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Condensed Schedule of Investments (Parenthetical)	3 Months Ended
	Mar. 31, 2016
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.29%, 5/19/2016
Expiration date	5/19/2016
Interest Rate	0.29%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.43%, 6/02/2016
Expiration date	6/2/2016
Interest Rate	0.43%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.52%, 6/09/2016
Expiration date	6/9/2016
Interest Rate	0.52%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 6/30/2016
Expiration date	6/30/2016
Interest Rate	0.47%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.38%, 7/21/2016
Expiration date	7/21/2016
Interest Rate	0.38%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.39%, 7/28/2016
Expiration date	7/28/2016
Interest Rate	0.39%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.42%, 8/04/2016
Expiration date	8/4/2016
Interest Rate	0.42%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.41%, 8/11/2016
Expiration date	8/11/2016
Interest Rate	0.41%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.43%, 8/18/2016
Expiration date	8/18/2016
Interest Rate	0.43%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 8/25/2016
Expiration date	8/25/2016
Interest Rate	0.45%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.48%, 9/01/2016
Expiration date	9/1/2016
Interest Rate	0.48%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 9/15/2016
Expiration date	9/15/2016
Interest Rate	0.45%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.44%, 9/22/2016
Expiration date	9/22/2016
Interest Rate	0.44%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG May 2016 contracts, expiring April 2016
Expiration date	April 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2016 contracts, expiring May 2016
Expiration date	May 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2016 contracts, expiring June 2016
Expiration date	June 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2016 contracts, expiring July 2016
Expiration date	July 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2016 contracts, expiring August 2016
Expiration date	August 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2016 contracts, expiring September 2016
Expiration date	September 2016
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

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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+ 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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