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Condensed Schedule of Investments (Parenthetical)	6 Months Ended
	Jun. 30, 2017 USD ($)
Debt Instrument, Collateral Amount	$ 1,192,186
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: 0.90%, 10/05/2017
Expiration date	10/05/2017
Interest Rate	0.90%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.92%, 10/12/2017
Expiration date	10/12/2017
Interest Rate	0.92%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.91%, 10/19/2017
Expiration date	10/19/2017
Interest Rate	0.91%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.95%, 10/26/2017
Expiration date	10/26/2017
Interest Rate	0.95%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.97%, 11/02/2017
Expiration date	11/02/2017
Interest Rate	0.97%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.01%, 11/09/2017
Expiration date	11/09/2017
Interest Rate	1.01%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.98%, 11/16/2017
Expiration date	11/16/2017
Interest Rate	0.98%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.05%, 11/24/2017
Expiration date	11/24/2017
Interest Rate	1.05%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.05%, 11/30/2017
Expiration date	11/30/2017
Interest Rate	1.05%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.08%, 12/07/2017
Expiration date	12/07/2017
Interest Rate	1.08%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.09%, 12/14/2017
Expiration date	12/14/2017
Interest Rate	1.09%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.11%, 12/21/2017
Expiration date	12/21/2017
Interest Rate	1.11%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.10%, 12/28/2017
Expiration date	12/28/2017
Interest Rate	1.10%

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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