Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments In And Advances To Affiliates [Line Items]
Change in Unrealized Appreciation (Depreciation)	$ 12,047	$ 10,323	$ (2,833)
Dividend Income	1,944,661	668,547	10,466
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	68,087,284	31,507,548	53,676,948
Purchases at Cost	105,429,033	160,282,184	84,376,839
Proceeds from Sales	(137,670,144)	(123,702,448)	(106,546,239)
Ending Value	35,846,173	68,087,284	31,507,548
Dividend Income	$ 1,944,661	$ 668,547	$ 10,466