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Schedule of Investments - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Cash Equivalents [Member]    
Market Value $ 78,785,251 $ 67,609,727
% of Partners' Capital 93.01% 91.83%
United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Market Value $ 55,785,251 $ 61,659,727
% of Partners' Capital 65.86% 83.75%
United States - Money Market Funds [Member] | United States [Member] | Cash Equivalents [Member]    
Market Value $ 23,000,000 $ 5,950,000
% of Partners' Capital 27.15% 8.08%
Fidelity Investments Money Market Funds Government Portfolio [Member] | United States - Money Market Funds [Member] | United States [Member] | Cash Equivalents [Member]    
Principal Amount $ 8,000,000 $ 150,000
Market Value $ 8,000,000 $ 150,000
% of Partners' Capital 9.44% 0.20%
Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member] | United States - Money Market Funds [Member] | United States [Member] | Cash Equivalents [Member]    
Principal Amount $ 10,000,000 $ 5,000,000
Market Value $ 10,000,000 $ 5,000,000
% of Partners' Capital 11.81% 6.79%
Morgan Stanley Institutional Liquidity Funds Government Portfolio [Member] | United States - Money Market Funds [Member] | United States [Member] | Cash Equivalents [Member]    
Principal Amount $ 5,000,000 $ 800,000
Market Value $ 5,000,000 $ 800,000
% of Partners' Capital 5.90% 1.09%
ICE Brent Crude Oil Futures CO March 2020 contracts, expiring January 2020 [Member] | Foreign Contracts [Member] | Open Futures Contracts Long [Member]    
Principal Amount [1] $ 83,516,390  
Number of Contracts [1] 1,283  
Value/Unrealized Gain (Loss) on Open Commodity Contracts [1] $ 1,161,610  
% of Partners' Capital [1] 1.37%  
ICE Brent Crude Oil Futures CO March 2019 contracts, expiring January 2019 | Foreign Contracts [Member] | Open Futures Contracts Long [Member]    
Principal Amount [2]   $ 79,887,910
Number of Contracts [2]   1,368
Value/Unrealized Gain (Loss) on Open Commodity Contracts [2]   $ (6,289,510)
% of Partners' Capital [2]   (8.54%)
U.S. Treasury Bills, 2.05%, 1/02/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,999,887  
% of Partners' Capital 2.36%  
U.S. Treasury Bills, 2.03%, 1/09/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 3,000,000  
Market Value $ 2,998,660  
% of Partners' Capital 3.54%  
U.S. Treasury Bills, 2.01%, 1/16/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,998,346  
% of Partners' Capital 2.36%  
U.S. Treasury Bills, 2.04%, 1/23/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,997,535  
% of Partners' Capital 2.36%  
U.S. Treasury Bills, 2.02%, 1/30/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,996,781  
% of Partners' Capital 2.36%  
U.S. Treasury Bills, 1.90%, 2/06/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,996,245  
% of Partners' Capital 2.36%  
U.S. Treasury Bills, 1.87%, 2/13/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,995,569  
% of Partners' Capital 2.36%  
U.S. Treasury Bills, 1.85%, 2/20/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 3,000,000  
Market Value $ 2,992,354  
% of Partners' Capital 3.53%  
U.S. Treasury Bills, 1.85%, 2/27/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 3,000,000  
Market Value $ 2,991,307  
% of Partners' Capital 3.53%  
U.S. Treasury Bills, 1.83%, 3/05/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 4,000,000  
Market Value $ 3,987,083  
% of Partners' Capital 4.71%  
U.S. Treasury Bills, 1.84%, 3/19/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 3,000,000  
Market Value $ 2,988,170  
% of Partners' Capital 3.53%  
U.S. Treasury Bills, 1.88%, 3/26/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,991,217  
% of Partners' Capital 2.35%  
U.S. Treasury Bills, 1.70%, 4/02/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,991,362  
% of Partners' Capital 2.35%  
U.S. Treasury Bills, 1.64%, 4/09/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 3,000,000  
Market Value $ 2,986,552  
% of Partners' Capital 3.53%  
U.S. Treasury Bills, 1.60%, 4/16/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 3,000,000  
Market Value $ 2,985,955  
% of Partners' Capital 3.52%  
U.S. Treasury Bills, 1.60%, 4/23/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,990,018  
% of Partners' Capital 2.35%  
U.S. Treasury Bills, 1.59%, 4/30/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,989,500  
% of Partners' Capital 2.35%  
U.S. Treasury Bills, 1.54%, 5/07/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,989,240  
% of Partners' Capital 2.35%  
U.S. Treasury Bills, 1.55%, 5/14/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 1,000,000  
Market Value $ 994,268  
