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Condensed Schedule of Investments (Parenthetical)	6 Months Ended
	Jun. 30, 2018 USD ($)
Collateral Amount on Open Futures Contracts	$ 537,949
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.56%, 7/05/2018 [Member]
Expiration date	7/05/2018
Interest Rate	1.56%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.56%, 7/12/2018 [Member]
Expiration date	7/12/2018
Interest Rate	1.56%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.60%, 7/19/2018 [Member]
Expiration date	7/19/2018
Interest Rate	1.60%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:1.61%, 7/26/2018 [Member]
Expiration date	7/26/2018
Interest Rate	1.61%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.63%, 8/02/2018 [Member]
Expiration date	8/02/2018
Interest Rate	1.63%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.71%, 8/09/2018 [Member]
Expiration date	8/09/2018
Interest Rate	1.71%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.77%, 8/16/2018 [Member]
Expiration date	8/16/2018
Interest Rate	1.77%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.82%, 8/23/2018 [Member]
Expiration date	8/23/2018
Interest Rate	1.82%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.82%, 8/30/2018 [Member]
Expiration date	8/30/2018
Interest Rate	1.82%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.85%, 9/06/2018 [Member]
Expiration date	9/06/2018
Interest Rate	1.85%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.90%, 9/13/2018 [Member]
Expiration date	9/13/2018
Interest Rate	1.90%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.92%, 9/20/2018 [Member]
Expiration date	9/20/2018
Interest Rate	1.92%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.90%, 9/27/2018 [Member]
Expiration date	9/27/2018
Interest Rate	1.90%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.87%, 10/04/2018 [Member]
Expiration date	10/04/2018
Interest Rate	1.87%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.97%, 10/18/2018 [Member]
Expiration date	10/18/2018
Interest Rate	1.97%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.00%, 10/25/2018 [Member]
Expiration date	10/25/2018
Interest Rate	2.00%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.00%, 11/01/2018 [Member]
Expiration date	11/01/2018
Interest Rate	2.00%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.03%, 11/08/2018 [Member]
Expiration date	11/08/2018
Interest Rate	2.03%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.05%, 11/15/2018 [Member]
Expiration date	11/15/2018
Interest Rate	2.05%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.07%, 11/23/2018 [Member]
Expiration date	11/23/2018
Interest Rate	2.07%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.05%, 11/29/2018 [Member]
Expiration date	11/29/2018
Interest Rate	2.05%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.09%, 12/06/2018 [Member]
Expiration date	12/06/2018
Interest Rate	2.09%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills:2.06%, 12/13/2018 [Member]
Expiration date	12/13/2018
Interest Rate	2.06%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.09%, 12/20/2018 [Member]
Expiration date	12/20/2018
Interest Rate	2.09%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.07%, 12/27/2018 [Member]
Expiration date	12/27/2018
Interest Rate	2.07%

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Amount of assets pledged to secure a debt instrument.

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