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Investments in Affiliates -Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment Owned, at Fair Value, Beginning Balance |  |  | $ 426,822,433 |
Dividend Income | $ 1,873,948 | $ 2,009,653 | 6,659,666 | $ 7,219,100
Affiliated Investments [Member] | Money Market Mutual Fund - Invesco Government & Agency Portfolio, Institutional Class [Member] |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Investment Owned, at Fair Value, Beginning Balance | 203,374,505 | 243,373,418 | 279,113,690 | 111,534,057
Purchases at Cost | 66,394,889 | 196,908,586 | 639,916,156 | 686,047,529
Proceeds from Sales | (124,810,619) | (320,324,707) | (774,071,071) | (677,624,289)
Investment Owned, at Fair Value, Ending Balance | 144,958,775 | 119,957,297 | 144,958,775 | 119,957,297
Dividend Income | $ 1,873,948 | $ 2,009,653 | $ 6,659,666 | $ 7,219,100

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