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Condensed Schedule of Investments [Parenthetical]	6 Months Ended
	Jun. 30, 2017 USD ($)
Collateral amount on open futures contracts	$ 12,049,449
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.62%, 7/06/2017 | Us Treasury Securities [Member]
Interest rate	0.62%
Expiration date	7/06/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.59%, 7/13/2017 | Us Treasury Securities [Member]
Interest rate	0.59%
Expiration date	7/13/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.61%, 7/20/2017 | Us Treasury Securities [Member]
Interest rate	0.61%
Expiration date	7/20/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.60%, 7/27/2017 | Us Treasury Securities [Member]
Interest rate	0.60%
Expiration date	7/27/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.63%, 8/03/2017 | Us Treasury Securities [Member]
Interest rate	0.63%
Expiration date	8/03/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.61%, 8/10/2017 | Us Treasury Securities [Member]
Interest rate	0.61%
Expiration date	8/10/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.65%, 8/17/2017 | Us Treasury Securities [Member]
Interest rate	0.65%
Expiration date	8/17/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.67%, 8/24/2017 | Us Treasury Securities [Member]
Interest rate	0.67%
Expiration date	8/24/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.76%, 8/31/2017 | Us Treasury Securities [Member]
Interest rate	0.76%
Expiration date	8/31/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.84%, 9/07/2017 | Us Treasury Securities [Member]
Interest rate	0.84%
Expiration date	9/07/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.86%, 9/14/2017 | Us Treasury Securities [Member]
Interest rate	0.86%
Expiration date	9/14/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.87%, 9/21/2017 | Us Treasury Securities [Member]
Interest rate	0.87%
Expiration date	9/21/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.89%, 9/28/2017 | Us Treasury Securities [Member]
Interest rate	0.89%
Expiration date	9/28/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.90%, 10/05/2017 | Us Treasury Securities [Member]
Interest rate	0.90%
Expiration date	10/05/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.92%, 10/12/2017 | Us Treasury Securities [Member]
Interest rate	0.92%
Expiration date	10/12/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.91%, 10/19/2017 | Us Treasury Securities [Member]
Interest rate	0.91%
Expiration date	10/19/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.95%, 10/26/2017 | Us Treasury Securities [Member]
Interest rate	0.95%
Expiration date	10/26/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.97%, 11/02/2017 | Us Treasury Securities [Member]
Interest rate	0.97%
Expiration date	11/02/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,1.01%, 11/09/2017 | Us Treasury Securities [Member]
Interest rate	1.01%
Expiration date	11/09/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,0.98%, 11/16/2017 | Us Treasury Securities [Member]
Interest rate	0.98%
Expiration date	11/16/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,1.05%, 11/24/2017 | Us Treasury Securities [Member]
Interest rate	1.05%
Expiration date	11/24/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,1.05%, 11/30/2017 | Us Treasury Securities [Member]
Interest rate	1.05%
Expiration date	11/30/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,1.08%, 12/07/2017 | Us Treasury Securities [Member]
Interest rate	1.08%
Expiration date	12/07/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,1.09%, 12/14/2017 | Us Treasury Securities [Member]
Interest rate	1.09%
Expiration date	12/14/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,1.11%, 12/21/2017 | Us Treasury Securities [Member]
Interest rate	1.11%
Expiration date	12/21/2017
Cash Equivalents [Member] | United States [Member] | U.S. Treasury Bills,1.10%, 12/28/2017 | Us Treasury Securities [Member]
Interest rate	1.10%
Expiration date	12/28/2017

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14.4(b))
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5
-Subparagraph (SX 210.12-13.5(d))
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