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v3.25.4

Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Investments In And Advances To Affiliates [Line Items] |  |  |
Beginning Value | $ 51,168,499 |  |
Change in Unrealized Appreciation (Depreciation) | (7,554) | $ (15,152) | $ 12,047
Ending Value |  | 51,168,499 |
Dividend Income | 4,573,297 | 1,585,659 | 1,944,661
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |
Beginning Value | 36,311,736 | 35,846,173 | 68,087,284
Purchases at Cost | 132,560,246 | 50,056,201 | 105,429,033
Proceeds from Sales | (37,426,367) | (49,590,638) | (137,670,144)
Ending Value | 131,445,615 | 36,311,736 | 35,846,173
Dividend Income | $ 4,573,297 | $ 1,585,659 | $ 1,944,661

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