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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 99.69% 99.52%
United States Treasury Obligations, Value $ 13,998,617 $ 6,998,350
Affiliated Investments, Value 13,666,188 4,970,177
Investments in Securities, Value 27,664,805 11,968,527
Investments in Securities, Cost $ 27,663,783 $ 11,968,167
U.S. Treasury Bills, 0.070% due August 5, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 14.41%  
United States Treasury Obligations, Value [1] $ 3,999,790  
United States Treasury Obligations, Principal Value [1] $ 4,000,000  
Investment Interest Rate [1] 0.07%  
Investment Maturity Date [1] Aug. 05, 2021  
U.S. Treasury Bills, 0.060% due September 9, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[2] 7.21%  
United States Treasury Obligations, Value [1],[2] $ 1,999,821  
United States Treasury Obligations, Principal Value [1],[2] $ 2,000,000  
Investment Interest Rate [1],[2] 0.06%  
Restricted for maintenance margin $ 1,999,600  
Investment Maturity Date [1],[2] Sep. 09, 2021  
U.S. Treasury Bills, 0.055% due September 16, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 21.62%  
United States Treasury Obligations, Value [1] $ 5,999,398  
United States Treasury Obligations, Principal Value [1] $ 6,000,000  
Investment Interest Rate [1] 0.055%  
Investment Maturity Date [1] Sep. 16, 2021  
U.S. Treasury Bills, 0.135% due November 4, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 7.20%  
United States Treasury Obligations, Value [1] $ 1,999,608  
United States Treasury Obligations, Principal Value [1] $ 2,000,000  
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 50.44% 58.19%
United States Treasury Obligations, Value $ 13,998,617 $ 6,998,350
Investments in Securities, Cost $ 13,997,595 $ 6,997,990
Money Market Mutual Fund [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] | Affiliated Investments [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity 49.25% [3],[4] 41.33%
Affiliated Investments, Value $ 13,666,188 [3],[4] $ 4,970,177
Affiliated Investments, Shares 13,666,188 [3],[4] 4,970,177
Affiliated Investments, at Cost [3] $ 13,666,188 [4] $ 4,970,177 [5]
Investment Interest Rate [3] 0.03% [4] 0.03% [5]
U.S. Treasury Bills, 0.140% due September 9, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[2]   16.62%
United States Treasury Obligations, Value [1],[2]   $ 1,998,946
United States Treasury Obligations, Principal Value [1],[2]   $ 2,000,000
Investment Interest Rate [1],[2]   0.14%
Investment Maturity Date [1],[2]   Sep. 09, 2021
U.S. Treasury Bills, 0.080% due March 11, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[2]   41.57%
United States Treasury Obligations, Value [1],[2]   $ 4,999,404
United States Treasury Obligations, Principal Value [1],[2]   $ 5,000,000
Investment Interest Rate [1],[2]   0.08%
Restricted for maintenance margin   $ 1,999,600
Investment Maturity Date [1],[2]   Mar. 11, 2021
[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 $1,999,600 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] The rate shown is the 7-day SEC standardized yield as of December 31, 2020