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Condensed Schedule of Investments (Parenthetical)	9 Months Ended
	Sep. 30, 2017 USD ($)
Debt Instrument, Collateral Amount	$ 1,411,924
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.90%, 10/05/2017 [Member]
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 [Member]
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 [Member]
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 [Member]
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 [Member]
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 [Member]
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 [Member]
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 [Member]
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 [Member]
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 [Member]
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 [Member]
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 [Member]
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 [Member]
Expiration date	12/28/2017
Interest Rate	1.10%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.12%, 1/04/2018 [Member]
Expiration date	1/04/2018
Interest Rate	1.12%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.11%, 1/11/2018 [Member]
Expiration date	1/11/2018
Interest Rate	1.11%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.10%, 1/18/2018 [Member]
Expiration date	1/18/2018
Interest Rate	1.10%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.12%, 1/25/2018 [Member]
Expiration date	1/25/2018
Interest Rate	1.12%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.12%, 2/01/2018 [Member]
Expiration date	2/01/2018
Interest Rate	1.12%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.13%, 2/08/2018 [Member]
Expiration date	2/08/2018
Interest Rate	1.13%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.12%, 2/15/2018 [Member]
Expiration date	2/15/2018
Interest Rate	1.12%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.10%, 2/22/2018 [Member]
Expiration date	2/22/2018
Interest Rate	1.10%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.09%, 3/01/2018 [Member]
Expiration date	3/01/2018
Interest Rate	1.09%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.14%, 3/08/2018 [Member]
Expiration date	3/08/2018
Interest Rate	1.14%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.14%, 3/15/2018 [Member]
Expiration date	3/15/2018
Interest Rate	1.14%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.16%, 3/22/2018 [Member]
Expiration date	3/22/2018
Interest Rate	1.16%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 1.17%, 3/29/2018 [Member]
Expiration date	3/29/2018
Interest Rate	1.17%
Cash Equivalents [Member] | United States [Member] | NYMEX Natural Gas Futures NG December 2017 contracts, expiring November 2017 [Member]
Expiration date	November 2017
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG November 2017 contracts, expiring October 2017 [Member]
Expiration date	October 2017
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG January 2018 contracts, expiring December 2017 [Member]
Expiration date	December 2017
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG February 2018 contracts, expiring January 2018 [Member]
Expiration date	January 2018
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG March 2018 contracts, expiring February 2018 [Member]
Expiration date	February 2018
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG April 2018 contracts, expiring March 2018 [Member]
Expiration date	March 2018
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG May 2018 contracts, expiring April 2018 [Member]
Expiration date	April 2018
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG June 2018 contracts, expiring May 2018 [Member]
Expiration date	May 2018
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG July 2018 contracts, expiring June 2018 [Member]
Expiration date	June 2018
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG August 2018 contracts, expiring July 2018 [Member]
Expiration date	July 2018
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG September 2018 contracts, expiring August 2018 [Member]
Expiration date	August 2018
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG October 2018 contracts, expiring September 2018 [Member]
Expiration date	September 2018

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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
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
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