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Schedule of Investments
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (15,772,193) $ 11,072,567
Open Futures Contracts, Long | United States    
Notional Amount $ 66,525,613 [1] $ 80,457,383 [2]
Number of Contracts 1,075 [1] 1,541 [2]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (15,772,193) [1] $ 11,072,567 [2]
% of Partners' Capital (31.05%) [1] 12.09% [2]
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL February 2018 contracts expiring January 2018 [Member]    
Notional Amount   $ 7,342,003
Number of Contracts   128
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 391,757
% of Partners' Capital   0.43%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL March 2018 contracts expiring February 2018 [Member]    
Notional Amount   $ 6,996,738
Number of Contracts   128
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 739,582
% of Partners' Capital   0.81%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL April 2018 contracts expiring March 2018 [Member]    
Notional Amount   $ 7,029,919
Number of Contracts   129
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 761,681
% of Partners' Capital   0.83%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL May 2018 contracts expiring April 2018 [Member]    
Notional Amount   $ 6,794,910
Number of Contracts   128
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 919,650
% of Partners' Capital   1.00%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL June 2018 contracts expiring May 2018 [Member]    
Notional Amount   $ 6,303,144
Number of Contracts   129
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 1,444,596
% of Partners' Capital   1.58%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL July 2018 contracts expiring June 2018 [Member]    
Notional Amount   $ 6,265,669
Number of Contracts   128
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 1,383,611
% of Partners' Capital   1.51%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL August 2018 contracts expiring July 2018 [Member]    
Notional Amount   $ 6,164,549
Number of Contracts   129
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 1,500,631
% of Partners' Capital   1.64%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL September 2018 contracts expiring August 2018 [Member]    
Notional Amount   $ 6,396,250
Number of Contracts   128
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 1,164,710
% of Partners' Capital   1.27%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL October 2018 contracts expiring September 2018 [Member]    
Notional Amount   $ 6,563,654
Number of Contracts   129
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 1,011,226
% of Partners' Capital   1.10%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL November 2018 contracts expiring October 2018 [Member]    
Notional Amount   $ 6,435,609
Number of Contracts   128
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 1,037,031
% of Partners' Capital   1.13%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL December 2018 contracts expiring November 2018 [Member]    
Notional Amount   $ 7,100,971
Number of Contracts   129
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 390,059
% of Partners' Capital   0.43%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL January 2019 contracts expiring December 2018 [Member]    
Notional Amount   $ 7,063,967
Number of Contracts   128
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 328,033
% of Partners' Capital   0.36%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL February 2019 contracts expiring January 2019 [Member]    
Notional Amount $ 5,244,465  
Number of Contracts 89  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (1,202,975)  
% of Partners' Capital (2.37%)  
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL March 2019 contracts expiring February 2019 [Member]    
Notional Amount $ 5,170,252  
Number of Contracts 89  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (1,101,172)  
% of Partners' Capital (2.17%)  
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL April 2019 contracts expiring March 2019 [Member]    
Notional Amount $ 5,208,408  
Number of Contracts 90  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (1,061,208)  
% of Partners' Capital (2.09%)  
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL May 2019 contracts expiring April 2019    
Notional Amount $ 5,272,457  
Number of Contracts 90  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (1,086,557)  
% of Partners' Capital (2.14%)  
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL June 2019 contracts expiring May 2019    
Notional Amount $ 5,639,096  
Number of Contracts 89  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (1,462,326)  
% of Partners' Capital (2.88%)  
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL July 2019 contracts expiring June 2019    
Notional Amount $ 5,596,407  
Number of Contracts 90  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (1,339,407)  
% of Partners' Capital (2.64%)  
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL August 2019 contracts expiring July 2019 [Member]    
Notional Amount $ 5,833,274  
Number of Contracts 90  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (1,549,274)  
