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Condensed Schedule of Investments (Parenthetical) | 6 Months Ended
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Jun. 30, 2016 USD ($)
Debt Instrument, Collateral Amount | $ 1,674,775
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%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.39%, 10/27/2016 |
Expiration date | 10/27/2016
Interest Rate | 0.39%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.37%, 11/03/2016 |
Expiration date | 11/3/2016
Interest Rate | 0.37%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.39%, 11/17/2016 |
Expiration date | 11/17/2016
Interest Rate | 0.39%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 12/01/2016 |
Expiration date | 12/1/2016
Interest Rate | 0.47%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.41%, 12/08/2016 |
Expiration date | 12/8/2016
Interest Rate | 0.41%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.34%, 12/15/2016 |
Expiration date | 12/15/2016
Interest Rate | 0.34%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.34%, 12/29/2016 |
Expiration date | 12/29/2016
Interest Rate | 0.34%
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
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2016 contracts, expiring January 2016 [Member] |
Expiration date | April 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG March 2016 contracts, expiring February 2016 [Member] |
Expiration date | May 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG April 2016 contracts, expiring March 2016 [Member] |
Expiration date | June 2017

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