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Condensed Schedule of Investments (Parenthetical)	3 Months Ended
	Mar. 31, 2017 USD ($)
Debt Instrument, Collateral Amount	$ 799,753
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.46%, 4/06/2017
Expiration date	4/06/2017
Interest Rate	0.46%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 4/13/2017
Expiration date	4/13/2017
Interest Rate	0.47%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.46%, 4/20/2017
Expiration date	4/20/2017
Interest Rate	0.46%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 4/27/2017
Expiration date	4/27/2017
Interest Rate	0.47%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.49%, 5/04/2017
Expiration date	5/04/2017
Interest Rate	0.49%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.55%, 5/11/2017
Expiration date	5/11/2017
Interest Rate	0.55%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.60%, 5/18/2017
Expiration date	5/18/2017
Interest Rate	0.60%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.61%, 5/25/2017
Expiration date	5/25/2017
Interest Rate	0.61%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.60%, 6/01/2017
Expiration date	6/01/2017
Interest Rate	0.60%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.64%, 6/22/2017
Expiration date	6/22/2017
Interest Rate	0.64%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.60%, 6/29/2017
Expiration date	6/29/2017
Interest Rate	0.60%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.62%, 7/06/2017
Expiration date	7/06/2017
Interest Rate	0.62%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.59%, 7/13/2017
Expiration date	7/13/2017
Interest Rate	0.59%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.61%, 7/20/2017
Expiration date	7/20/2017
Interest Rate	0.61%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.60%, 7/27/2017
Expiration date	7/27/2017
Interest Rate	0.60%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.63%, 8/03/2017
Expiration date	8/03/2017
Interest Rate	0.63%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.61%, 8/10/2017
Expiration date	8/10/2017
Interest Rate	0.61%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.65%, 8/17/2017
Expiration date	8/17/2017
Interest Rate	0.65%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.67%, 8/24/2017
Expiration date	8/24/2017
Interest Rate	0.67%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.76%, 8/31/2017
Expiration date	8/31/2017
Interest Rate	0.76%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.84%, 9/07/2017
Expiration date	9/07/2017
Interest Rate	0.84%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.86%, 9/14/2017
Expiration date	9/14/2017
Interest Rate	0.86%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.87%, 9/21/2017
Expiration date	9/21/2017
Interest Rate	0.87%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.89%, 9/28/2017
Expiration date	9/28/2017
Interest Rate	0.89%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.62%, 6/08/2017
Expiration date	6/08/2017
Interest Rate	0.62%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.65%, 6/15/2017
Expiration date	6/15/2017
Interest Rate	0.65%

X

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Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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
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