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Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Investments In And Advances To Affiliates [Line Items] |  |  |
Beginning Value | $ 148,120,840 |  |
Change in Unrealized Appreciation (Depreciation) | (863) | $ 47,154 | $ 12,095
Ending Value | 154,307,059 | 148,120,840 |
Dividend Income | 5,184,488 | 4,909,542 | 814,462
Investment, Affiliated Issuer [Member] |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |
Beginning Value | 94,268,880 |  |
Ending Value | 100,234,751 | 94,268,880 |
Affiliated Investments [Member] |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |
Purchases at Cost | 229,512,657 | 271,278,306 | 234,859,721
Proceeds from Sales | (223,545,766) | (246,563,115) | (244,587,227)
Change in Unrealized Appreciation (Depreciation) | (1,020) | 54,034 | 13,199
Realized Gain (Loss) |  |  | (25,189)
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |
Purchases at Cost | 229,512,657 | 271,278,306 | 219,809,829
Proceeds from Sales | (223,545,766) | (246,563,115) | (239,588,964)
Affiliated Investments [Member] | Exchange Traded Funds [Member] |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |
Purchases at Cost |  |  | 15,049,892
Proceeds from Sales |  |  | (4,998,263)
Change in Unrealized Appreciation (Depreciation) | (1,020) | 54,034 | 13,199
Realized Gain (Loss) |  |  | (25,189)
Affiliated Investments [Member] | Investment, Affiliated Issuer [Member] |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |
Beginning Value | 94,268,880 | 69,499,655 | 79,239,151
Ending Value | 100,234,751 | 94,268,880 | 69,499,655
Dividend Income | 5,184,488 | 4,909,542 | 814,462
Affiliated Investments [Member] | Investment, Affiliated Issuer [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |
Beginning Value | 72,736,020 | 48,020,829 | 67,799,964
Ending Value | 78,702,911 | 72,736,020 | 48,020,829
Dividend Income | 4,110,402 | 3,912,473 | 715,870
Affiliated Investments [Member] | Investment, Affiliated Issuer [Member] | Exchange Traded Funds [Member] |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |
Beginning Value | 21,532,860 | 21,478,826 | 11,439,187
Ending Value | 21,531,840 | 21,532,860 | 21,478,826
Dividend Income | $ 1,074,086 | $ 997,069 | $ 98,592

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