Schedule of Investments (Unaudited) - Treasury Bills and Money Market Fund - USD ($)		Mar. 31, 2020		Dec. 31, 2019
Schedule Of Investments [Line Items]
Investments in Securities, cost		$ 35,801,191		$ 50,756,983
Percentage of Shareholders' Equity		99.85%		123.79%
United States Treasury Obligations, Value		$ 23,999,594		$ 28,910,162
Affiliated investments, value		11,811,626		21,851,133
Investments in Securities, Value		$ 35,811,220		$ 50,761,295
U S Treasury Bills One Point Five Two Zero Percentage Due April Two Thousand Twenty
Schedule Of Investments [Line Items]
Investment Interest Rate	[1]	1.52%		1.52%	[2]
Investment Maturity Date	[1]	Apr. 02, 2020		Apr. 02, 2020	[2]
Restricted for maintenance margin		$ 1,110,000		$ 1,105,671
Percentage of Shareholders' Equity	[1]	55.77%	[3]	48.58%	[2]
United States Treasury Obligations, Value	[1]	$ 20,000,006	[3]	$ 19,923,156	[2]
United States Treasury Obligations, Principal Value	[1]	$ 20,000,000	[3]	20,000,000	[2]
U S Treasury Bills One Point Five Zero Five Percentage Due May Two Thousand Twenty
Schedule Of Investments [Line Items]
Investment Interest Rate	[1]	1.505%
Investment Maturity Date	[1]	May 28, 2020
Percentage of Shareholders' Equity	[1]	11.15%
United States Treasury Obligations, Value	[1]	$ 3,999,588
United States Treasury Obligations, Principal Value	[1]	4,000,000
United States Treasury Obligations [Member]
Schedule Of Investments [Line Items]
Investments in Securities, cost	[1]	$ 23,989,565		$ 28,905,850
Percentage of Shareholders' Equity	[1]	66.92%		70.50%
United States Treasury Obligations, Value	[1]	$ 23,999,594		$ 28,910,162
Money Market Mutual Fund - Invesco Premier U.S. Government Money Portfolio - Institutional Class [Member] | Affiliated Investments [Member]
Schedule Of Investments [Line Items]
Investment Interest Rate		0.54%	[4]	1.47%	[5]
Investments in Securities, cost		$ 11,811,626	[4]	$ 21,851,133	[5]
Percentage of Shareholders' Equity		32.93%	[4]	53.29%	[5]
Affiliated investments, value		$ 11,811,626	[4]	$ 21,851,133	[5]
Shares		11,811,626	[4]	21,851,133	[5]
U.S. Treasury Bills, 1.520% due February 6, 2020 [Member]
Schedule Of Investments [Line Items]
Investment Interest Rate	[1]			1.52%
Investment Maturity Date	[1]			Feb. 06, 2020
Percentage of Shareholders' Equity	[1]			21.92%
United States Treasury Obligations, Value	[1]			$ 8,987,006
United States Treasury Obligations, Principal Value	[1]			$ 9,000,000

[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 $1,105,671 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.

[3] United States Treasury Obligations of $1,110,000 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.