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Schedule of Investments (Unaudited) - Treasury Bills and Money Market Fund - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity 100.15% 99.78%
United States Treasury Obligations, Value $ 144,985,274 $ 119,984,182
Affiliated Investments, Value 232,267,665 245,409,996
Investments in Securities, Value 377,252,939 365,394,178
Investments in Securities, Cost 377,233,646 365,396,641
Restricted for maintenance margin $ 19,997,300 $ 29,997,000
Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity 61.66% 67.02%
Affiliated Investments, Value $ 232,267,665 $ 245,409,996
Affiliated Investments, at Cost $ 232,269,647 $ 245,419,058
U.S. Treasury Bills, 0.070% due August 5, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 9.03%  
United States Treasury Obligations, Value [1] $ 33,998,215  
United States Treasury Obligations, Principal Value [1] $ 34,000,000  
Investment Interest Rate [1] 0.07%  
Investment Maturity Date [1] Aug. 05, 2021  
U.S. Treasury Bills, 0.050% due August 12, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 5.84%  
United States Treasury Obligations, Value [1] $ 21,998,456  
United States Treasury Obligations, Principal Value [1] $ 22,000,000  
Investment Interest Rate [1] 0.05%  
Investment Maturity Date [1] Aug. 12, 2021  
U.S. Treasury Bills, 0.060% due September 9, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[2] 11.15%  
United States Treasury Obligations, Value [1],[2] $ 41,996,244  
United States Treasury Obligations, Principal Value [1],[2] $ 42,000,000  
Investment Interest Rate [1],[2] 0.06%  
Investment Maturity Date [1],[2] Sep. 09, 2021  
U.S. Treasury Bills, 0.035% due October 7, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 5.84%  
United States Treasury Obligations, Value [1] $ 21,997,257  
United States Treasury Obligations, Principal Value [1] $ 22,000,000  
Investment Interest Rate [1] 0.035%  
Investment Maturity Date [1] Oct. 07, 2021  
U.S. Treasury Bills, 0.135% due November 4, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 6.63%  
United States Treasury Obligations, Value [1] $ 24,995,102  
United States Treasury Obligations, Principal Value [1] $ 25,000,000  
Investment Interest Rate [1] 0.135%  
Investment Maturity Date [1] Nov. 04, 2021  
United States Treasury Obligations [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity 38.49% 32.76% [1]
United States Treasury Obligations, Value $ 144,985,274 $ 119,984,182 [1]
Investments in Securities, Cost $ 144,963,999 $ 119,977,583
Exchange-Traded Fund [Member] | Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [3] 13.24% 13.62%
Affiliated Investments, Value [3] $ 49,883,320 $ 49,876,240
Affiliated Investments, Shares [3] 472,000 472,000
Affiliated Investments, at Cost [3] $ 49,885,302 $ 49,885,302
Money Market Mutual Fund - Invesco Government & Agency Portfolio, Institutional Class [Member] | Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [3],[4] 48.42%  
Affiliated Investments, Value [3],[4] $ 182,384,345  
Affiliated Investments, Shares [3],[4] 182,384,345  
Investment Interest Rate [3],[4] 0.03%  
Investments in Securities, Cost [3],[4] $ 182,384,345  
US Treasury Bills, 0.085% Due February 11, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1]   27.30%
United States Treasury Obligations, Value [1]   $ 99,994,722
United States Treasury Obligations, Principal Value [1]   $ 100,000,000
Investment Interest Rate   0.085%
Investment Maturity Date   Feb. 11, 2021
US Treasury Bills, 0.140% Due September 9, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[5]   5.46%
United States Treasury Obligations, Value [1],[5]   $ 19,989,460
United States Treasury Obligations, Principal Value [1],[5]   $ 20,000,000
Investment Interest Rate [5]   0.14%
Investment Maturity Date [5]   Sep. 09, 2021
Money Market Mutual Fund - Invesco Premier U.S. Government Money ETF - Institutional Class [Member] | Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [3],[6]   53.40%
Affiliated Investments, Value [3],[6]   $ 195,533,756
Affiliated Investments, Shares [3],[6]   195,533,756
Investment Interest Rate [3],[6]   0.03%
Investments in Securities, Cost [3],[6]   $ 195,533,756
[1] Security may be traded on a discount basis. The interest rate shown represents the discount rate at the most recent auction date of the security prior to period end.
[2] United States Treasury Obligations of $19,997,300 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.
[3] 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.
[4] The rate shown is the 7-day SEC standardized yield as of March 31, 2021.
[5] United States Treasury Obligations of $29,997,000 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.
[6] The rate shown is the 7-day SEC standardized yield as of December 31, 2020.