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Condensed Schedule of Investments (Parenthetical) (USD $) | 3 Months Ended
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Mar. 31, 2015
Debt Instrument, Collateral Amount | 5,231,739 us-gaap_DebtInstrumentCollateralAmount
Interest Rate | 0.005%us-gaap_DebtInstrumentInterestRateStatedPercentage
Cash Equivalents [Member] | Us Treasury Bill Securities [Member] | U.S. Treasury Bill, 0.06%, 4/30/2015 [Member] |
Expiration date | 4/30/2015
Interest Rate | 0.06%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = us-gaap_USTreasuryBillSecuritiesMember
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 [Memer] |
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

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