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Condensed Schedule of Investments (USD $) | Jun. 30, 2013
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Cash Equivalents [Member] |  |
Market Values | $ 22,322,145 |
% of Partners' Capital | 86.49% |
Cash Equivalents [Member] | United State [Member] | US Treasury Securities [Member] | U.S. Treasury Bill [Member] |  |
Principal Amount | 1,800,000 |
Market Values | 1,799,571 |
% of Partners' Capital | 6.97% |
Cash Equivalents [Member] | United State [Member] | Money Market Funds [Member] |  |
Market Values | 20,522,574 |
% of Partners' Capital | 79.52% |
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 | 9.72% |
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 | 5.82% |
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 | 25.23% |
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 | 38.75% |
Open Futures Contracts, Long [Member] | United State [Member] |  |
Number of Contracts | 686 | [1]
Unrealized Gain on Open Commodity Contracts | (1,347,400) | [1]
% of Partners' Capital | (5.22%) | [1]
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2013 contracts, expiring July 2013 [Member] |  |
Number of Contracts | 57 |
Unrealized Gain on Open Commodity Contracts | (53,050) |
% of Partners' Capital | (0.21%) |
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2013 contracts, expiring August 2013 [Member] |  |
Number of Contracts | 57 |
Unrealized Gain on Open Commodity Contracts | (3,060) |
% of Partners' Capital | (0.01%) |
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2013 contracts, expiring September 2013 [Member] |  |
Number of Contracts | 57 |
Unrealized Gain on Open Commodity Contracts | (81,410) |
% of Partners' Capital | (0.32%) |
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG November 2013 contracts, expiring October 2013 [Member] |  |
Number of Contracts | 57 |
Unrealized Gain on Open Commodity Contracts | (224,260) |
% of Partners' Capital | (0.87%) |
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG December 2013 contracts, expiring November 2013 [Member] |  |
Number of Contracts | 57 |
Unrealized Gain on Open Commodity Contracts | (245,870) |
% of Partners' Capital | (0.95%) |
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG January 2014 contracts, expiring December 2013 [Member] |  |
Number of Contracts | 58 |
Unrealized Gain on Open Commodity Contracts | (79,880) |
% of Partners' Capital | (0.31%) |
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2014 contracts, expiring January 2014 [Member] |  |
Number of Contracts | 57 |
Unrealized Gain on Open Commodity Contracts | (110,970) |
% of Partners' Capital | (0.43%) |
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG March 2014 contracts, expiring February 2014 [Member] |  |
Number of Contracts | 57 |
Unrealized Gain on Open Commodity Contracts | (44,160) |
% of Partners' Capital | (0.17%) |
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG April 2014 contracts, expiring March 2014 [Member] |  |
Number of Contracts | 57 |
Unrealized Gain on Open Commodity Contracts | (124,990) |
% of Partners' Capital | (0.48%) |
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG May 2014 contracts, expiring April 2014 [Member] |  |
Number of Contracts | 57 |
Unrealized Gain on Open Commodity Contracts | (149,100) |
% of Partners' Capital | (0.58%) |
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2014 contracts, expiring May 2014 [Member] |  |
Number of Contracts | 58 |
Unrealized Gain on Open Commodity Contracts | (158,190) |
% of Partners' Capital | (0.61%) |
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2014 contracts, expiring June 2014 [Member] |  |
Number of Contracts | 57 |
Unrealized Gain on Open Commodity Contracts | $ (72,460) |
% of Partners' Capital | (0.28%) |
[1] | Collateral amounted to $3,050,936 on open futures contracts.

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