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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 81.26% 78.08%
United States Treasury Obligations, Value $ 116,991,962 $ 65,983,080
Affiliated investments, Value 121,426,865 69,754,530
Investments in Securities, Value 238,418,827 135,737,610
Investments in Securities, cost $ 238,356,574 $ 135,688,386
Affiliated Investments [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity 41.38% 40.12%
Affiliated investments, Value $ 121,426,865 $ 69,754,530
Affiliated Investments, Cost $ 121,379,684 $ 69,709,628
U.S. Treasury Bills, 0.045% due June 10, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 3.41%  
United States Treasury Obligations, Value [1] $ 9,999,776  
United States Treasury Obligations, Principal Value [1] $ 10,000,000  
Investment Interest Rate [1] 0.045%  
Investment Maturity Date [1] Jun. 10, 2021  
U.S. Treasury Bills, 0.070% due August 5, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[2] 14.66%  
United States Treasury Obligations, Value [1],[2] $ 42,997,743  
United States Treasury Obligations, Principal Value [1],[2] $ 43,000,000  
Investment Interest Rate [1],[2] 0.07%  
Investment Maturity Date [1],[2] Aug. 05, 2021  
U.S. Treasury Bills, 0.050% due August 12, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 9.20%  
United States Treasury Obligations, Value [1] $ 26,998,105  
United States Treasury Obligations, Principal Value [1] $ 27,000,000  
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] 9.20%  
United States Treasury Obligations, Value [1],[2] $ 26,997,585  
United States Treasury Obligations, Principal Value [1],[2] $ 27,000,000  
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] 3.41%  
United States Treasury Obligations, Value [1] $ 9,998,753  
United States Treasury Obligations, Principal Value [1] $ 10,000,000  
Investment Interest Rate [1] 0.035%  
Investment Maturity Date [1] Oct. 07, 2021  
United States Treasury Obligations [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 39.88% 37.96%
United States Treasury Obligations, Value [1] $ 116,991,962 $ 65,983,080
Investments in Securities, cost [1] $ 116,976,890 $ 65,978,758
Exchange-Traded Fund [Member] | Affiliated Investments [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [3] 5.47% 9.23%
Affiliated investments, Value [3] $ 16,053,552 $ 16,051,273
Affiliated Investments, Shares [3] 151,900 151,900
Affiliated Investments, Cost [3] $ 16,006,371 $ 16,006,371
Money Market Funds [Member] | Invesco Government and Agency Portfolio Institutional Class [Member] | Affiliated Investments [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity 35.91% [3],[4] 30.89%
Affiliated investments, Value $ 105,373,313 [3],[4] $ 53,703,257
Affiliated Investments, Shares 105,373,313 [3],[4] 53,703,257
Investment Interest Rate [3] 0.03% [4] 0.03% [5]
Affiliated Investments, Cost [3] $ 105,373,313 [4] $ 53,703,257 [5]
U.S. Treasury Bills, 0.070% due August 5, 2021 [Member]    
Schedule Of Investments [Line Items]    
Restricted for maintenance margin $ 19,997,300  
U.S. Treasury Bills, 0.140% due October 7, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1]   5.75%
United States Treasury Obligations, Value [1]   $ 9,993,867
United States Treasury Obligations, Principal Value [1]   $ 10,000,000
Investment Interest Rate [1]   0.14%
Investment Maturity Date [1]   Oct. 07, 2021
U.S. Treasury Bills, 0.085% due February 25, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[6]   11.50%
United States Treasury Obligations, Value [1],[6]   $ 19,998,339
United States Treasury Obligations, Principal Value [1],[6]   $ 20,000,000
Investment Interest Rate [1],[6]   0.085%
Investment Maturity Date [1],[6]   Feb. 25, 2021
Restricted for maintenance margin   $ 19,998,000
U.S. Treasury Bills, 0.080% due March 11, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1]   10.93%
United States Treasury Obligations, Value [1]   $ 18,997,736
United States Treasury Obligations, Principal Value [1]   $ 19,000,000
Investment Interest Rate [1],[6]   0.08%
Investment Maturity Date [1],[6]   Mar. 11, 2021
U.S. Treasury Bills, 0.090% due June 10, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1]   5.75%
United States Treasury Obligations, Value [1]   $ 9,996,827
United States Treasury Obligations, Principal Value [1]   $ 10,000,000
Investment Interest Rate [1]   0.09%
Investment Maturity Date [1]   Jun. 10, 2021
U.S. Treasury Bills, 0.140% due September 9, 2021 [Member]    
Schedule Of Investments [Line Items]    
Percentage of Shareholders' Equity [1]   4.03%
United States Treasury Obligations, Value [1]   $ 6,996,311
United States Treasury Obligations, Principal Value [1]   $ 7,000,000
Investment Interest Rate [1]   0.14%
Investment Maturity Date [1]   Sep. 09, 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 $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] The rate shown is the 7-day SEC standardized yield as of December 31, 2020.
[6] United States Treasury Obligations of $19,998,000 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.