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Condensed Schedule of Investments [Parenthetical]	3 Months Ended
	Mar. 31, 2019 USD ($)
Collateral amount on open futures contracts	$ 10,220,823
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.37%, 4/04/2019
Interest rate	2.37%
Expiration date	4/04/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.41%, 4/11/2019
Interest rate	2.41%
Expiration date	4/11/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.42%, 4/18/2019
Interest rate	2.42%
Expiration date	4/18/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.43%, 4/25/2019
Interest rate	2.43%
Expiration date	4/25/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.46%, 5/02/2019
Interest rate	2.46%
Expiration date	5/02/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.47%, 5/09/2019
Interest rate	2.47%
Expiration date	5/09/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.48%, 5/16/2019
Interest rate	2.48%
Expiration date	5/16/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.50%, 5/23/2019
Interest rate	2.50%
Expiration date	5/23/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.49%, 5/30/2019
Interest rate	2.49%
Expiration date	5/30/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.51%, 6/06/2019
Interest rate	2.51%
Expiration date	6/06/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.51%, 6/13/2019
Interest rate	2.51%
Expiration date	6/13/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.49%, 6/20/2019
Interest rate	2.49%
Expiration date	6/20/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.49%, 6/27/2019
Interest rate	2.49%
Expiration date	6/27/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.47%, 7/05/2019
Interest rate	2.47%
Expiration date	7/05/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.48%, 7/11/2019
Interest rate	2.48%
Expiration date	7/11/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.47%, 7/18/2019
Interest rate	2.47%
Expiration date	7/18/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.47%, 7/25/2019
Interest rate	2.47%
Expiration date	7/25/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.48%, 8/01/2019
Interest rate	2.48%
Expiration date	8/01/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.46%, 8/08/2019
Interest rate	2.46%
Expiration date	8/08/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.47%, 8/15/2019
Interest rate	2.47%
Expiration date	8/15/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.47%, 8/22/2019
Interest rate	2.47%
Expiration date	8/22/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.48%, 8/29/2019
Interest rate	2.48%
Expiration date	8/29/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.48%, 9/05/2019
Interest rate	2.48%
Expiration date	9/05/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.48%, 9/12/2019
Interest rate	2.48%
Expiration date	9/12/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.46%, 9/19/2019
Interest rate	2.46%
Expiration date	9/19/2019
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.41%, 9/26/2019
Interest rate	2.41%
Expiration date	9/26/2019

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Amount of assets pledged to secure a debt instrument.

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