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Condensed Schedule of Investments (Parenthetical)	9 Months Ended
	Sep. 30, 2016
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.39%, 10/27/2016
Expiration date	10/27/2016
Interest Rate	0.39%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.37%, 11/03/2016
Expiration date	11/03/2016
Interest Rate	0.37%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.39%, 11/17/2016
Expiration date	11/17/2016
Interest Rate	0.39%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 12/01/2016
Expiration date	12/01/2016
Interest Rate	0.47%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.41%, 12/08/2016
Expiration date	12/08/2016
Interest Rate	0.41%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.34%, 12/15/2016
Expiration date	12/15/2016
Interest Rate	0.34%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.34%, 12/29/2016
Expiration date	12/29/2016
Interest Rate	0.34%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.34%, 1/05/2017
Expiration date	1/05/2017
Interest Rate	0.34%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.43%, 1/19/2017
Expiration date	1/19/2017
Interest Rate	0.43%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.36%, 1/26/2017
Expiration date	1/26/2017
Interest Rate	0.36%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.40%, 2/02/2017
Expiration date	2/02/2017
Interest Rate	0.40%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.42%, 2/09/2017
Expiration date	2/09/2017
Interest Rate	0.42%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 2/16/2017
Expiration date	2/16/2017
Interest Rate	0.45%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 2/23/2017
Expiration date	2/23/2017
Interest Rate	0.45%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 3/02/2017
Expiration date	3/02/2017
Interest Rate	0.45%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 3/09/2017
Expiration date	3/09/2017
Interest Rate	0.47%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.50%, 3/16/2017
Expiration date	3/16/2017
Interest Rate	0.50%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 3/23/2017
Expiration date	3/23/2017
Interest Rate	0.45%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.43%, 3/30/2017
Expiration date	3/30/2017
Interest Rate	0.43%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG November 2016 contracts, expiring October 2016
Expiration date	October 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG December 2016 contracts, expiring November 2016
Expiration date	November 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG January 2017 contracts, expiring December 2016
Expiration date	December 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2017 contracts, expiring January 2017
Expiration date	January 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG March 2017 contracts, expiring February 2017
Expiration date	February 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG April 2017 contracts, expiring March 2017
Expiration date	March 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG May 2017 contracts, expiring April 2017
Expiration date	April 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2017 contracts, expiring May 2017
Expiration date	May 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2017 contracts, expiring June 2017
Expiration date	June 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2017 contracts, expiring July 2017
Expiration date	July 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2017 contracts, expiring August 2017
Expiration date	August 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2017 contracts, expiring September 2017
Expiration date	September 2017

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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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))
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 5
-Subparagraph (SX 210.12-13.5(d))
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010

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