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INVESTMENTS - Capital and Unfunded Commitments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2023
Dec. 31, 2022
Feb. 08, 2021
May 13, 2020
Schedule of Investments [Line Items]            
Total unfunded commitments $ 371,795 $ 308,532 $ 371,795 $ 308,532    
All Member Of Waccamaw River LLC            
Schedule of Investments [Line Items]            
Total contributed capital 125,000   125,000      
Affiliated Entity | Waccamaw River, LLC | All Member Of Waccamaw River LLC            
Schedule of Investments [Line Items]            
Total return of capital (recallable) (7,000) (7,000) (7,000) (7,000)    
Total unfunded commitments 7,400 7,400 7,400 7,400    
Contributed capital by related parties 74,600 74,600        
Affiliated Entity | Thompson Rivers LLC            
Schedule of Investments [Line Items]            
Investment company, dividend reinvestment     32,100 162,100    
Investment, Identifier [Axis]: APC1 Holding, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 354 0 354    
Investment, Identifier [Axis]: ASC Communications, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,089 1,089 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 1,667 1,667    
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 922 1,152 922 1,152    
Investment, Identifier [Axis]: AlliA Insurance Brokers NV, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,055 0 2,055 0    
Investment, Identifier [Axis]: Amtech LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,527 1,527 1,527 1,527    
Investment, Identifier [Axis]: Amtech LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 682 545 682 545    
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Bridge Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 373 366 373 366    
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Capex / Acquisition Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,155 2,543 2,155 2,543    
Investment, Identifier [Axis]: Arc Education, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,934 1,900 1,934 1,900    
Investment, Identifier [Axis]: Argus Bidco Limited, CAF Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 674 789 674 789    
Investment, Identifier [Axis]: Argus Bidco Limited, RCF Bridge Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 172 168 172 168    
Investment, Identifier [Axis]: Astra Bidco Limited, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 901 876 901 876    
Investment, Identifier [Axis]: Avance Clinical Bidco Pty Ltd, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,280 1,295 1,280 1,295    
Investment, Identifier [Axis]: Azalea Buyer, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 962 962 962 962    
Investment, Identifier [Axis]: Azalea Buyer, Inc., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 481 481 481 481    
Investment, Identifier [Axis]: Bariacum S.A, Acquisition Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,064 2,028 2,064 2,028    
Investment, Identifier [Axis]: Beyond Risk Management, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,423 2,423 2,423 2,423    
Investment, Identifier [Axis]: Biolam Group, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 4,152 4,783 4,152 4,783    
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 417 417 417 417    
Investment, Identifier [Axis]: Bounteous, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,840 2,840 2,840 2,840    
Investment, Identifier [Axis]: BrightSign LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 1,329 0 1,329    
Investment, Identifier [Axis]: Brightpay Limited, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 138 135 138 135    
Investment, Identifier [Axis]: CAi Software, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 943 943 943 943    
Investment, Identifier [Axis]: CGI Parent, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,653 1,653 1,653 1,653    
Investment, Identifier [Axis]: CSL Dualcom, Capex / Acquisition Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 146 142 146 142    
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 110 0 110    
Investment, Identifier [Axis]: Catawba River Limited, Structured Junior Note            
Schedule of Investments [Line Items]            
Total unfunded commitments 12,999 12,635 12,999 12,635    
Investment, Identifier [Axis]: Centralis Finco S.a.r.l., Incremental CAF Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 921 1,028 921 1,028    
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 78 78 78 78    
Investment, Identifier [Axis]: Comply365, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,101 935 1,101 935    
Investment, Identifier [Axis]: Coyo Uprising GmbH, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 427 419 427 419    
Investment, Identifier [Axis]: DISA Holdings Corp., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,368 1,368 1,368 1,368    
Investment, Identifier [Axis]: DISA Holdings Corp., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 429 416 429 416    
