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Summary of Significant Accounting Policies - Schedule of Changes in Investments (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Marketable Securities [Line Items]        
Beginning Balance     $ 1,794,758,336  
Ending Balance $ 1,716,691,417   1,716,691,417  
Level 3        
Marketable Securities [Line Items]        
Beginning Balance     1,765,787,785  
Ending Balance 1,710,619,788   1,710,619,788  
Level 3 | Independent Third-Party Valuation        
Marketable Securities [Line Items]        
Beginning Balance 1,773,752,304 $ 1,953,070,530 1,764,630,382 $ 1,506,246,606
Net realized and unrealized gains (losses) $ (1,870,878) $ (12,638,554) $ (54,220,294) (115,117,572)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments Gain (Loss) on Investments Gain (Loss) on Investments  
Acquisitions $ 66,735,749 $ 79,633,914 $ 226,346,392 812,615,997
Dispositions (140,382,321) (139,090,785) (238,629,446) (329,530,028)
Transfers into Level 3 11,227,978   16,223,633 4,872,975
Transfers out of Level 3 (128,183)   (5,016,018)  
Ending Balance 1,709,334,649 1,879,087,978 1,709,334,649 1,879,087,978
Net change in unrealized appreciation/depreciation during the period on investments still held at period end (included in net realized and unrealized gains/losses, above) $ (13,477,343) $ (10,538,447) $ (31,461,168) (97,771,527)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments  
Level 3 | Valuation Designee        
Marketable Securities [Line Items]        
Beginning Balance $ 1,157,403 $ 877,248 $ 1,157,403 844,615
Net realized and unrealized gains (losses) (447) 274,997 (2,349,058) 307,630
Dispositions     (2,539,224)  
Transfers into Level 3 128,183   5,016,018  
Ending Balance 1,285,139 1,152,245 1,285,139 1,152,245
Net change in unrealized appreciation/depreciation during the period on investments still held at period end (included in net realized and unrealized gains/losses, above) $ (447) $ 274,997 $ 2,349,581 $ 307,630
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Level 3 | Bank Debt | Independent Third-Party Valuation        
Marketable Securities [Line Items]        
Beginning Balance $ 1,525,587,362 $ 1,725,877,106 $ 1,549,242,872 $ 1,289,587,391
Net realized and unrealized gains (losses) $ (2,181,394) $ 5,646,340 $ (55,932,526) $ (74,496,967)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments Gain (Loss) on Investments Gain (Loss) on Investments Gain (Loss) on Investments
Acquisitions $ 65,391,223 $ 61,713,343 $ 186,991,361 $ 747,746,344
Dispositions (124,583,402) (139,090,785) (221,083,573) (326,743,546)
Transfers into Level 3 11,227,978   16,223,633 4,872,975
Transfers out of Level 3 0 (1,887,127) 0  
Ending Balance 1,475,441,767 1,640,966,197 1,475,441,767 1,640,966,197
Net change in unrealized appreciation/depreciation during the period on investments still held at period end (included in net realized and unrealized gains/losses, above) $ (13,419,807) $ (3,546,233) $ (32,537,735) $ (58,869,518)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Level 3 | Bank Debt | Valuation Designee        
Marketable Securities [Line Items]        
Beginning Balance $ 0 $ 0 $ 0 $ 0
Net realized and unrealized gains (losses) 0 0 0 0
Dispositions     0  
Transfers into Level 3 0   0  
Ending Balance 0 0 0 0
Net change in unrealized appreciation/depreciation during the period on investments still held at period end (included in net realized and unrealized gains/losses, above) $ 0 $ 0 $ 0 $ 0
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Level 3 | Other Corporate Debt | Independent Third-Party Valuation        
Marketable Securities [Line Items]        
Beginning Balance $ 59,884,621 $ 66,236,621 $ 64,772,456 $ 52,318,937
Net realized and unrealized gains (losses) $ 0 $ 7,972,085 $ (0) $ (7,168,644)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments Gain (Loss) on Investments Gain (Loss) on Investments Gain (Loss) on Investments
Acquisitions $ 0 $ 7,437,500 $ 0 $ 20,551,743
Dispositions 0 0 0 0
Transfers into Level 3 0   0 0
Transfers out of Level 3 (128,183) 0 (5,016,018)  
Ending Balance 59,756,438 65,702,036 59,756,438 65,702,036
Net change in unrealized appreciation/depreciation during the period on investments still held at period end (included in net realized and unrealized gains/losses, above) $ 0 $ 7,972,085 $ (0) $ 7,168,644
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Level 3 | Other Corporate Debt | Valuation Designee        
Marketable Securities [Line Items]        
Beginning Balance $ 0 $ 0 $ 0 $ 0
Net realized and unrealized gains (losses) (693) 0 (2,349,304) 0
Dispositions     (2,539,224)  
Transfers into Level 3 128,183   5,016,018  
Ending Balance 127,490 0 127,490 0
Net change in unrealized appreciation/depreciation during the period on investments still held at period end (included in net realized and unrealized gains/losses, above) $ (693) $ 0 $ (2,349,828) $ 0
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Level 3 | Equity Securities | Independent Third-Party Valuation        
Marketable Securities [Line Items]        
Beginning Balance $ 188,280,321 $ 160,956,803 $ 150,615,054 $ 164,340,278
Net realized and unrealized gains (losses) $ 310,516 $ (979,871) $ 1,712,232 $ (33,451,961)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Investments Gain (Loss) on Investments Gain (Loss) on Investments Gain (Loss) on Investments
Acquisitions $ 1,344,526 $ 10,483,071 $ 39,355,031 $ 44,317,910
Dispositions (15,798,919) 0 (17,545,873) (2,786,482)
Transfers into Level 3 0   0 0
Transfers out of Level 3 0 0 0  
Ending Balance 174,136,444 172,419,745 174,136,444 172,419,745
Net change in unrealized appreciation/depreciation during the period on investments still held at period end (included in net realized and unrealized gains/losses, above) $ (57,536) $ (979,871) $ 1,076,567 $ (31,733,365)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments
Level 3 | Equity Securities | Valuation Designee        
Marketable Securities [Line Items]        
Beginning Balance $ 1,157,403 $ 877,248 $ 1,157,403 $ 844,615
Net realized and unrealized gains (losses) 246 274,997 246 307,630
Dispositions     0  
Transfers into Level 3 0   0  
Ending Balance 1,157,649 1,152,245 1,157,649 1,152,245
Net change in unrealized appreciation/depreciation during the period on investments still held at period end (included in net realized and unrealized gains/losses, above) $ 246 $ 274,997 $ 246 $ 307,630
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments