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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value |  |  | $ 208,478,795 |
Change in Unrealized Appreciation (Depreciation) | $ (148) | $ 711 | (23,791) | $ (53,454)
Ending Value | 206,593,618 |  | 206,593,618 |
Dividend Income | 1,799,755 | 2,292,399 | 3,321,659 | 4,455,656
Affiliated Investments [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value | 141,414,532 | 165,260,784 | 155,007,856 | 162,850,666
Purchases at Cost | 98,646,053 | 77,473,575 | 167,369,394 | 162,773,691
Proceeds from Sales | (33,469,524) | (74,717,576) | (115,752,942) | (157,538,522)
Change in Unrealized Appreciation (Depreciation) | 2,557 |  | (30,690) | (69,052)
Ending Value | 206,593,618 | 168,016,783 | 206,593,618 | 168,016,783
Dividend Income | 1,799,755 | 2,292,399 | 3,321,659 | 4,455,656
Affiliated Investments [Member] | Money Market Mutual Fund - Invesco Government and Agency Portfolio - Institutional Class [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value | 87,433,379 | 111,312,879 | 100,993,456 | 108,833,709
Purchases at Cost | 98,646,053 | 77,473,575 | 167,369,394 | 162,773,691
Proceeds from Sales | (33,469,524) | (74,717,576) | (115,752,942) | (157,538,522)
Ending Value | 152,609,908 | 114,068,878 | 152,609,908 | 114,068,878
Dividend Income | 1,260,082 | 1,620,697 | 2,202,252 | 3,090,140
Affiliated Investments [Member] | Invesco Short Term Treasury ETF [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value | 53,981,153 | 53,947,905 | 54,014,400 | 54,016,957
Change in Unrealized Appreciation (Depreciation) | 2,557 |  | (30,690) | (69,052)
Ending Value | 53,983,710 | 53,947,905 | 53,983,710 | 53,947,905
Dividend Income | $ 539,673 | $ 671,702 | $ 1,119,407 | $ 1,365,516

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