% of Partners' Capital (3.05%)  
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL September 2019 contracts expiring August 2019 [Member]    
Notional Amount $ 5,764,737  
Number of Contracts 89  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (1,506,977)  
% of Partners' Capital (2.97%)  
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL October 2019 contracts expiring September 2019 [Member]    
Notional Amount $ 5,834,893  
Number of Contracts 90  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (1,511,293)  
% of Partners' Capital (2.97%)  
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL November 2019 contracts expiring October 2019 [Member]    
Notional Amount $ 6,485,864  
Number of Contracts 90  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (2,146,064)  
% of Partners' Capital (4.22%)  
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL December 2019 contracts expiring November 2019 [Member]    
Notional Amount $ 5,663,730  
Number of Contracts 89  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (1,357,910)  
% of Partners' Capital (2.67%)  
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL January 2020 contracts expiring December 2019 [Member]    
Notional Amount $ 4,812,030  
Number of Contracts 90  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (447,030)  
% of Partners' Capital (0.88%)  
Cash Equivalents    
Market Value   $ 85,783,036
% of Partners' Capital   93.70%
Cash Equivalents | United States Treasury Obligations    
Market Value $ 46,760,361 $ 66,783,036
% of Partners' Capital 92.05% 72.95%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.10%, 1/03/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,999,654  
% of Partners' Capital 5.90%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.10%, 1/10/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,998,960  
% of Partners' Capital 3.94%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.13%, 1/17/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,998,124  
% of Partners' Capital 3.93%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.15%, 1/24/2019    
Principal Amount $ 3,000,000  
Market Value $ 2,995,927  
% of Partners' Capital 5.90%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.18%, 1/31/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,996,408  
% of Partners' Capital 3.93%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.20%, 2/07/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,995,529  
% of Partners' Capital 3.93%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.19%, 2/14/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,994,696  
% of Partners' Capital 3.93%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.20%, 2/21/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,993,823  
% of Partners' Capital 3.92%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.24%, 2/28/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,992,863  
% of Partners' Capital 3.92%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.38%, 3/07/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,991,496  
% of Partners' Capital 3.92%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.28%, 3/14/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,990,980  
% of Partners' Capital 3.92%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.33%, 3/21/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,989,906  
% of Partners' Capital 3.92%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.34%, 3/28/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,988,963  
% of Partners' Capital 3.92%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.37%, 4/04/2019    
Principal Amount $ 1,000,000  
Market Value $ 993,942  
% of Partners' Capital 1.96%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.41%, 4/11/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,986,750  
% of Partners' Capital 3.91%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.42%, 4/18/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,985,763  
% of Partners' Capital 3.91%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.43%, 4/25/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,984,800  
% of Partners' Capital 3.91%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.46%, 5/02/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,983,699  
% of Partners' Capital 3.90%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.47%, 5/09/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,982,684  
% of Partners' Capital 3.90%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.48%, 5/16/2019    
Principal Amount $ 1,000,000  
Market Value $ 990,813  
% of Partners' Capital 1.95%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.50%, 5/23/2019    
Principal Amount $ 1,000,000  
Market Value $ 990,277  
% of Partners' Capital 1.95%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.49%, 5/30/2019    
Principal Amount $ 1,000,000  
Market Value $ 989,829  
% of Partners' Capital 1.95%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.51%, 6/06/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,978,550  
% of Partners' Capital 3.89%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.51%, 6/13/2019    
Principal Amount $ 2,000,000  
