Investments in Affiliates -Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Investments in and Advances to Affiliates [Line Items]
Change in Unrealized Appreciation (Depreciation)	$ (64,356)	$ (1,320,328)	$ 3,187	$ (1,372,163)
Dividend Income	4,942,778	1,740,933	13,271,950	1,852,946
Affiliated Investments [Member]
Investments in and Advances to Affiliates [Line Items]
Investment Owned, at Fair Value, Beginning Balance	559,836,326	780,011,295	983,150,588	626,458,758
Purchases at Cost	443,406,329	917,758,776	776,556,009	1,326,583,519
Proceeds from Sales	(687,781,359)	(609,264,637)	(1,444,378,035)	(864,501,443)
Change in Unrealized Appreciation (Depreciation)	(41,916)	23,600	90,818	(11,800)
Investment Owned, at Fair Value, Ending Balance	315,419,380	1,088,529,034	315,419,380	1,088,529,034
Dividend Income	4,942,778	1,740,933	13,271,950	1,852,946
Affiliated Investments [Member] | Exchange-Traded Fund [Member]
Investments in and Advances to Affiliates [Line Items]
Investment Owned, at Fair Value, Beginning Balance	73,723,258	49,819,600	73,590,524	49,855,000
Change in Unrealized Appreciation (Depreciation)	(41,916)	23,600	90,818	(11,800)
Investment Owned, at Fair Value, Ending Balance	73,681,342	49,843,200	73,681,342	49,843,200
Dividend Income	808,028	33,734	1,515,794	36,736
Affiliated Investments [Member] | Money Market Mutual Fund - Invesco Government & Agency Portfolio, Institutional Class [Member]
Investments in and Advances to Affiliates [Line Items]
Investment Owned, at Fair Value, Beginning Balance	486,113,068	730,191,695	909,560,064	576,603,758
Purchases at Cost	443,406,329	917,758,776	776,556,009	1,326,583,519
Proceeds from Sales	(687,781,359)	(609,264,637)	(1,444,378,035)	(864,501,443)
Investment Owned, at Fair Value, Ending Balance	241,738,038	1,038,685,834	241,738,038	1,038,685,834
Dividend Income	$ 4,134,750	$ 1,707,199	$ 11,756,156	$ 1,816,210