v3.26.1
Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Schedule of Investments [Line Items]        
Beginning Value     $ 145,567,003  
Change in Unrealized Appreciation (Depreciation) $ 0 $ (15,332) 0 $ (57,550)
Ending Value 221,645,895   221,645,895  
Dividend Income 2,136,787 1,218,790 3,537,193 2,167,778
Investment, Affiliated Issuer [Member]        
Schedule of Investments [Line Items]        
Beginning Value     145,567,003  
Ending Value 221,645,895   221,645,895  
Affiliated Investments [Member]        
Schedule of Investments [Line Items]        
Purchases at Cost 109,397,279 63,141,107 213,855,527 113,479,161
Proceeds from Sales (116,465,424) (32,405,621) (137,760,323) (64,033,539)
Change in Unrealized Appreciation (Depreciation) 4,078 1,019 (16,312) (12,234)
Affiliated Investments [Member] | Exchange Traded Funds [Member]        
Schedule of Investments [Line Items]        
Change in Unrealized Appreciation (Depreciation) 4,078 1,019 (16,312) (12,234)
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member]        
Schedule of Investments [Line Items]        
Purchases at Cost 109,397,279 63,141,107 213,855,527 113,479,161
Proceeds from Sales (116,465,424) (32,405,621) (137,760,323) (64,033,539)
Affiliated Investments [Member] | Investment, Affiliated Issuer [Member]        
Schedule of Investments [Line Items]        
Beginning Value 228,709,962 118,931,634 145,567,003 100,234,751
Ending Value 221,645,895 149,668,139 221,645,895 149,668,139
Dividend Income 2,136,787 1,218,790 3,537,193 2,167,778
Affiliated Investments [Member] | Investment, Affiliated Issuer [Member] | Exchange Traded Funds [Member]        
Schedule of Investments [Line Items]        
Beginning Value 21,521,645 21,518,587 21,542,035 21,531,840
Ending Value 21,525,723 21,519,606 21,525,723 21,519,606
Dividend Income 183,699 215,131 377,246 446,231
Affiliated Investments [Member] | Investment, Affiliated Issuer [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member]        
Schedule of Investments [Line Items]        
Beginning Value 207,188,317 97,413,047 124,024,968 78,702,911
Ending Value 200,120,172 128,148,533 200,120,172 128,148,533
Dividend Income $ 1,953,088 $ 1,003,659 $ 3,159,947 $ 1,721,547