Market Value $ 1,977,542  
% of Partners' Capital 3.89%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 2.49%, 6/20/2019    
Principal Amount $ 1,000,000  
Market Value $ 988,383  
% of Partners' Capital 1.95%  
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.12%, 1/04/2018    
Principal Amount   $ 3,000,000
Market Value   $ 2,999,721
% of Partners' Capital   3.28%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.11%, 1/11/2018    
Principal Amount   $ 3,000,000
Market Value   $ 2,999,079
% of Partners' Capital   3.28%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.10%, 1/18/2018    
Principal Amount   $ 3,000,000
Market Value   $ 2,998,456
% of Partners' Capital   3.27%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.12%, 1/25/2018    
Principal Amount   $ 4,000,000
Market Value   $ 3,997,027
% of Partners' Capital   4.37%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.12%, 2/01/2018    
Principal Amount   $ 3,000,000
Market Value   $ 2,997,120
% of Partners' Capital   3.27%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.13%, 2/08/2018    
Principal Amount   $ 2,000,000
Market Value   $ 1,997,625
% of Partners' Capital   2.18%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.12%, 2/15/2018    
Principal Amount   $ 3,000,000
Market Value   $ 2,995,837
% of Partners' Capital   3.27%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.10%, 2/22/2018    
Principal Amount   $ 3,000,000
Market Value   $ 2,995,277
% of Partners' Capital   3.27%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.09%, 3/01/2018    
Principal Amount   $ 3,000,000
Market Value   $ 2,994,665
% of Partners' Capital   3.27%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.14%, 3/08/2018    
Principal Amount   $ 2,000,000
Market Value   $ 1,995,847
% of Partners' Capital   2.18%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.14%, 3/15/2018    
Principal Amount   $ 2,000,000
Market Value   $ 1,995,417
% of Partners' Capital   2.18%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.16%, 3/22/2018    
Principal Amount   $ 2,000,000
Market Value   $ 1,994,889
% of Partners' Capital   2.18%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.17%, 3/29/2018    
Principal Amount   $ 2,000,000
Market Value   $ 1,994,393
% of Partners' Capital   2.18%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.19%, 4/05/2018    
Principal Amount   $ 2,000,000
Market Value   $ 1,993,812
% of Partners' Capital   2.18%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.22%, 4/12/2018    
Principal Amount   $ 2,000,000
Market Value   $ 1,993,182
% of Partners' Capital   2.18%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.23%, 4/19/2018    
Principal Amount   $ 2,000,000
Market Value   $ 1,992,695
% of Partners' Capital   2.18%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.25%, 4/26/2018    
Principal Amount   $ 2,000,000
Market Value   $ 1,992,078
% of Partners' Capital   2.18%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.27%, 5/03/2018    
Principal Amount   $ 2,000,000
Market Value   $ 1,991,460
% of Partners' Capital   2.17%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.32%, 5/10/2018    
Principal Amount   $ 2,000,000
Market Value   $ 1,990,612
% of Partners' Capital   2.17%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.37%, 5/17/2018    
Principal Amount   $ 3,000,000
Market Value   $ 2,984,615
% of Partners' Capital   3.26%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.43%, 5/24/2018    
Principal Amount   $ 2,000,000
Market Value   $ 1,988,759
% of Partners' Capital   2.17%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.43%, 5/31/2018    
Principal Amount   $ 3,000,000
Market Value   $ 2,982,250
% of Partners' Capital   3.26%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.45%, 6/07/2018    
Principal Amount   $ 3,000,000
Market Value   $ 2,981,160
% of Partners' Capital   3.26%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.46%, 6/14/2018    
Principal Amount   $ 3,000,000
Market Value   $ 2,980,252
% of Partners' Capital   3.26%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.49%, 6/21/2018    
Principal Amount   $ 3,000,000
Market Value   $ 2,978,910
% of Partners' Capital   3.25%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills 1.50%, 6/28/2018    
Principal Amount   $ 3,000,000
Market Value   $ 2,977,898
% of Partners' Capital   3.25%
Cash Equivalents | United States | United States - Money Market Funds    
Market Value   $ 19,000,000
% of Partners' Capital   20.75%
Cash Equivalents | United States | United States - Money Market Funds | Fidelity Investments Money Market Funds - Government Portfolio [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 10,000,000
% of Partners' Capital   10.92%
Cash Equivalents | United States | United States - Money Market Funds | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 2,000,000
% of Partners' Capital   2.18%
Cash Equivalents | United States | United States - Money Market Funds | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]    
Principal Amount   $ 7,000,000
Market Value   $ 7,000,000
% of Partners' Capital   7.65%
[1] Collateral amounted to $24,000,253 on open futures contracts.
[2] Collateral amounted to $4,988,459 on open futures contracts.