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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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