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Condensed Schedule of Investments (Parenthetical)	6 Months Ended
	Jun. 30, 2013
Cash Equivalents [Member] | Us Treasury Securities [Member] | Us Treasury Bill Securities [Member]
Interest rate	0.06%
Expiration date	11/21/2013
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG August 2013 contracts, expiring July 2013 [Member]
Expiration date	July 2013
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG September 2013 contracts, expiring August 2013 [Member]
Expiration date	August 2013
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG October 2013 contracts, expiring September 2013 [Member]
Expiration date	September 2013
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG November 2013 contracts, expiring October 2013 [Member]
Expiration date	October 2013
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG December 2013 contracts, expiring November 2013 [Member]
Expiration date	November 2013
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG January 2014 contracts, expiring December 2013 [Member]
Expiration date	December 2013
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG February 2014 contracts, expiring January 2014 [Member]
Expiration date	January 2014
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG March 2014 contracts, expiring February 2014 [Member]
Expiration date	February 2014
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG April 2014 contracts, expiring March 2014 [Member]
Expiration date	March 2014
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG May 2014 contracts, expiring April 2014 [Member]
Expiration date	April 2014
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG June 2014 contracts, expiring May 2014 [Member]
Expiration date	May 2014
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG July 2014 contracts, expiring June 2014 [Member]
Expiration date	June 2014

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: 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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X

- Definition

The list of dates or date range within which the options may be exercised of the investment subject to option.

+ 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=6955306&loc=d3e611322-123010



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph 4

-Subparagraph b

-Article 12



Reference 3: 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=6955306&loc=d3e611282-123010



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 13

-Paragraph 5

-Subparagraph d

-Article 12

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