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v3.25.3

Summary of Significant Accounting Policies - Schedule of Company's Investment (Details) - USD ($) | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Marketable Securities [Line Items] |  |  |  |  |  |
Total | $ 1,716,691,417 |  | $ 1,794,758,336 |  |  |
Bank Debt |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 1,480,703,553 |  | 1,577,800,543 |  |  |
Other Corporate Debt |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 59,883,928 |  | 64,772,456 |  |  |
Equity Securities |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 176,103,936 |  | 152,185,337 |  |  |
Level 1 |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 809,843 |  | 412,880 |  |  |
Level 1 | Bank Debt |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 0 |  | 0 |  |  |
Level 1 | Other Corporate Debt |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 0 |  | 0 |  |  |
Level 1 | Equity Securities |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 809,843 |  | 412,880 |  |  |
Level 2 |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 5,261,786 |  | 28,557,671 |  |  |
Level 2 | Bank Debt |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 5,261,786 |  | 28,557,671 |  |  |
Level 2 | Other Corporate Debt |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 0 |  | 0 |  |  |
Level 2 | Equity Securities |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 0 |  | 0 |  |  |
Level 3 |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 1,710,619,788 |  | 1,765,787,785 |  |  |
Level 3 | Independent Third-Party Valuation |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 1,709,334,649 | $ 1,773,752,304 | 1,764,630,382 | $ 1,879,087,978 | $ 1,953,070,530 | $ 1,506,246,606
Level 3 | Valuation Designee |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 1,285,139 | $ 1,157,403 | 1,157,403 | $ 1,152,245 | $ 877,248 | $ 844,615
Level 3 | Advisor Valuations |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total |  |  | 1,157,403 |  |  |
Level 3 | Bank Debt | Independent Third-Party Valuation |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 1,475,441,767 |  | 1,549,242,872 |  |  |
Level 3 | Bank Debt | Valuation Designee |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 0 |  |  |  |  |
Level 3 | Bank Debt | Advisor Valuations |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total |  |  | 0 |  |  |
Level 3 | Other Corporate Debt | Independent Third-Party Valuation |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 59,756,438 |  | 64,772,456 |  |  |
Level 3 | Other Corporate Debt | Valuation Designee |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 127,490 |  |  |  |  |
Level 3 | Other Corporate Debt | Advisor Valuations |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total |  |  | 0 |  |  |
Level 3 | Equity Securities | Independent Third-Party Valuation |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | 174,136,444 |  | 150,615,054 |  |  |
Level 3 | Equity Securities | Valuation Designee |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total | $ 1,157,649 |  |  |  |  |
Level 3 | Equity Securities | Advisor Valuations |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Total |  |  | $ 1,157,403 |  |  |

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