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Schedule of Investments (USD $)
Dec. 31, 2012
Dec. 31, 2011
Cash Equivalents
    
% of Partners' Capital 90.33% 51.91%
Market Values $ 40,715,676 $ 19,346,002
Cash Equivalents | US Treasury Securities | U.S. Treasury Bill
    
% of Partners' Capital 5.99% 6.28%
Principal Amount 2,700,000 2,340,000
Market Values 2,699,886 2,339,665
Cash Equivalents | United States | Money Market Funds
    
% of Partners' Capital 84.34% 45.63%
Market Values 38,015,790 17,006,337
Cash Equivalents | United States | Money Market Funds | Fidelity Institutional Government Portfolio - Class I
    
% of Partners' Capital 12.21% 14.76%
Principal Amount 5,502,749 5,502,196
Market Values 5,502,749 5,502,196
Cash Equivalents | United States | Money Market Funds | Goldman Sachs Financial Square Funds - Government Fund - Class FS
    
% of Partners' Capital 24.41%  
Principal Amount 11,002,270  
Market Values 11,002,270  
Cash Equivalents | United States | Money Market Funds | Goldman Sachs Financial Square Funds - Government Fund - Class SL
    
% of Partners' Capital   0.00%
Principal Amount   288
Market Values   288
Cash Equivalents | United States | Money Market Funds | Morgan Stanley Institutional Liquidity Fund - Government Portfolio
    
% of Partners' Capital 25.53% 30.87%
Principal Amount 11,510,274 11,503,853
Market Values 11,510,274 11,503,853
Cash Equivalents | United States | Money Market Funds | Wells Fargo Advantage Government Money Market Fund - Class I
    
% of Partners' Capital 22.19%  
Principal Amount 10,000,497  
Market Values 10,000,497  
Open Futures Contracts - Long | United States | ICE Brent Crude Oil Futures CO February 2013 contracts and February 2012 contracts, expiring January 2013 and expiring January 2012
    
Number of Contracts 406 347
Unrealized Gain Loss On Open Commodity Contracts $ 739,330 $ (916,570)
% of Partners' Capital 1.64% (2.46%)