v3.26.1
Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Investments In And Advances To Affiliates [Line Items]    
Beginning Value $ 195,278,284  
Change in Unrealized Appreciation (Depreciation) 0 $ (23,643)
Ending Value 364,672,568  
Dividend Income 1,908,609 1,521,904
Affiliated Investments [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 195,278,284 155,007,856
Purchases at Cost 218,178,298 68,723,341
Proceeds from Sales (48,732,864) (82,283,418)
Change in Unrealized Appreciation (Depreciation) (51,150) (33,247)
Ending Value 364,672,568 141,414,532
Dividend Income 1,908,609 1,521,904
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 141,238,309 100,993,456
Purchases at Cost 218,178,298 68,723,341
Proceeds from Sales (48,732,864) (82,283,418)
Ending Value 310,683,743 87,433,379
Dividend Income 1,423,078 942,170
Affiliated Investments [Member] | Invesco Short Term Treasury ETF [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 54,039,975 54,014,400
Change in Unrealized Appreciation (Depreciation) (51,150) (33,247)
Ending Value 53,988,825 53,981,153
Dividend Income $ 485,531 $ 579,734