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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

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