v3.25.1
Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Excluding Affiliated Money Market Funds) (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Investments In And Advances To Affiliates [Line Items]    
Beginning Value $ 100,657,602  
Change in Unrealized Appreciation (Depreciation) (38,379) $ (43,462)
Ending Value 98,052,507  
Dividend Income 499,956 714,136
Affiliated Investments [Member]    
Investments In And Advances To Affiliates [Line Items]    
Purchases at Cost   10,034,229
Proceeds from Sales   (4,615,312)
Change in Unrealized Appreciation (Depreciation)   (25,623)
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member]    
Investments In And Advances To Affiliates [Line Items]    
Purchases at Cost 13,256,204 10,034,229
Proceeds from Sales (16,363,721) (4,615,312)
Affiliated Investments [Member] | Exchange-Traded Fund [Member]    
Investments In And Advances To Affiliates [Line Items]    
Change in Unrealized Appreciation (Depreciation)   (25,623)
Affiliated Investments [Member] | Investment Affiliated [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value   53,345,835
Ending Value   58,739,129
Dividend Income   714,136
Affiliated Investments [Member] | Investment Affiliated [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 51,500,959 33,302,006
Ending Value 48,393,442 38,720,923
Dividend Income $ 499,956 456,686
Affiliated Investments [Member] | Investment Affiliated [Member] | Exchange-Traded Fund [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value   20,043,829
Ending Value   20,018,206
Dividend Income   $ 257,450