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Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Investments In And Advances To Affiliates [Line Items]    
Beginning Value $ 79,239,151  
Change in Unrealized Appreciation (Depreciation) (6,125) $ 1,471
Ending Value 109,733,307  
Exchange Traded Funds [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value [1] 11,439,187  
Ending Value [2] 11,431,065  
Affiliated Investments [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 79,239,151 86,041,269
Purchases at Cost 67,114,679 44,122,366
Proceeds from Sales (36,612,401) (59,007,696)
Change in Unrealized Appreciation (Depreciation) (8,122) 2,475
Ending Value 109,733,307 71,158,414
Dividend Income 15,175 6,905
Affiliated Investments [Member] | Money Market Funds [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 67,799,964  
Purchases at Cost 67,114,679  
Proceeds from Sales (36,612,401)  
Ending Value 98,302,242  
Dividend Income 14,486  
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   68,605,719
Purchases at Cost   44,122,366
Proceeds from Sales   (59,007,696)
Ending Value   53,720,389
Dividend Income   4,311
Affiliated Investments [Member] | Exchange Traded Funds [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 11,439,187 17,435,550
Change in Unrealized Appreciation (Depreciation) (8,122) 2,475
Ending Value 11,431,065 17,438,025
Dividend Income $ 689 $ 2,594
[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.
[2] 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