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Condensed Schedule of Investments [Parenthetical]	6 Months Ended
	Jun. 30, 2018 USD ($)
Collateral amount on open futures contracts	$ 8,492,982	[1]
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.56%, 7/05/2018
Interest rate	1.56%
Expiration date	7/05/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.56%, 7/12/2018
Interest rate	1.56%
Expiration date	7/12/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.60%, 7/19/2018
Interest rate	1.60%
Expiration date	7/19/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.61%, 7/26/2018
Interest rate	1.61%
Expiration date	7/26/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.63%, 8/02/2018
Interest rate	1.63%
Expiration date	8/02/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.71%, 8/09/2018
Interest rate	1.71%
Expiration date	8/09/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.77%, 8/16/2018
Interest rate	1.77%
Expiration date	8/16/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.82%, 8/23/2018
Interest rate	1.82%
Expiration date	8/23/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.82%, 8/30/2018
Interest rate	1.82%
Expiration date	8/30/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.85%, 9/06/2018
Interest rate	1.85%
Expiration date	9/06/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.90%, 9/13/2018
Interest rate	1.90%
Expiration date	9/13/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.92%, 9/20/2018
Interest rate	1.92%
Expiration date	9/20/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.90%, 9/27/2018
Interest rate	1.90%
Expiration date	9/27/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.87%, 10/04/2018
Interest rate	1.87%
Expiration date	10/04/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.90%, 10/11/2018
Interest rate	1.90%
Expiration date	10/11/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,1.97%, 10/18/2018
Interest rate	1.97%
Expiration date	10/18/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.00%, 10/25/2018
Interest rate	2.00%
Expiration date	10/25/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.00%, 11/01/2018
Interest rate	2.00%
Expiration date	11/01/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.03%, 11/08/2018
Interest rate	2.03%
Expiration date	11/08/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.05%, 11/15/2018
Interest rate	2.05%
Expiration date	11/15/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.07%, 11/23/2018
Interest rate	2.07%
Expiration date	11/23/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.05%, 11/29/2018
Interest rate	2.05%
Expiration date	11/29/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.09%, 12/06/2018
Interest rate	2.09%
Expiration date	12/06/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.06%, 12/13/2018
Interest rate	2.06%
Expiration date	12/13/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.09%, 12/20/2018
Interest rate	2.09%
Expiration date	12/20/2018
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Securities [Member] | U.S. Treasury Bills,2.07%, 12/27/2018
Interest rate	2.07%
Expiration date	12/27/2018
[1] Collateral amounted to $8,492,982 on open futures contracts.

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