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Schedule of Investments - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Cash Equivalents [Member] | US Treasury Securities [Member]    
Market Value $ 62,786,902 $ 61,899,767
% of Partners' Capital 66.41% 54.77%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.12%, 1/04/2018    
Principal Amount $ 3,000,000  
Market Value $ 2,999,721  
% of Partners' Capital 3.17%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.11%, 1/11/2018    
Principal Amount $ 3,000,000  
Market Value $ 2,999,079  
% of Partners' Capital 3.17%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.10%, 1/18/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,998,971  
% of Partners' Capital 2.12%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.12%, 1/25/2018    
Principal Amount $ 3,000,000  
Market Value $ 2,997,770  
% of Partners' Capital 3.17%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.12%, 2/01/2018    
Principal Amount $ 3,000,000  
Market Value $ 2,997,120  
% of Partners' Capital 3.17%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.13%, 2/08/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,997,625  
% of Partners' Capital 2.11%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.12%, 2/15/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,997,225  
% of Partners' Capital 2.11%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.10%, 2/22/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,996,851  
% of Partners' Capital 2.11%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.09%, 3/01/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,996,444  
% of Partners' Capital 2.11%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.14%, 3/08/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,995,847  
% of Partners' Capital 2.11%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.14%, 3/15/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,995,417  
% of Partners' Capital 2.11%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.16%, 3/22/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,994,889  
% of Partners' Capital 2.11%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.17%, 3/29/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,994,393  
% of Partners' Capital 2.11%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.19%, 4/05/2018    
Principal Amount $ 3,000,000  
Market Value $ 2,990,718  
% of Partners' Capital 3.16%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.22%, 4/12/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,993,182  
% of Partners' Capital 2.11%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.23%, 4/19/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,992,695  
% of Partners' Capital 2.11%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.25%, 4/26/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,992,078  
% of Partners' Capital 2.11%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.27%, 5/03/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,991,460  
% of Partners' Capital 2.11%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.32%, 5/10/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,990,612  
% of Partners' Capital 2.11%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.37%, 5/17/2018    
Principal Amount $ 3,000,000  
Market Value $ 2,984,615  
% of Partners' Capital 3.16%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.43%, 5/24/2018    
Principal Amount $ 3,000,000  
Market Value $ 2,983,138  
% of Partners' Capital 3.16%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.43%, 5/31/2018    
Principal Amount $ 3,000,000  
Market Value $ 2,982,250  
% of Partners' Capital 3.15%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.45%, 6/07/2018    
Principal Amount $ 3,000,000  
Market Value $ 2,981,160  
% of Partners' Capital 3.15%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.46%, 6/14/2018    
Principal Amount $ 2,000,000  
Market Value $ 1,986,834  
% of Partners' Capital 2.10%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.49%, 6/21/2018    
Principal Amount $ 3,000,000  
Market Value $ 2,978,910  
% of Partners' Capital 3.15%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,1.50%, 6/28/2018    
Principal Amount $ 3,000,000  
Market Value $ 2,977,898  
% of Partners' Capital 3.15%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.34%, 1/05/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,999,924
% of Partners' Capital   1.77%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.43%, 1/19/2017    
Principal Amount   $ 1,000,000
Market Value   $ 999,788
% of Partners' Capital   0.88%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.40%, 2/02/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,999,289
% of Partners' Capital   1.77%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.42%, 2/09/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,999,090
% of Partners' Capital   1.77%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.45%, 2/16/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,998,850
% of Partners' Capital   1.77%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.45%, 2/23/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,998,690
% of Partners' Capital   1.77%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.45%, 3/02/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,998,500
% of Partners' Capital   1.77%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.47%, 3/09/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,997,376
% of Partners' Capital   2.65%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.50%, 3/16/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,997,934
% of Partners' Capital   1.77%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.45%, 3/23/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,996,996
% of Partners' Capital   2.65%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.43%, 3/30/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,997,898
% of Partners' Capital   1.77%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.46%, 4/06/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,996,398
% of Partners' Capital   2.65%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.47%, 4/13/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,996,005
% of Partners' Capital   2.65%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.46%, 4/20/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,995,867
% of Partners' Capital   2.65%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.47%, 4/27/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,995,505
% of Partners' Capital   2.65%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.49%, 5/04/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,994,952
% of Partners' Capital   2.65%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.55%, 5/11/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,996,064
% of Partners' Capital   1.76%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.60%, 5/18/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,993,207
% of Partners' Capital   2.65%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.61%, 5/25/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,992,710
% of Partners' Capital   2.65%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.60%, 6/01/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,992,513
% of Partners' Capital   2.65%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.62%, 6/08/2017    
Principal Amount   $ 4,000,000
Market Value   $ 3,989,203
% of Partners' Capital   3.53%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.65%, 6/15/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,991,131
% of Partners' Capital   2.65%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.64%, 6/22/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,990,827
% of Partners' Capital   2.64%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills,0.60%, 6/29/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,991,050
% of Partners' Capital   2.65%
Cash Equivalents [Member] | United States [Member]    
Market Value $ 82,786,902 $ 96,899,767
% of Partners' Capital 87.56% 85.73%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member]    
Market Value $ 20,000,000 $ 35,000,000
% of Partners' Capital 21.15% 30.96%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]    
Principal Amount $ 12,000,000 $ 16,000,000
Market Value $ 12,000,000 $ 16,000,000
% of Partners' Capital 12.69% 14.15%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]    
Principal Amount $ 3,000,000 $ 12,000,000
Market Value $ 3,000,000 $ 12,000,000
% of Partners' Capital 3.17% 10.62%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]    
Principal Amount $ 5,000,000 $ 7,000,000
Market Value $ 5,000,000 $ 7,000,000
% of Partners' Capital 5.29% 6.19%
Open Futures Contracts - Long [Member] | Foreign Contracts [Member] | ICE Brent Crude Oil Futures CO March 2017 contracts, expiring January 2017 [Member]    
Principal Amount [1]   $ 110,682,100
Number of Contracts [1]   1,989
Value/Unrealized Gain (Loss) on Open Commodity Contracts [1]   $ 2,332,880
% of Partners' Capital [1]   2.06%
Open Futures Contracts - Long [Member] | Foreign Contracts [Member] | ICE Brent Crude Oil Futures CO March 2018 contracts, expiring January 2018 [Member]    
Principal Amount [2] $ 88,966,270  
Number of Contracts [2] 1,414  
Value/Unrealized Gain (Loss) on Open Commodity Contracts [2] $ 5,587,910  
% of Partners' Capital [2] 5.91%  
[1] Collateral amounted to $8,297,821 on open futures contracts.
[2] Collateral amounted to $14,167,416 on open futures contracts.