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Schedule of Investments (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument, Collateral Amount	$ 699,804	$ 4,322,372
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.19%, 2/04/2016 [Member]
Expiration date		2/04/2016
Interest Rate		0.19%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.22%, 2/11/2016 [Member]
Expiration date		2/11/2016
Interest Rate		0.22%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.43%, 6/02/2016 [Member]
Expiration date		6/02/2016
Interest Rate		0.43%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.52%, 6/09/2016 [Member]
Expiration date		6/09/2016
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] | United State [Member] | U.S. Treasury Bills: 0.34%, 1/05/2017 [Member]
Expiration date	1/05/2017
Interest Rate	0.34%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.43%, 1/19/2017 [Member]
Expiration date	1/19/2017
Interest Rate	0.43%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.36%, 1/26/2017 [Member]
Expiration date	1/26/2017
Interest Rate	0.36%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills 0.40%, 2/02/2017 [Member]
Expiration date	2/02/2017
Interest Rate	0.40%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.42%, 2/09/2017 [Member]
Expiration date	2/09/2017
Interest Rate	0.42%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.45%, 2/16/2017 [Member]
Expiration date	2/16/2017
Interest Rate	0.45%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.45%, 2/23/2017 [Member]
Expiration date	2/23/2017
Interest Rate	0.45%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.45%, 3/02/2017 [Member]
Expiration date	3/02/2017
Interest Rate	0.45%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.47%, 3/09/2017 [Member]
Expiration date	3/09/2017
Interest Rate	0.47%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.50%, 3/16/2017 [Member]
Expiration date	3/16/2017
Interest Rate	0.50%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.45%, 3/23/2017 [Member]
Expiration date	3/23/2017
Interest Rate	0.45%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.43%, 3/30/2017 [Member]
Expiration date	3/30/2017
Interest Rate	0.43%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.46%, 4/06/2017 [Member]
Expiration date	4/06/2017
Interest Rate	0.46%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.47%, 4/13/2017 [Member]
Expiration date	4/13/2017
Interest Rate	0.47%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.46%, 4/20/2017 [Member]
Expiration date	4/20/2017
Interest Rate	0.46%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.47%, 4/27/2017 [Member]
Expiration date	4/27/2017
Interest Rate	0.47%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.49%, 5/04/2017 [Member]
Expiration date	5/04/2017
Interest Rate	0.49%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.55%, 5/11/2017 [Member]
Expiration date	5/11/2017
Interest Rate	0.55%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.60%, 5/18/2017 [Member]
Expiration date	5/18/2017
Interest Rate	0.60%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.61%, 5/25/2017 [Member]
Expiration date	5/25/2017
Interest Rate	0.61%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.60%, 6/01/2017 [Member]
Expiration date	6/01/2017
Interest Rate	0.60%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.62%, 6/08/2017 [Member]
Expiration date	6/08/2017
Interest Rate	0.62%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.65%, 6/15/2017 [Member]
Expiration date	6/15/2017
Interest Rate	0.65%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.64%, 6/22/2017 [Member]
Expiration date	6/22/2017
Interest Rate	0.64%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bills: 0.60%, 6/29/2017 [Member]
Expiration date	6/29/2017
Interest Rate	0.60%
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
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2017 contracts, expiring January 2017 [Member]
Expiration date	January 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG March 2017 contracts, expiring February 2017 [Member]
Expiration date	February 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG April 2017 contracts, expiring March 2017 [Member]
Expiration date	March 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG May 2017 contracts, expiring April 2017 [Member]
Expiration date	April 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2017 contracts, expiring May 2017 [Member]
Expiration date	May 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2017 contracts, expiring June 2017 [Member]
Expiration date	June 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2017 contracts, expiring July 2017 [Member]
Expiration date	July 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2017 contracts, expiring August 2017 [Member]
Expiration date	August 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2017 contracts, expiring September 2017 [Member]
Expiration date	September 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG November 2017 contracts, expiring October 2017 [Member]
Expiration date	October 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG December 2017 contracts, expiring November 2017 [Member]
Expiration date	November 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG January 2018 contracts, expiring December 2017 [Member]
Expiration date	December 2017

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Amount of assets pledged to secure a debt instrument.

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