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Condensed Schedule of Investments (USD $)
Jun. 30, 2013
Cash Equivalents [Member]
  
% of Partners' Capital 72.56%
Market Values $ 28,215,266
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bill [Member]
  
% of Partners' Capital 5.66%
Principal Amount 2,200,000
Market Values 2,199,476
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member]
  
% of Partners' Capital 66.90%
Market Values 26,015,790
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Fidelity Institutional Government Portfolio - Class I [Member]
  
% of Partners' Capital 1.29%
Principal Amount 502,749
Market Values 502,749
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]
  
% of Partners' Capital 10.29%
Principal Amount 4,002,270
Market Values 4,002,270
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Fund - Government Portfolio [Member]
  
% of Partners' Capital 29.60%
Principal Amount 11,510,274
Market Values 11,510,274
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Wells Fargo Advantage Government Money Market Fund - Class I [Member]
  
% of Partners' Capital 25.72%
Principal Amount 10,000,498
Market Values 10,000,497
Open Futures Contracts - Long [Member] | United States [Member] | ICE Brent Crude Oil Futures CO August 2013 contracts, expiring July 2013
  
Number of Contracts 381 [1]
Unrealized Gain Loss On Open Commodity Contracts $ 192,090 [1]
% of Partners' Capital 0.49% [1]
[1] Collateral amounted to $2,861,454 on open futures contracts