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Schedule of Investments
Dec. 31, 2017
USD ($)
Contracts
Dec. 31, 2016
USD ($)
Contracts
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 11,072,567 $ 17,277,775
Open Futures Contracts, Long | United States    
Notional Amount $ 80,457,383 [1] $ 109,140,895 [2]
Number of Contracts | Contracts 1,541 [1] 2,247 [2]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 11,072,567 [1] $ 17,277,775 [2]
% of Partners' Capital 12.09% [1] 13.67% [2]
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL February 2017 contracts, expiring January 2017 [Member]    
Notional Amount   $ 7,985,714
Number of Contracts | Contracts   187
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 2,059,926
% of Partners' Capital   1.63%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL March 2017 contracts, expiring February 2017 [Member]    
Notional Amount   $ 7,796,614
Number of Contracts | Contracts   187
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 2,424,806
% of Partners' Capital   1.92%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL April 2017 contracts, expiring March 2017 [Member]    
Notional Amount   $ 8,487,399
Number of Contracts | Contracts   188
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 1,933,441
% of Partners' Capital   1.53%
Open Futures Contracts, Long | United States | Nymex Wti Crude Oil Futures CL May 2017 Contracts Expiring April 2017 [Member]    
Notional Amount   $ 8,052,053
Number of Contracts | Contracts   187
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 2,429,297
% of Partners' Capital   1.92%
Open Futures Contracts, Long | United States | Nymex Wti Crude Oil Futures CL June 2017 Contracts Expiring May 2017 [Member]    
Notional Amount   $ 8,988,898
Number of Contracts | Contracts   187
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 1,574,732
% of Partners' Capital   1.25%
Open Futures Contracts, Long | United States | Nymex Wti Crude Oil Futures CL July 2017 Contracts Expiring June 2017 [Member]    
Notional Amount   $ 9,887,588
Number of Contracts | Contracts   187
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 726,532
% of Partners' Capital   0.57%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL August 2017 contracts, expiring July 2017 [Member]    
Notional Amount   $ 9,816,015
Number of Contracts | Contracts   188
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 881,185
% of Partners' Capital   0.70%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL September 2017 contracts, expiring August 2017 [Member]    
Notional Amount   $ 9,032,387
Number of Contracts | Contracts   187
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 1,624,743
% of Partners' Capital   1.29%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL October 2017 contracts, expiring September 2017 [Member]    
Notional Amount   $ 9,350,103
Number of Contracts | Contracts   188
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 1,371,537
% of Partners' Capital   1.08%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL November 2017 contracts, expiring October 2017 [Member]    
Notional Amount   $ 10,141,885
Number of Contracts | Contracts   187
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 526,465
% of Partners' Capital   0.42%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL December 2017 contracts, expiring November 2017 [Member]    
Notional Amount   $ 9,325,814
Number of Contracts | Contracts   187
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 1,344,406
% of Partners' Capital   1.06%
Open Futures Contracts, Long | United States | NYMEX WTI Crude Oil Futures CL January 2018 contracts, expiring December 2017 [Member]    
Notional Amount   $ 10,276,425
Number of Contracts | Contracts   187
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 380,705
% of Partners' Capital   0.30%
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 | 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 | 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 | 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    
Notional Amount $ 6,794,910  
Number of Contracts | 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    
Notional Amount $ 6,303,144  
Number of Contracts | 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    
Notional Amount $ 6,265,669  
Number of Contracts | 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 | 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 | 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 | 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 | 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 | 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 | Contracts 128  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 328,033  
% of Partners' Capital 0.36%  
Cash Equivalents | United States    
Market Value $ 85,783,036 $ 106,896,715
% of Partners' Capital 93.70% 84.58%
Cash Equivalents | United States | US Treasury Securities    
Market Value $ 66,783,036 $ 69,896,715
% of Partners' Capital 72.95% 55.30%
Cash Equivalents | United States | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | 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 | US Treasury Securities | US Treasury Bills 0.34%, 1/05/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,999,887
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.43%, 1/19/2017    
Principal Amount   $ 1,000,000
Market Value   $ 999,787
% of Partners' Capital   0.79%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.36%, 1/26/2017    
Principal Amount   $ 4,000,000
Market Value   $ 3,999,000
% of Partners' Capital   3.16%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.40%, 2/02/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,998,933
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.42%, 2/09/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,999,090
% of Partners' Capital   1.58%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.45%, 2/16/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,998,275
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.45%, 2/23/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,998,690
% of Partners' Capital   1.58%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.45%, 3/02/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,998,500
% of Partners' Capital   1.58%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.47%, 3/09/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,997,376
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.50%, 3/16/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,996,901
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.45%, 3/23/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,997,997
% of Partners' Capital   1.58%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.43%, 3/30/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,996,847
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.46%, 4/06/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,996,398
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.47%, 4/13/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,996,005
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.46%, 4/20/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,995,867
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.47%, 4/27/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,995,505
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.49%, 5/04/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,994,952
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.55%, 5/11/2017    
Principal Amount   $ 2,000,000
Market Value   $ 1,996,064
% of Partners' Capital   1.58%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.60%, 5/18/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,993,207
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.61%, 5/25/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,992,710
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.60%, 6/01/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,992,513
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.62%, 6/08/2017    
Principal Amount   $ 4,000,000
Market Value   $ 3,989,203
% of Partners' Capital   3.16%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.65%, 6/15/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,991,131
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.64%, 6/22/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,990,827
% of Partners' Capital   2.37%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bills 0.60%, 6/29/2017    
Principal Amount   $ 3,000,000
Market Value   $ 2,991,050
% of Partners' Capital   2.37%
Cash Equivalents | United States | Money Market Funds    
Market Value $ 19,000,000 $ 37,000,000
% of Partners' Capital 20.75% 29.28%
Cash Equivalents | United States | Money Market Funds | Fidelity Investments Money Market Funds - Government Portfolio [Member]    
Principal Amount $ 10,000,000 $ 18,000,000
Market Value $ 10,000,000 $ 18,000,000
% of Partners' Capital 10.92% 14.24%
Cash Equivalents | United States | Money Market Funds | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]    
Principal Amount $ 2,000,000 $ 10,000,000
Market Value $ 2,000,000 $ 10,000,000
% of Partners' Capital 2.18% 7.91%
Cash Equivalents | United States | Money Market Funds | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]    
Principal Amount $ 7,000,000 $ 7,000,000
Market Value $ 7,000,000 $ 7,000,000
% of Partners' Capital 7.65% 5.54%
Cash Equivalents | United States | Money Market Funds | Wells Fargo Advantage Government Money Market Fund - Class I [Member]    
Principal Amount   $ 2,000,000
Market Value   $ 2,000,000
% of Partners' Capital   1.59%
[1] Collateral amounted to $4,988,459 on open futures contracts.
[2] Collateral amounted to $6,997,275 on open futures contracts.