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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] |  |  |  |
Beginning Value |  |  | $ 51,168,499 |
Change in Unrealized Appreciation (Depreciation) | $ 0 | $ 18,728 | (7,554) | $ (896)
Dividend Income | 1,492,967 | 329,188 | 3,194,468 | 1,137,870
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value | 137,560,960 | 23,203,730 | 36,311,736 | 35,846,173
Purchases at Cost | 16,481,585 | 15,760,068 | 127,376,530 | 27,043,421
Proceeds from Sales | (6,809,489) | (5,213,712) | (16,455,210) | (29,139,508)
Ending Value | 147,233,056 | 33,750,086 | 147,233,056 | 33,750,086
Dividend Income | $ 1,492,967 | $ 329,188 | $ 3,194,468 | $ 1,137,870

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