Investment, Identifier [Axis]: DataServ Integrations, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 481 481 481 481    
Investment, Identifier [Axis]: DecksDirect, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 218 218 218 218    
Investment, Identifier [Axis]: DreamStart Bidco SAS (d/b/a SmartTrade), Acquisition Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 579 0 579    
Investment, Identifier [Axis]: Dune Group, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 635 624 635 624    
Investment, Identifier [Axis]: Dwyer Instruments, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 5,165 5,164 5,165 5,164    
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 9,272 9,272 9,272 9,272    
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,092 1,471 1,092 1,471    
Investment, Identifier [Axis]: EPS NASS Parent, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 257 257 257 257    
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 18,364 17,455 18,364 17,455    
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Delayed Draw Term Loan 1            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,686 2,639 2,686 2,639    
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Delayed Draw Term Loan 2            
Schedule of Investments [Line Items]            
Total unfunded commitments 537 528 537 528    
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 640 640 640 640    
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 115 115 115 115    
Investment, Identifier [Axis]: F24 (Stairway BidCo GmbH), Acquisition Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 230 246 230 246    
Investment, Identifier [Axis]: Faraday, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 974 0 974 0    
Investment, Identifier [Axis]: Fineline Technologies, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 180 0 180    
Investment, Identifier [Axis]: Footco 40 Limited, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 556 766 556 766    
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 925 925 925 925    
Investment, Identifier [Axis]: FragilePak LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,354 2,354 2,354 2,354    
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,581 2,581 2,581 2,581    
Investment, Identifier [Axis]: GPZN II GmbH, CAF Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 560 0 560    
Investment, Identifier [Axis]: Global Academic Group Limited, Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 446 451 446 451    
Investment, Identifier [Axis]: Greenhill II BV, Capex Acquisition Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 260 255 260 255    
Investment, Identifier [Axis]: Groupe Product Life, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 449 441 449 441    
Investment, Identifier [Axis]: Gusto Aus BidCo Pty Ltd, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 220 223 220 223    
Investment, Identifier [Axis]: HEKA Invest, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 565 555 565 555    
Investment, Identifier [Axis]: HTI Technology & Industries, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,045 2,045 2,045 2,045    
Investment, Identifier [Axis]: HTI Technology & Industries, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,364 1,364 1,364 1,364    
Investment, Identifier [Axis]: HW Holdco, LLC (Hanley Wood LLC), Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 556 913 556 913    
Investment, Identifier [Axis]: HeartHealth Bidco Pty Ltd, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 309 313 309 313    
Investment, Identifier [Axis]: Heartland Veterinary Partners, LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 267 267 267 267    
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,632 2,632 2,632 2,632    
Investment, Identifier [Axis]: INOS 19-090 GmbH, Acquisition Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,422 2,380 2,422 2,380    
Investment, Identifier [Axis]: ITI Intermodal, Inc., Delayed Draw Term Loan1            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 103 0 103    
Investment, Identifier [Axis]: ITI Intermodal, Inc., Delayed Draw Term Loan2            
Schedule of Investments [Line Items]            
Total unfunded commitments 4,249 0 4,249 0    
Investment, Identifier [Axis]: ITI Intermodal, Inc., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 857 118 857 118    
Investment, Identifier [Axis]: Innovad Group II BV, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,284 1,261 1,284 1,261    
Investment, Identifier [Axis]: Interstellar Group B.V., Delayed Draw Term Loan 1            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,334 1,310 1,334 1,310    
Investment, Identifier [Axis]: Interstellar Group B.V., Delayed Draw Term Loan 2            
Schedule of Investments [Line Items]            
Total unfunded commitments 56 55 56 55    
Investment, Identifier [Axis]: Isolstar Holding NV (IPCOM), Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 757 744 757 744    
