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Condensed Schedule of Investments (Parenthetical) (Open Futures Contracts, Long [Member], United State [Member], USD $)	3 Months Ended
	Mar. 31, 2014
Debt Instrument, Collateral Amount	$ 308,837
NYMEX Natural Gas Futures NG May 2014 contracts, expiring April 2014 [Member]
Expiration date	April 2014
NYMEX Natural Gas Futures NG June 2014 contracts, expiring May 2014 [Member]
Expiration date	May 2014
NYMEX Natural Gas Futures NG July 2014 contracts, expiring June 2014 [Member]
Expiration date	June 2014
NNYMEX Natural Gas Futures NG August 2014 contracts, expiring July 2014 [Member]
Expiration date	July 2014
NYMEX Natural Gas Futures NG September 2014 contracts, expiring August 2014 [Member]
Expiration date	August 2014
NYMEX Natural Gas Futures NG October 2014 contracts, expiring September 2014 [Member]
Expiration date	September 2014
NYMEX Natural Gas Futures NG November 2014 contracts, expiring October 2014 [Member]
Expiration date	October 2014
NYMEX Natural Gas Futures NG December 2014 contracts, expiring November 2014 [Member]
Expiration date	November 2014
NYMEX Natural Gas Futures NG January 2015 contracts, expiring December 2014 [Member]
Expiration date	December 2014
NYMEX Natural Gas Futures NG February 2015 contracts, expiring January 2015 [Member]
Expiration date	January 2015
NYMEX Natural Gas Futures NG March 2015 contracts, expiring February 2015 [Member]
Expiration date	February 2015
NYMEX Natural Gas Futures NG April 2015 contracts, expiring March 2015 (Member)
Expiration date	March 2015

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)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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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Balance Type:	na
Period Type:	duration