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Condensed Schedule of Investments (USD $)
Jun. 30, 2013
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.