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Condensed Schedule of Investments (Parenthetical)	3 Months Ended
	Mar. 31, 2018 USD ($)
Debt Instrument, Collateral Amount	$ 979,150
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.19%, 04/05/2018 [Member]
Expiration date	4/05/2018
Interest Rate	1.19%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.22%, 04/12/2018 [Member]
Expiration date	4/12/2018
Interest Rate	1.22%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.23%, 04/19/2018 [Member]
Expiration date	4/19/2018
Interest Rate	1.23%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.25%, 04/26/2018 [Member]
Expiration date	4/26/2018
Interest Rate	1.25%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.27%, 05/03/2018 [Member]
Expiration date	5/03/2018
Interest Rate	1.27%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.32%, 05/10/2018 [Member]
Expiration date	5/10/2018
Interest Rate	1.32%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.37%, 05/17/2018 [Member]
Expiration date	5/17/2018
Interest Rate	1.37%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.43%, 05/24/2018 [Member]
Expiration date	5/24/2018
Interest Rate	1.43%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.43%, 05/31/2018 [Member]
Expiration date	5/31/2018
Interest Rate	1.43%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.45%, 06/07/2018 [Member]
Expiration date	6/07/2018
Interest Rate	1.45%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.46%, 06/14/2018 [Member]
Expiration date	6/14/2018
Interest Rate	1.46%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.49%, 06/21/2018 [Member]
Expiration date	6/21/2018
Interest Rate	1.49%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.50%, 06/28/2018 [Member]
Expiration date	6/28/2018
Interest Rate	1.50%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.56%, 07/05/2018 [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%, 09/06/2018 [Member]
Expiration date	9/06/2018
Interest Rate	1.85%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.90%, 09/13/2018 [Member]
Expiration date	9/13/2018
Interest Rate	1.90%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.92%, 09/20/2018 [Member]
Expiration date	9/20/2018
Interest Rate	1.92%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.90%, 09/27/2018 [Member]
Expiration date	9/27/2018
Interest Rate	1.90%

X

- Definition

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
-Subparagraph (d)
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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
-Subparagraph (SX 210.5-02.22(a)(1))
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+ References

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))
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