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Condensed Schedule of Investments (Parenthetical)	6 Months Ended
	Jun. 30, 2018 USD ($)
Collateral Amount On Open Futures Contracts	$ 124,439,236
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.56%, 7/05/2018 [Member]
Interest rate	1.56%
Expiration date	7/05/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.56%, 7/12/2018[Member]
Interest rate	1.56%
Expiration date	7/12/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.60%, 7/19/2018[Member]
Interest rate	1.60%
Expiration date	7/19/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.61%, 7/26/2018[Member]
Interest rate	1.61%
Expiration date	7/26/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.63%, 8/02/2018[Member]
Interest rate	1.63%
Expiration date	8/02/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.71%, 8/09/2018[Member]
Interest rate	1.71%
Expiration date	8/09/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.77%, 8/16/2018[Member]
Interest rate	1.77%
Expiration date	8/16/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.82%, 8/23/2018[Member]
Interest rate	1.82%
Expiration date	8/23/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.82%, 8/30/2018[Member]
Interest rate	1.82%
Expiration date	8/30/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.85%, 9/06/2018[Member]
Interest rate	1.85%
Expiration date	9/06/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.90%, 9/13/2018[Member]
Interest rate	1.90%
Expiration date	9/13/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.92%, 9/20/2018[Member]
Interest rate	1.92%
Expiration date	9/20/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.90%, 9/27/2018[Member]
Interest rate	1.90%
Expiration date	9/27/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.87%,10/04/2018 [Member]
Interest rate	1.87%
Expiration date	10/04/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.90%, 10/11/2018 [Member]
Interest rate	1.90%
Expiration date	10/11/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.97%, 10/18/2018 [Member]
Interest rate	1.97%
Expiration date	10/18/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.00%, 10/25/2018 [Member]
Interest rate	2.00%
Expiration date	10/25/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.00%, 11/01/2018 [Member]
Interest rate	2.00%
Expiration date	11/01/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.03%, 11/08/2018 [Member]
Interest rate	2.03%
Expiration date	11/08/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.05%, 11/15/2018 [Member]
Interest rate	2.05%
Expiration date	11/15/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.07%, 11/23/2018 [Member]
Interest rate	2.07%
Expiration date	11/23/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.05%, 11/29/2018 [Member]
Interest rate	2.05%
Expiration date	11/29/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.09%, 12/06/2018 [Member]
Interest rate	2.09%
Expiration date	12/06/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.06%, 12/13/2018 [Member]
Interest rate	2.06%
Expiration date	12/13/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.09%, 12/20/2018 [Member]
Interest rate	2.09%
Expiration date	12/20/2018
Cash Equivalents [Member] | United States [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.07%, 12/27/2018 [Member]
Interest rate	2.07%
Expiration date	12/27/2018

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
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