Investment, Identifier [Axis]: Jaguar Merger Sub Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 422 0 422    
Investment, Identifier [Axis]: Jaguar Merger Sub Inc., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 490 0 490    
Investment, Identifier [Axis]: Jocassee Partners LLC            
Schedule of Investments [Line Items]            
Total contributed capital 35,000 35,000 35,000 35,000    
Total unfunded commitments 65,000 65,000 65,000 65,000    
Investment, Identifier [Axis]: Jocassee Partners LLC | All Members Of Jocassee Partners LLC            
Schedule of Investments [Line Items]            
Total contributed capital 385,000 385,000 385,000 385,000    
Total unfunded commitments 215,000 215,000 215,000 215,000    
Investment, Identifier [Axis]: Jocassee Partners LLC, Joint Venture            
Schedule of Investments [Line Items]            
Total unfunded commitments 65,000 65,000 65,000 65,000    
Investment, Identifier [Axis]: Jon Bidco Limited, Capex & Acquisition Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,425 1,441 1,425 1,441    
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 418 418 418 418    
Investment, Identifier [Axis]: Kano Laboratories LLC, Delayed Draw Term Loan 1            
Schedule of Investments [Line Items]            
Total unfunded commitments 153 153 153 153    
Investment, Identifier [Axis]: Kano Laboratories LLC, Delayed Draw Term Loan 2            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,830 2,830 2,830 2,830    
Investment, Identifier [Axis]: Kemmerer Operations LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 908 0 908    
Investment, Identifier [Axis]: Lambir Bidco Limited, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,797 1,766 1,797 1,766    
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 255 298 255 298    
Investment, Identifier [Axis]: LeadsOnline, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,603 2,603 2,603 2,603    
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,500 2,500 2,500 2,500    
Investment, Identifier [Axis]: LivTech Purchaser, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 138 138 138 138    
Investment, Identifier [Axis]: MC Group Ventures Corporation, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 296 296 296 296    
Investment, Identifier [Axis]: Marmoutier Holding B.V., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 24 24 24 24    
Investment, Identifier [Axis]: Marmoutier Holding B.V., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 108 106 108 106    
Investment, Identifier [Axis]: Marshall Excelsior Co., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 55 413 55 413    
Investment, Identifier [Axis]: Mercell Holding AS, Capex Acquisition Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 750 797 750 797    
Investment, Identifier [Axis]: Modern Star Holdings Bidco Pty Limited, Capex Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 956 968 956 968    
Investment, Identifier [Axis]: Murphy Midco Limited, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 361 407 361 407    
Investment, Identifier [Axis]: NF Holdco, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,105 0 1,105 0    
Investment, Identifier [Axis]: NPM Investments 28 BV, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 471 463 471 463    
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,180 1,180 1,180 1,180    
Investment, Identifier [Axis]: NeoxCo, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 489 0 489 0    
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Acquisition Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 374 443 374 443    
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Capex & Acquisition Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 809 809 809 809    
Investment, Identifier [Axis]: OA Buyer, Inc., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,331 1,331 1,331 1,331    
Investment, Identifier [Axis]: OAC Holdings I Corp, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 254 607 254 607    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 384 187 384 187    
Investment, Identifier [Axis]: Omni Intermediate Holdings, LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 2,289 0 2,289    
Investment, Identifier [Axis]: PDQ.Com Corporation, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 6,885 6,885 6,885 6,885    
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 740 727 740 727    
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 545 545 545 545    
Investment, Identifier [Axis]: Premium Invest, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,933 2,882 2,933 2,882    
Investment, Identifier [Axis]: ProfitOptics, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 306 484 306 484    
Investment, Identifier [Axis]: Protego Bidco B.V., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 807 792 807 792    
