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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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