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Condensed Schedule of Investments (USD $)	Mar. 31, 2013
Cash Equivalents [Member]
Market Values	$ 22,902,282
% of Partners' Capital	52.79%
Cash Equivalents [Member] | United State [Member] | US Treasury Securities [Member] | U.S. Treasury Bill [Member]
Principal Amount	2,380,000
Market Values	2,379,708
% of Partners' Capital	5.48%
Cash Equivalents [Member] | United State [Member] | Money Market Funds [Member]
Market Values	20,522,574
% of Partners' Capital	47.31%
Cash Equivalents [Member] | United State [Member] | Money Market Funds [Member] | Fidelity Institutional Government Portfolio - Class I [Member]
Principal Amount	2,509,115
Market Values	2,509,115
% of Partners' Capital	5.79%
Cash Equivalents [Member] | United State [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]
Principal Amount	1,502,300
Market Values	1,502,300
% of Partners' Capital	3.46%
Cash Equivalents [Member] | United State [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Fund - Government Portfolio [Member]
Principal Amount	6,510,691
Market Values	6,510,691
% of Partners' Capital	15.01%
Cash Equivalents [Member] | United State [Member] | Money Market Funds [Member] | Wells Fargo Advantage Government Money Market Fund - Class I [Member]
Principal Amount	10,000,468
Market Values	10,000,468
% of Partners' Capital	23.05%
Open Futures Contracts, Long [Member] | United State [Member]
Number of Contracts	1,034
Unrealized Gain on Open Commodity Contracts	4,023,690
% of Partners' Capital	9.27%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG May 2013 contracts, expiring April 2013 [Member]
Number of Contracts	86
Unrealized Gain on Open Commodity Contracts	555,700
% of Partners' Capital	1.28%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2013 contracts, expiring May 2013 [Member]
Number of Contracts	86
Unrealized Gain on Open Commodity Contracts	430,950
% of Partners' Capital	0.99%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2013 contracts, expiring June 2013 [Member]
Number of Contracts	86
Unrealized Gain on Open Commodity Contracts	601,980
% of Partners' Capital	1.39%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2013 contracts, expiring July 2013 [Member]
Number of Contracts	86
Unrealized Gain on Open Commodity Contracts	410,820
% of Partners' Capital	0.95%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2013 contracts, expiring August 2013 [Member]
Number of Contracts	86
Unrealized Gain on Open Commodity Contracts	480,510
% of Partners' Capital	1.11%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2013 contracts, expiring September 2013 [Member]
Number of Contracts	87
Unrealized Gain on Open Commodity Contracts	358,270
% of Partners' Capital	0.82%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG November 2013 contracts, expiring October 2013 [Member]
Number of Contracts	87
Unrealized Gain on Open Commodity Contracts	124,990
% of Partners' Capital	0.29%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG December 2013 contracts, expiring November 2013 [Member]
Number of Contracts	86
Unrealized Gain on Open Commodity Contracts	71,250
% of Partners' Capital	0.16%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG January 2014 contracts, expiring December 2013 [Member]
Number of Contracts	86
Unrealized Gain on Open Commodity Contracts	333,670
% of Partners' Capital	0.77%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2014 contracts, expiring January 2014 [Member]
Number of Contracts	86
Unrealized Gain on Open Commodity Contracts	256,200
% of Partners' Capital	0.59%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG March 2014 contracts, expiring February 2014 [Member]
Number of Contracts	86
Unrealized Gain on Open Commodity Contracts	339,620
% of Partners' Capital	0.78%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG April 2014 contracts, expiring March 2014 [Member]
Number of Contracts	86
Unrealized Gain on Open Commodity Contracts	$ 59,730
% of Partners' Capital	0.14%

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