.R.L., CAF Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 461   1,458    
Investment, Identifier [Axis]: Scaled Agile, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 280   280    
Investment, Identifier [Axis]: Scout Bidco B.V., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 625   640    
Investment, Identifier [Axis]: Security Holdings B.V., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,160   2,209    
Investment, Identifier [Axis]: Security Holdings B.V., Revolver 1          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,080   1,105    
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV LLC (Sierra JV)          
Schedule of Investments [Line Items]          
Total contributed capital 110,100        
Investment, Identifier [Axis]: Sinari Invest, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 603   617    
Investment, Identifier [Axis]: SmartShift Group, Inc., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 3,440   3,440    
Investment, Identifier [Axis]: SmartShift Group, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,651   1,651    
Investment, Identifier [Axis]: Smartling, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,176   1,176    
Investment, Identifier [Axis]: Solo Buyer, L.P., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,330   1,330    
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 399   399    
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 117   90    
Investment, Identifier [Axis]: Spatial Business Systems LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,875   1,875    
Investment, Identifier [Axis]: Spatial Business Systems LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,406   1,406    
Investment, Identifier [Axis]: Superjet Buyer, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,369   1,369    
Investment, Identifier [Axis]: Syntax Systems Ltd, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 283   391    
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Delayed Draw Term Loan 1          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,244   2,244    
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Delayed Draw Term Loan 2          
Schedule of Investments [Line Items]          
Total unfunded commitments 911   1,469    
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 642   642    
Investment, Identifier [Axis]: Tank Holding Corp, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 509   614    
Investment, Identifier [Axis]: Tank Holding Corp, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 655   640    
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Capex Facility          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,143   1,153    
Investment, Identifier [Axis]: Techone B.V., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 513   315    
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 1,129   1,129    
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   1,825    
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 827   827    
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 3,229   3,229    
Investment, Identifier [Axis]: The Hilb Group, LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   313    
Investment, Identifier [Axis]: Thompson Rivers LLC          
Schedule of Investments [Line Items]          
Total contributed capital         $ 75,000
Investment, Identifier [Axis]: Thompsonn Rivers LLC          
Schedule of Investments [Line Items]          
Total contributed capital 79,411   79,411    
Total unfunded commitments 0   0    
Investment company, dividend reinvestment 4,400 $ 4,400      
Investment, Identifier [Axis]: Thompsonn Rivers LLC | All Members Of Thompson Rivers LLC          
Schedule of Investments [Line Items]          
Total contributed capital 482,083   482,083    
Total unfunded commitments 0   0    
Investment, Identifier [Axis]: Trader Corporation, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 345   354    
Investment, Identifier [Axis]: Trintech, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 383   383    
Investment, Identifier [Axis]: Turbo Buyer, Inc., Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   1,350    
Investment, Identifier [Axis]: UBC Ledgers Holding AB, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 791   840    
Investment, Identifier [Axis]: UBC Ledgers Holding AB, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 262   278    
Investment, Identifier [Axis]: USLS Acquisition, Inc.(f/k/a US Legal Support, Inc.), Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,512   2,540    
Investment, Identifier [Axis]: Union Bidco Limited, Acquisition Facility          
Schedule of Investments [Line Items]          
Total unfunded commitments 82   83    
Investment, Identifier [Axis]: United Therapy Holding III GmbH, Acquisition Facility          
Schedule of Investments [Line Items]          
Total unfunded commitments 668   683    
Investment, Identifier [Axis]: Unither (Uniholding), Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 468   479    
Investment, Identifier [Axis]: WWEC Holdings III Corp, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,484   2,019    
Investment, Identifier [Axis]: Waccamaw River LLC          
Schedule of Investments [Line Items]          
Total contributed capital 30,280   30,280 $ 25,000  
Total return of capital (recallable) (5,300)        
Total unfunded commitments 0   0    
Investment, Identifier [Axis]: Waccamaw River LLC | All Member Of Waccamaw River LLC          
Schedule of Investments [Line Items]          
Total contributed capital 139,020   139,020    
Total return of capital (recallable) (14,000)        
Total unfunded commitments 0   0    
Investment, Identifier [Axis]: West-NR AcquisitionCo., LLC, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,500   2,500    
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 981   1,760    
Investment, Identifier [Axis]: White Bidco Limited, Delayed Draw Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 514   514    
Investment, Identifier [Axis]: Woodland Foods, Inc., Line of Credit          
Schedule of Investments [Line Items]          
Total unfunded commitments 336   680    
Investment, Identifier [Axis]: World 50, Inc., Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 973   0    
Investment, Identifier [Axis]: Xeinadin Bidco Limited, CAF Term Loan          
Schedule of Investments [Line Items]          
Total unfunded commitments 2,099   2,704    
Investment, Identifier [Axis]: ZB Holdco LLC, Delayed Draw Term Loan 1          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   2,932    
Investment, Identifier [Axis]: ZB Holdco LLC, Delayed Draw Term Loan 2          
Schedule of Investments [Line Items]          
Total unfunded commitments 762   0    
Investment, Identifier [Axis]: ZB Holdco LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments 541   845    
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Capex / Acquisition Facility          
Schedule of Investments [Line Items]          
Total unfunded commitments 0   2,667    
Investment, Identifier [Axis]: eShipping, LLC, Revolver          
Schedule of Investments [Line Items]          
Total unfunded commitments $ 1,216   $ 1,486