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Schedule of Investments (USD $)
Dec. 31, 2012
Dec. 31, 2011
Cash Equivalents
    
Market Values $ 23,922,430 $ 12,278,369
% of Partners' Capital 55.52% 57.89%
Cash Equivalents | US Treasury Securities | U.S. Treasury Bill
    
Principal Amount 3,400,000 1,760,000
Market Values 3,399,856 1,759,748
% of Partners' Capital 7.89% 8.30%
Cash Equivalents | United State | Money Market Funds
    
Market Values 20,522,574 10,518,621
% of Partners' Capital 47.63% 49.59%
Cash Equivalents | United State | Money Market Funds | Fidelity Institutional Government Portfolio - Class I
    
Principal Amount 2,509,115 2,508,863
Market Values 2,509,115 2,508,863
% of Partners' Capital 5.82% 11.83%
Cash Equivalents | United State | Money Market Funds | Goldman Sachs Financial Square Funds - Government Fund - Class FS
    
Principal Amount 1,502,300  
Market Values 1,502,300  
% of Partners' Capital 3.49%  
Cash Equivalents | United State | Money Market Funds | Goldman Sachs Financial Square Funds - Government Fund - Class SL
    
Principal Amount   1,501,985
Market Values   1,501,985
% of Partners' Capital   7.08%
Cash Equivalents | United State | Money Market Funds | Morgan Stanley Institutional Liquidity Fund - Government Portfolio
    
Principal Amount 6,510,691 6,507,773
Market Values 6,510,691 6,507,773
% of Partners' Capital 15.11% 30.68%
Cash Equivalents | United State | Money Market Funds | Wells Fargo Advantage Government Money Market Fund - Class I
    
Principal Amount 10,000,468  
Market Values 10,000,468  
% of Partners' Capital 23.21%  
Open Futures Contracts, Long | United State
    
Number of Contracts 1,197 642
Unrealized Gain (Loss) on Open Commodity Contracts (906,580) (8,583,320)
% of Partners' Capital (2.10%) (40.47%)
Open Futures Contracts, Long | United State | NYMEX Natural Gas Futures NG February 2013 and February 2012 contracts, expiring January 2013 and January 2012
    
Number of Contracts 99 53
Unrealized Gain (Loss) on Open Commodity Contracts (205,290) (1,134,840)
% of Partners' Capital (0.48%) (5.35%)
Open Futures Contracts, Long | United State | NYMEX Natural Gas Futures NG March 2013 and March 2012 contracts, expiring February 2013 and February 2012
    
Number of Contracts 100 54
Unrealized Gain (Loss) on Open Commodity Contracts (178,200) (992,530)
% of Partners' Capital (0.41%) (4.68%)
Open Futures Contracts, Long | United State | NYMEX Natural Gas Futures NG April 2013 and April 2012 contracts, expiring March 2013 and March 2012
    
Number of Contracts 100 54
Unrealized Gain (Loss) on Open Commodity Contracts (20,820) (902,990)
% of Partners' Capital (0.05%) (4.26%)
Open Futures Contracts, Long | United State | NYMEX Natural Gas Futures NG May 2013 and May 2012 contracts, expiring April 2013 and April 2012
    
Number of Contracts 99 54
Unrealized Gain (Loss) on Open Commodity Contracts 111,460 (882,660)
% of Partners' Capital 0.26% (4.26%)
Open Futures Contracts, Long | United State | NYMEX Natural Gas Futures NG June 2013 and June 2012 contracts, expiring May 2013 and May 2012
    
Number of Contracts 100 53
Unrealized Gain (Loss) on Open Commodity Contracts (55,630) (835,310)
% of Partners' Capital (0.13%) (3.94%)
Open Futures Contracts, Long | United State | NYMEX Natural Gas Futures NG July 2013 and July 2012 contracts, expiring June 2013 and June 2012
    
Number of Contracts 100 53
Unrealized Gain (Loss) on Open Commodity Contracts 191,530 (890,120)
% of Partners' Capital 0.45% (4.20%)
Open Futures Contracts, Long | United State | NYMEX Natural Gas Futures NG August 2013 and August 2012 contracts, expiring July 2013 and July 2012
    
Number of Contracts 100 54
Unrealized Gain (Loss) on Open Commodity Contracts (61,640) (839,470)
% of Partners' Capital (0.14%) (3.96%)
Open Futures Contracts, Long | United State | NYMEX Natural Gas Futures NG September 2013 and September 2012 contracts, expiring August 2013 and August 2012
    
Number of Contracts 100 54
Unrealized Gain (Loss) on Open Commodity Contracts 46,640 (693,560)
% of Partners' Capital 0.11% (3.27%)
Open Futures Contracts, Long | United State | NYMEX Natural Gas Futures NG October 2013 and October 2012 contracts, expiring September 2013 and September 2012
    
Number of Contracts 100 54
Unrealized Gain (Loss) on Open Commodity Contracts (90,560) (662,680)
% of Partners' Capital (0.21%) (3.12%)
Open Futures Contracts, Long | United State | NYMEX Natural Gas Futures NG November 2013 and November 2012 contracts, expiring October 2013 and October 2012
    
Number of Contracts 100 53
Unrealized Gain (Loss) on Open Commodity Contracts (334,130) (426,230)
% of Partners' Capital (0.78%) (2.01%)
Open Futures Contracts, Long | United State | NYMEX Natural Gas Futures NG December 2013 and December 2012 contracts, expiring November 2013 and November 2012
    
Number of Contracts 99 53
Unrealized Gain (Loss) on Open Commodity Contracts (334,500) (250,390)
% of Partners' Capital (0.78%) (1.18%)
Open Futures Contracts, Long | United State | NYMEX Natural Gas Futures NG January 2014 and January 2013 contracts, expiring December 2013 and December 2012
    
Number of Contracts 100 53
Unrealized Gain (Loss) on Open Commodity Contracts $ 24,560 $ (72,540)
% of Partners' Capital 0.06% (0.34%)