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Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Investments In And Advances To Affiliates [Line Items]    
Beginning Value $ 163,597,696  
Change in Unrealized Appreciation (Depreciation) 14,841 $ (29,001)
Ending Value 171,019,668  
Affiliated Investments [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 163,597,696 317,739,851
Purchases at Cost 175,804,388 208,965,190
Proceeds from Sales (168,418,478) (120,713,201)
Change in Unrealized Appreciation (Depreciation) 36,062 (25,613)
Ending Value 171,019,668 405,966,227
Dividend Income 1,935,363 61,100
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 143,604,164 281,668,913
Purchases at Cost 175,804,388 208,965,190
Proceeds from Sales (168,418,478) (120,713,201)
Ending Value 150,990,074 369,920,902
Dividend Income 1,743,073 58,928
Affiliated Investments [Member] | Exchange-Traded Fund [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 19,993,532 [1] 36,070,938
Change in Unrealized Appreciation (Depreciation) 36,062 (25,613)
Ending Value 20,029,594 [1] 36,045,325
Dividend Income $ 192,290 $ 2,172
[1] Affiliated issuer. The issuer and/or the Fund is a wholly-owned subsidiary of Invesco Ltd., or is affiliated by having an investment adviser that is under common control of Invesco Ltd. See Note 8.