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Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Change in Unrealized Appreciation (Depreciation) | $ 105 | $ (8,050) | $ (19,624) | $ (3,528)
Dividend Income | 354,744 | 536,647 | 808,682 | 1,012,389
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value | 32,298,518 | 38,232,956 | 35,846,173 | 68,087,284
Purchases at Cost | 6,562,211 | 22,075,423 | 11,283,353 | 66,446,806
Proceeds from Sales | (15,656,999) | (27,981,827) | (23,925,796) | (102,207,538)
Ending Value | 23,203,730 | 32,326,552 | 23,203,730 | 32,326,552
Dividend Income | $ 354,744 | $ 536,647 | $ 808,682 | $ 1,012,389

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