Schedule of Investments - Treasury Bills and Money Market Fund - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 |
Schedule of Investments [Line Items] | | | | | |
Percentage of Shareholders' Equity | | 100.42% | | 103.49% | |
United States Treasury Obligations, Value | | $ 123,646,647 | | $ 409,384,745 | |
Affiliated Investments, Value | | 105,630,007 | | 102,216,801 | |
Investments in Securities, Value | | 229,276,654 | | 511,601,546 | |
Investments in Securities, Cost | | 229,340,530 | | 511,790,491 | |
Restricted for maintenance margin | | $ 8,068,540 | | $ 10,614,400 | |
Affiliated Investments [Member] | | | | | |
Schedule of Investments [Line Items] | | | | | |
Percentage of Shareholders' Equity | | 46.26% | | 20.68% | |
Affiliated Investments, Value | | $ 105,630,007 | | $ 102,216,801 | |
Affiliated Investments, at Cost | | $ 105,742,951 | | $ 102,405,445 | |
US Treasury Bills, 1.520% Due February 6, 2020 [Member] | | | | | |
Schedule of Investments [Line Items] | | | | | |
Percentage of Shareholders' Equity | [1] | 14.87% | | | |
United States Treasury Obligations, Value | [1] | $ 33,950,912 | | | |
United States Treasury Obligations, Principal Value | [1] | $ 34,000,000 | | | |
Investment Interest Rate | [1] | 1.52% | | | |
Investment Maturity Date | [1] | Feb. 6, 2020 | | | |
US Treasury Bills, 1.560% Due March 5, 2020 [Member] | | | | | |
Schedule of Investments [Line Items] | | | | | |
Percentage of Shareholders' Equity | [1],[2] | 14.85% | | | |
United States Treasury Obligations, Value | [1],[2] | $ 33,910,899 | | | |
United States Treasury Obligations, Principal Value | [1],[2] | $ 34,000,000 | | | |
Investment Interest Rate | [1],[2] | 1.56% | | | |
Investment Maturity Date | [1],[2] | Mar. 5, 2020 | | | |
US Treasury Bills, 1.520% Due April 2, 2020 [Member] | | | | | |
Schedule of Investments [Line Items] | | | | | |
Percentage of Shareholders' Equity | [1],[2] | 24.44% | | | |
United States Treasury Obligations, Value | [1],[2] | $ 55,784,836 | | | |
United States Treasury Obligations, Principal Value | [1],[2] | $ 56,000,000 | | | |
Investment Interest Rate | [1],[2] | 1.52% | | | |
Investment Maturity Date | [1],[2] | Apr. 2, 2020 | | | |
United States Treasury Obligations [Member] | | | | | |
Schedule of Investments [Line Items] | | | | | |
Percentage of Shareholders' Equity | [1] | 54.16% | | 82.81% | |
United States Treasury Obligations, Value | [1] | $ 123,646,647 | | $ 409,384,745 | |
Investments in Securities, Cost | | $ 123,597,579 | | $ 409,385,046 | [1] |
Exchange-Traded Fund [Member] | Affiliated Investments [Member] | | | | | |
Schedule of Investments [Line Items] | | | | | |
Percentage of Shareholders' Equity | [3] | 34.99% | | 16.15% | |
Affiliated Investments, Value | [3] | $ 79,893,780 | | $ 79,818,080 | |
Affiliated Investments, Shares | [3] | 757,000 | | 757,000 | |
Affiliated Investments, at Cost | [3] | $ 80,006,724 | | $ 80,006,724 | |
Money Market Mutual Fund - Invesco Premier U.S. Government Money Portfolio - Institutional Class [Member] | Affiliated Investments [Member] | | | | | |
Schedule of Investments [Line Items] | | | | | |
Percentage of Shareholders' Equity | | 11.27% | [4] | 4.53% | [5] |
Affiliated Investments, Value | | $ 25,736,227 | [4] | $ 22,398,721 | [5] |
Affiliated Investments, Shares | | 25,736,227 | [4] | 22,398,721 | [5] |
Investment Interest Rate | | 1.47% | [4] | 2.30% | [5] |
Investments in Securities, Cost | | $ 25,736,227 | [4] | $ 22,398,721 | [5] |
U.S. Treasury Bills, 2.175% due January 3, 2019 [Member] | | | | | |
Schedule of Investments [Line Items] | | | | | |
Percentage of Shareholders' Equity | [1] | | | 24.68% | |
United States Treasury Obligations, Value | [1] | | | $ 121,992,392 | |
United States Treasury Obligations, Principal Value | [1] | | | $ 122,000,000 | |
Investment Interest Rate | [1] | | | 2.175% | |
Investment Maturity Date | [1] | | | Jan. 3, 2019 | |
U.S. Treasury Bills, 2.370% due February 28, 2019 [Member] | | | | | |
Schedule of Investments [Line Items] | | | | | |
Percentage of Shareholders' Equity | [1] | | | 29.02% | |
United States Treasury Obligations, Value | [1] | | | $ 143,458,214 | |
United States Treasury Obligations, Principal Value | [1] | | | $ 144,000,000 | |
Investment Interest Rate | [1] | | | 2.37% | |
Investment Maturity Date | [1] | | | Feb. 28, 2019 | |
U.S. Treasury Bills, 2.465% due April 4, 2019 [Member] | | | | | |
Schedule of Investments [Line Items] | | | | | |
Percentage of Shareholders' Equity | [1] | | | 10.65% | |
United States Treasury Obligations, Value | [1] | | | $ 52,672,055 | |
United States Treasury Obligations, Principal Value | [1] | | | $ 53,000,000 | |
Investment Interest Rate | [1] | | | 2.465% | |
Investment Maturity Date | [1] | | | Apr. 4, 2019 | |
U.S. Treasury Bills, 2.430% due May 2, 2019 [Member] | | | | | |
Schedule of Investments [Line Items] | | | | | |
Percentage of Shareholders' Equity | [1],[6] | | | 18.46% | |
United States Treasury Obligations, Value | [1],[6] | | | $ 91,262,084 | |
United States Treasury Obligations, Principal Value | [1],[6] | | | $ 92,000,000 | |
Investment Interest Rate | [1],[6] | | | 2.43% | |
Investment Maturity Date | [1],[6] | | | May 2, 2019 | |
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[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 $8,068,540 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts. | |
[3] | Affiliated company. The security and the Fund are affiliated by having the same investment adviser. See Note 8. | |
[4] | The security and the Fund are advised by wholly-owned subsidiaries of Invesco Ltd. and are therefore considered to be affiliated. The rate shown is the 7-day SEC standardized yield as of December 31, 2019. | |
[5] | The security and the Fund are advised by wholly-owned subsidiaries of Invesco Ltd. and are therefore considered to be affiliated. The rate shown is the 7-day SEC standardized yield as of December 31, 2018. | |
[6] | United States Treasury Obligations of $10,614,400 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts. | |