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Schedule of Investments (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument, Collateral Amount	$ 4,322,372	$ 5,525,172
Investment Owned, Percent of Net Assets		0.005%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.19%, 2/04/2016 [Member]
Expiration date	02/04/2016
Interest Rate	0.19%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.22%, 2/11/2016 [Member]
Expiration date	02/11/2016
Interest Rate	0.22%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.43%, 6/02/2016 [Member]
Expiration date	06/02/2016
Interest Rate	0.43%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.52%, 6/09/2016 [Member]
Expiration date	06/09/2016
Interest Rate	0.52%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 6/30/2016 [Member]
Expiration date	6/30/2016
Interest Rate	0.47%
Cash Equivalents [Member] | U.S. Treasury Bills: 0.06%, 4/30/15 [Member] | Us Treasury Securities [Member]
Expiration date		4/30/15
Interest Rate		0.06%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2015 contracts, expiring January 2015 [Member]
Expiration date		January 2015
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG March 2015 contracts, expiring February 2015 [Member]
Expiration date		February 2015
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG April 2015 contracts, expiring March 2015 [Member]
Expiration date		March 2015
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG May 2015 contracts, expiring April 2015 [Member]
Expiration date		April 2015
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2015 contracts, expiring May 2015 [Member]
Expiration date		May 2015
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2015 contracts, expiring June 2015 [Member]
Expiration date		June 2015
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2015 contracts, expiring July 2015 [Member]
Expiration date		July 2015
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2015 contracts, expiring August 2015 [Member]
Expiration date		August 2015
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2015 contracts, expiring September 2015 [Member]
Expiration date		September 2015
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG November 2015 contracts, expiring October 2015 [Member]
Expiration date		October 2015
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG December 2015 contracts, expiring November 2015 [Member]
Expiration date		November 2015
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG January 2016 contracts, expiring December 2015 [Member]
Expiration date		December 2015
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2016 contracts, expiring January 2016 [Member]
Expiration date	January 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG March 2016 contracts, expiring February 2016 [Member]
Expiration date	February 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG April 2016 contracts, expiring March 2016 [Member]
Expiration date	March 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG May 2016 contracts, expiring April 2016 [Member]
Expiration date	April 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2016 contracts, expiring May 2016 [Member]
Expiration date	May 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2016 contracts, expiring June 2016 [Member]
Expiration date	June 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2016 contracts, expiring July 2016 [Member]
Expiration date	July 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2016 contracts, expiring August 2016 [Member]
Expiration date	August 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2016 contracts, expiring September 2016 [Member]
Expiration date	September 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG November 2016 contracts, expiring October 2016 [Member]
Expiration date	October 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG December 2016 contracts, expiring November 2016 [Member]
Expiration date	November 2016
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG January 2017 contracts, expiring December 2016 [Member]
Expiration date	December 2016

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