Schedule of Investments (Unaudited) - Treasury Bills and Money Market Fund - USD ($)		Mar. 31, 2020		Dec. 31, 2019
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity		102.43%		99.80%
United States Treasury Obligations, Value		$ 97,990,729		$ 77,740,351
Affiliated investments, at value and cost		44,464,517		63,714,072
Investments in Securities, Value		142,455,246		141,454,423
Investments in Securities, Cost		$ 142,437,236		$ 141,436,594
U.S. Treasury Bills, 1.520% due April 2, 2020 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]	36.67%		35.84%	[2]
United States Treasury Obligations, Value	[1]	$ 51,000,014		$ 50,804,047	[2]
United States Treasury Obligations, Principal Value	[1]	$ 51,000,000		$ 51,000,000	[2]
Investment Interest Rate	[1]	1.52%	[3]	1.52%	[2]
Investment Maturity Date	[1]	Apr. 02, 2020	[3]	Apr. 02, 2020	[2]
Restricted for maintenance margin		$ 55,989,500		$ 20,918,100
U.S. Treasury Bills, 1.505% due May 28, 2020 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]	8.63%
United States Treasury Obligations, Value	[1]	$ 11,998,765
United States Treasury Obligations, Principal Value	[1]	$ 12,000,000
Investment Interest Rate	[1]	1.505%
Investment Maturity Date	[1]	May 28, 2020
U.S. Treasury Bills, 0.085% due July 2, 2020 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1],[3]	25.16%
United States Treasury Obligations, Value	[1],[3]	$ 34,991,950
United States Treasury Obligations, Principal Value	[1],[3]	$ 35,000,000
Investment Interest Rate	[1],[3]	0.085%
Investment Maturity Date	[1],[3]	Jul. 02, 2020
United States Treasury Obligations [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]	70.46%		54.85%
United States Treasury Obligations, Value	[1]	$ 97,990,729		$ 77,740,351
Investments in Securities, Cost		$ 97,972,719		$ 77,722,522
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		31.97%	[4]	44.95%	[5]
Affiliated investments, at value and cost		$ 44,464,517	[4]	$ 63,714,072	[5]
Affiliated Investments, Shares		44,464,517	[4]	63,714,072	[5]
Investment Interest Rate		0.54%	[4]	1.47%	[5]
Investments in Securities, Cost		$ 44,464,517	[4]	$ 63,714,072	[5]
U.S. Treasury Bills, 1.520% due February 6, 2020 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]			4.23%
United States Treasury Obligations, Value	[1]			$ 5,991,337
United States Treasury Obligations, Principal Value	[1]			$ 6,000,000
Investment Interest Rate	[1]			1.52%
Investment Maturity Date	[1]			Feb. 06, 2020
U.S. Treasury Bills, 1.560% due March 5, 2020 [Member]
Schedule of Investments [Line Items]
Percentage of Shareholders' Equity	[1]			14.78%
United States Treasury Obligations, Value	[1]			$ 20,944,967
United States Treasury Obligations, Principal Value	[1]			$ 21,000,000
Investment Interest Rate	[1]			1.56%
Investment Maturity Date	[1]			Mar. 05, 2020

[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 $20,918,100 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.

[3] United States Treasury Obligations of $55,989,500 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.

[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 March 31, 2020.

[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, 2019.