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Condensed Schedule of Investments (Parenthetical)	6 Months Ended
	Jun. 30, 2019 USD ($)
Collateral Amount on Open Futures Contracts	$ 1,098,128
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.47%, 7/05/2019 [Member]
Expiration date	7/05/2019
Interest Rate	2.47%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.48%, 7/11/2019 [Member]
Expiration date	7/11/2019
Interest Rate	2.48%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.47%, 7/18/2019 [Member]
Expiration date	7/18/2019
Interest Rate	2.47%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.47%, 7/25/2019 [Member]
Expiration date	7/25/2019
Interest Rate	2.47%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.48%, 8/01/2019 [Member]
Expiration date	8/01/2019
Interest Rate	2.48%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.46%, 8/08/2019 [Member]
Expiration date	8/08/2019
Interest Rate	2.46%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.47%, 8/15/2019 [Member]
Expiration date	8/15/2019
Interest Rate	2.47%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.47%, 8/22/2019 [Member]
Expiration date	8/22/2019
Interest Rate	2.47%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.48%, 8/29/2019 [Member]
Expiration date	8/29/2019
Interest Rate	2.48%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.48%, 9/05/2019 [Member]
Expiration date	9/05/2019
Interest Rate	2.48%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.48%, 9/12/2019 [Member]
Expiration date	9/12/2019
Interest Rate	2.48%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.46%, 9/19/2019 [Member]
Expiration date	9/19/2019
Interest Rate	2.46%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.41%, 9/26/2019 [Member]
Expiration date	9/26/2019
Interest Rate	2.41%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.40%, 10/03/2019 [Member]
Expiration date	10/03/2019
Interest Rate	2.40%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.41%, 10/10/2019 [Member]
Expiration date	10/10/2019
Interest Rate	2.41%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.42%, 10/17/2019 [Member]
Expiration date	10/17/2019
Interest Rate	2.42%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.40%, 10/24/2019 [Member]
Expiration date	10/24/2019
Interest Rate	2.40%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.37%, 10/31/2019 [Member]
Expiration date	10/31/2019
Interest Rate	2.37%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.40%, 11/07/2019 [Member]
Expiration date	11/07/2019
Interest Rate	2.40%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.38%, 11/14/2019 [Member]
Expiration date	11/14/2019
Interest Rate	2.38%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.37%, 11/21/2019 [Member]
Expiration date	11/21/2019
Interest Rate	2.37%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.33%, 11/29/2019 [Member]
Expiration date	11/29/2019
Interest Rate	2.33%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.20%, 12/05/2019[Member]
Expiration date	12/05/2019
Interest Rate	2.20%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.16%, 12/12/2019 [Member]
Expiration date	12/12/2019
Interest Rate	2.16%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.15%, 12/19/2019 [Member]
Expiration date	12/19/2019
Interest Rate	2.15%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.07%, 12/26/2019 [Member]
Expiration date	12/26/2019
Interest Rate	2.07%

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