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Schedule of Investments
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Cash Equivalents [Member]    
Market Value $ 67,609,727 $ 82,786,902
% of Partners' Capital 91.83% 87.56%
Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Market Value $ 61,659,727 $ 62,786,902
% of Partners' Capital 83.75% 66.41%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.10%, 1/03/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,999,654  
% of Partners' Capital 4.07%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.10%, 1/10/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,998,440  
% of Partners' Capital 4.07%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.13%, 1/17/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,997,187  
% of Partners' Capital 4.07%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.15%, 1/24/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,995,927  
% of Partners' Capital 4.07%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.18%, 1/31/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,994,612  
% of Partners' Capital 4.07%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.20%, 2/07/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,995,529  
% of Partners' Capital 2.71%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.19%, 2/14/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,994,696  
% of Partners' Capital 2.71%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.20%, 2/21/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,993,823  
% of Partners' Capital 2.71%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.24%, 2/28/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,989,294  
% of Partners' Capital 4.06%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.38%, 3/07/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,991,496  
% of Partners' Capital 2.71%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.28%, 3/14/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,990,980  
% of Partners' Capital 2.70%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.33%, 3/21/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,989,906  
% of Partners' Capital 2.70%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.34%, 3/28/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,983,445  
% of Partners' Capital 4.05%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.37%, 4/04/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,981,826  
% of Partners' Capital 4.05%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.41%, 4/11/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,980,125  
% of Partners' Capital 4.05%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.42%, 4/18/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,978,645  
% of Partners' Capital 4.05%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.43%, 4/25/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,977,200  
% of Partners' Capital 4.04%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.46%, 5/02/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,983,699  
% of Partners' Capital 2.69%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.47%, 5/09/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,982,684  
% of Partners' Capital 2.69%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.48%, 5/16/2019    
Principal Amount $ 1,000,000  
Market Value $ 990,813  
% of Partners' Capital 1.35%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.50%, 5/23/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,980,554  
% of Partners' Capital 2.69%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.49%, 5/30/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,979,657  
% of Partners' Capital 2.69%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.51%, 6/06/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,978,550  
% of Partners' Capital 2.69%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.51%, 6/13/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,966,313  
% of Partners' Capital 4.03%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.49%, 6/20/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,976,767  
% of Partners' Capital 2.69%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills,2.49%, 6/27/2019    
Principal Amount $ 1,000,000  
Market Value $ 987,905  
% of Partners' Capital 1.34%  
Cash Equivalents [Member] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States Treasury Obligations [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] | United States [Member] | United States - Money Market Funds [Member]    
Market Value $ 5,950,000 $ 20,000,000
% of Partners' Capital 8.08% 21.15%
Cash Equivalents [Member] | United States [Member] | United States - Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]    
Principal Amount $ 150,000 $ 12,000,000
Market Value $ 150,000 $ 12,000,000
% of Partners' Capital 0.20% 12.69%
Cash Equivalents [Member] | United States [Member] | United States - Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]    
Principal Amount $ 5,000,000 $ 3,000,000
Market Value $ 5,000,000 $ 3,000,000
% of Partners' Capital 6.79% 3.17%
Cash Equivalents [Member] | United States [Member] | United States - Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]    
Principal Amount $ 800,000 $ 5,000,000
Market Value $ 800,000 $ 5,000,000
% of Partners' Capital 1.09% 5.29%
Open Futures Contracts - Long [Member] | Foreign Contracts [Member] | ICE Brent Crude Oil Futures CO March 2019 contracts, expiring January 2019 [Member]    
Principal Amount [1] $ 79,887,910  
Number of Contracts [1] 1,368  
Value/Unrealized Gain (Loss) on Open Commodity Contracts [1] $ (6,289,510)  
% of Partners' Capital [1] (8.54%)  
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 $17,417,768 on open futures contracts.
[2] Collateral amounted to $14,167,416 on open futures contracts.