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Condensed Schedule of Investments (Parenthetical) | 9 Months Ended
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Sep. 30, 2016
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 | 11/03/2016
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 | 12/01/2016
Interest Rate | 0.47%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.41%, 12/08/2016 |
Expiration date | 12/08/2016
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%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.34%, 1/05/2017 |
Expiration date | 1/05/2017
Interest Rate | 0.34%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.43%, 1/19/2017 |
Expiration date | 1/19/2017
Interest Rate | 0.43%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.36%, 1/26/2017 |
Expiration date | 1/26/2017
Interest Rate | 0.36%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.40%, 2/02/2017 |
Expiration date | 2/02/2017
Interest Rate | 0.40%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.42%, 2/09/2017 |
Expiration date | 2/09/2017
Interest Rate | 0.42%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 2/16/2017 |
Expiration date | 2/16/2017
Interest Rate | 0.45%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 2/23/2017 |
Expiration date | 2/23/2017
Interest Rate | 0.45%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 3/02/2017 |
Expiration date | 3/02/2017
Interest Rate | 0.45%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 3/09/2017 |
Expiration date | 3/09/2017
Interest Rate | 0.47%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.50%, 3/16/2017 |
Expiration date | 3/16/2017
Interest Rate | 0.50%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 3/23/2017 |
Expiration date | 3/23/2017
Interest Rate | 0.45%
Cash Equivalents [Member] | Us Treasury Securities [Member] | U.S. Treasury Bills: 0.43%, 3/30/2017 |
Expiration date | 3/30/2017
Interest Rate | 0.43%
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 May 2017 contracts, expiring April 2017 |
Expiration date | April 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2017 contracts, expiring May 2017 |
Expiration date | May 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2017 contracts, expiring June 2017 |
Expiration date | June 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2017 contracts, expiring July 2017 |
Expiration date | July 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2017 contracts, expiring August 2017 |
Expiration date | August 2017
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2017 contracts, expiring September 2017 |
Expiration date | September 2017

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