Investment, Identifier [Axis]: Qualified Industries, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 242 0 242 0    
Investment, Identifier [Axis]: R1 Holdings, LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,820 2,623 1,820 2,623    
Investment, Identifier [Axis]: R1 Holdings, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,601 1,601 1,601 1,601    
Investment, Identifier [Axis]: RA Outdoors, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 864 1,235 864 1,235    
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,587 2,381 1,587 2,381    
Investment, Identifier [Axis]: Randys Holdings, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 4,412 4,412 4,412 4,412    
Investment, Identifier [Axis]: Randys Holdings, Inc., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,513 1,571 1,513 1,571    
Investment, Identifier [Axis]: Rep Seko Merger Sub LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 579 725 579 725    
Investment, Identifier [Axis]: Reward Gateway (UK) Ltd, Acquisition Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 617 600 617 600    
Investment, Identifier [Axis]: Rhondda Financing No. 1 DAC, Structured Junior Note            
Schedule of Investments [Line Items]            
Total unfunded commitments 22,914 0 22,914 0    
Investment, Identifier [Axis]: Rocade Holdings LLC, Preferred Equity            
Schedule of Investments [Line Items]            
Total unfunded commitments 40,000 0 40,000 0    
Investment, Identifier [Axis]: Royal Buyer, LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,082 2,209 2,082 2,209    
Investment, Identifier [Axis]: Royal Buyer, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,340 1,340 1,340 1,340    
Investment, Identifier [Axis]: SBP Holdings LP, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,469 0 1,469 0    
Investment, Identifier [Axis]: SBP Holdings LP, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 887 0 887 0    
Investment, Identifier [Axis]: SSCP Pegasus Midco Limited, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 4,794 4,664 4,794 4,664    
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Acquisition Capex Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 846 1,751 846 1,751    
Investment, Identifier [Axis]: Sanoptis S.A.R.L., CAF Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 445 0 445 0    
Investment, Identifier [Axis]: Scaled Agile, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 416 416 416 416    
Investment, Identifier [Axis]: Scaled Agile, Inc., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 336 336 336 336    
Investment, Identifier [Axis]: Scout Bidco B.V., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,311 2,270 2,311 2,270    
Investment, Identifier [Axis]: Scout Bidco B.V., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,049 1,030 1,049 1,030    
Investment, Identifier [Axis]: Security Holdings B.V., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,173 2,134 2,173 2,134    
Investment, Identifier [Axis]: Security Holdings B.V., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,086 1,067 1,086 1,067    
Investment, Identifier [Axis]: Sereni Capital NV, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,599 0 1,599 0    
Investment, Identifier [Axis]: Sereni Capital NV, Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 109 0 109    
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV LLC (Sierra JV)            
Schedule of Investments [Line Items]            
Total contributed capital 110,100   110,100      
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV LLC (Sierra JV) | All Members Of Sierra JV            
Schedule of Investments [Line Items]            
Total contributed capital 124,500   124,500      
Investment, Identifier [Axis]: Smartling, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,978 1,978 1,978 1,978    
Investment, Identifier [Axis]: Smartling, Inc., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,176 1,176 1,176 1,176    
Investment, Identifier [Axis]: Smile Brands Group, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 38 0 38    
Investment, Identifier [Axis]: Soho Square III Debtco II SARL, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 3,478 3,383 3,478 3,383    
Investment, Identifier [Axis]: Solo Buyer, L.P., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,995 1,995 1,995 1,995    
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 399 666 399 666    
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 141 156 141 156    
Investment, Identifier [Axis]: Spatial Business Systems LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 7,500 7,500 7,500 7,500    
Investment, Identifier [Axis]: Spatial Business Systems LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,406 1,406 1,406 1,406    
Investment, Identifier [Axis]: Superjet Buyer, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,825 1,825 1,825 1,825    
Investment, Identifier [Axis]: Syntax Systems Ltd, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,933 1,933 1,933 1,933    