% of Partners' Capital 1.17%  
U.S. Treasury Bills, 1.55%, 5/21/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,987,976  
% of Partners' Capital 2.35%  
U.S. Treasury Bills, 1.58%, 5/28/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,987,091  
% of Partners' Capital 2.35%  
U.S. Treasury Bills, 1.53%, 6/04/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 1,000,000  
Market Value $ 993,456  
% of Partners' Capital 1.17%  
U.S. Treasury Bills, 1.53%, 6/11/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,986,297  
% of Partners' Capital 2.34%  
U.S. Treasury Bills, 1.54%, 6/18/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,985,635  
% of Partners' Capital 2.34%  
U.S. Treasury Bills, 1.57%, 6/25/2020 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount $ 2,000,000  
Market Value $ 1,984,747  
% of Partners' Capital 2.34%  
Us Treasury Bills, 2.10%, 1/03/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 3,000,000
Market Value   $ 2,999,654
% of Partners' Capital   4.07%
Us Treasury Bills, 2.10%, 1/10/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 3,000,000
Market Value   $ 2,998,440
% of Partners' Capital   4.07%
Us Treasury Bills, 2.13%, 1/17/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 3,000,000
Market Value   $ 2,997,187
% of Partners' Capital   4.07%
Us Treasury Bills, 2.15%, 1/24/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 3,000,000
Market Value   $ 2,995,927
% of Partners' Capital   4.07%
Us Treasury Bills, 2.18%, 1/31/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 3,000,000
Market Value   $ 2,994,612
% of Partners' Capital   4.07%
Us Treasury Bills, 2.20%, 2/07/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 1,995,529
% of Partners' Capital   2.71%
Us Treasury Bills, 2.19%, 2/14/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 1,994,696
% of Partners' Capital   2.71%
Us Treasury Bills, 2.20%, 2/21/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 1,993,823
% of Partners' Capital   2.71%
Us Treasury Bills, 2.24%, 2/28/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 3,000,000
Market Value   $ 2,989,294
% of Partners' Capital   4.06%
Us Treasury Bills, 2.38%, 3/07/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 1,991,496
% of Partners' Capital   2.71%
Us Treasury Bills, 2.28%, 3/14/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 1,990,980
% of Partners' Capital   2.70%
Us Treasury Bills, 2.33%, 3/21/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 1,989,906
% of Partners' Capital   2.70%
Us Treasury Bills, 2.34%, 3/28/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 3,000,000
Market Value   $ 2,983,445
% of Partners' Capital   4.05%
Us Treasury Bills, 2.37%, 4/04/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 3,000,000
Market Value   $ 2,981,826
% of Partners' Capital   4.05%
Us Treasury Bills, 2.41%, 4/11/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 3,000,000
Market Value   $ 2,980,125
% of Partners' Capital   4.05%
Us Treasury Bills, 2.42%, 4/18/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 3,000,000
Market Value   $ 2,978,645
% of Partners' Capital   4.05%
Us Treasury Bills, 2.43%, 4/25/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 3,000,000
Market Value   $ 2,977,200
% of Partners' Capital   4.04%
Us Treasury Bills, 2.46%, 5/02/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 1,983,699
% of Partners' Capital   2.69%
Us Treasury Bills, 2.47%, 5/09/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 1,982,684
% of Partners' Capital   2.69%
Us Treasury Bills, 2.48%, 5/16/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 1,000,000
Market Value   $ 990,813
% of Partners' Capital   1.35%
Us Treasury Bills, 2.50%, 5/23/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 1,980,554
% of Partners' Capital   2.69%
Us Treasury Bills, 2.49%, 5/30/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 1,979,657
% of Partners' Capital   2.69%
Us Treasury Bills, 2.51%, 6/06/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 1,978,550
% of Partners' Capital   2.69%
Us Treasury Bills, 2.51%, 6/13/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 3,000,000
Market Value   $ 2,966,313
% of Partners' Capital   4.03%
Us Treasury Bills, 2.49%, 6/20/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 1,976,767
% of Partners' Capital   2.69%
Us Treasury Bills, 2.49%, 6/27/2019 | United States Treasury Obligations [Member] | Cash Equivalents [Member]    
Principal Amount   $ 1,000,000
Market Value   $ 987,905
% of Partners' Capital   1.34%
[1] Collateral amounted to $10,877,607 on open futures contracts.
[2] Collateral amounted to $17,417,768 on open futures contracts.