Investment, Identifier [Axis]: Syntax Systems Ltd, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 202 337 202 337    
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,681 1,681 1,681 1,681    
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 177 177 177 177    
Investment, Identifier [Axis]: Tank Holding Corp, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 625 698 625 698    
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Capex Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,118 1,088 1,118 1,088    
Investment, Identifier [Axis]: Techone B.V., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 310 203 310 203    
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,129 1,129 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 2,811 2,811 2,811 2,811    
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 827 827 827 827    
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 3,229 2,826 3,229 2,826    
Investment, Identifier [Axis]: The Hilb Group, LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 858 1,182 858 1,182    
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 79,411 79,411    
Total unfunded commitments 0 0 0 0    
Investment company, dividend reinvestment     4,400      
Investment, Identifier [Axis]: Thompsonn Rivers LLC | All Members Of Thompson Rivers LLC            
Schedule of Investments [Line Items]            
Total contributed capital 482,083 482,083 482,083 482,083    
Total unfunded commitments 0 0 0 0    
Investment, Identifier [Axis]: Trader Corporation, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 345 345 345 345    
Investment, Identifier [Axis]: Turbo Buyer, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,350 1,350 1,350 1,350    
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 3,629 3,629 3,629 3,629    
Investment, Identifier [Axis]: Union Bidco Limited, Acquisition Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 80 78 80 78    
Investment, Identifier [Axis]: United Therapy Holding III GmbH, Acquisition Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 672 1,170 672 1,170    
Investment, Identifier [Axis]: Unither (Uniholding), Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 471 0 471 0    
Investment, Identifier [Axis]: W2O Holdings, Inc., Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 2,622 0 2,622    
Investment, Identifier [Axis]: WWEC Holdings III Corp, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 3,106 3,106 3,106 3,106    
Investment, Identifier [Axis]: WWEC Holdings III Corp, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,367 1,366 1,367 1,366    
Investment, Identifier [Axis]: Waccamaw River LLC            
Schedule of Investments [Line Items]            
Total contributed capital 27,800 27,800 27,800 27,800 $ 25,000  
Total return of capital (recallable) (5,280) (5,280) (5,280) (5,280) (5,300)  
Total unfunded commitments 2,480 2,480 2,480 2,480    
Investment, Identifier [Axis]: Waccamaw River LLC | All Member Of Waccamaw River LLC            
Schedule of Investments [Line Items]            
Total contributed capital 126,620 126,620 126,620 126,620    
Total return of capital (recallable) (14,020) (14,020) (14,020) (14,020)    
Total unfunded commitments 12,400 12,400 12,400 12,400    
Investment, Identifier [Axis]: Waccamaw River LLC Capital Commitment - Funded            
Schedule of Investments [Line Items]            
Total contributed capital         $ 22,500  
Investment, Identifier [Axis]: Waccamaw River LLC Capital Commitment - Funded | All Member Of Waccamaw River LLC            
Schedule of Investments [Line Items]            
Total contributed capital 112,600   112,600      
Investment, Identifier [Axis]: Waccamaw River, Joint Venture            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,480 2,480 2,480 2,480    
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,886 0 1,886 0    
Investment, Identifier [Axis]: Woodland Foods, Inc., Line of Credit            
Schedule of Investments [Line Items]            
Total unfunded commitments 456 456 456 456    
Investment, Identifier [Axis]: Xeinadin Bidco Limited, CAF Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 3,196 3,109 3,196 3,109    
Investment, Identifier [Axis]: ZB Holdco LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 0 1,352 0 1,352    
Investment, Identifier [Axis]: ZB Holdco LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments 845 845 845 845    
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Capex / Acquisition Facility            
Schedule of Investments [Line Items]            
Total unfunded commitments 2,587 2,516 2,587 2,516    
Investment, Identifier [Axis]: eShipping, LLC, Delayed Draw Term Loan            
Schedule of Investments [Line Items]            
Total unfunded commitments 1,650 1,650 1,650 1,650    
Investment, Identifier [Axis]: eShipping, LLC, Revolver            
Schedule of Investments [Line Items]            
Total unfunded commitments $ 1,486 $ 1,486 $ 1,486 $ 1,486