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Schedule of Investments
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (67,021,257) $ 55,721,680
Open Futures Contracts - Long [Member] | United States [Member]    
Notional Amount $ 315,010,257 [1] $ 596,359,780 [2]
Number of Contracts 12,935 [1] 37,082 [2]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (67,021,257) [1] $ 55,721,680 [2]
% of Partners' Capital (27.02%) [1] 8.55% [2]
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG February 2019 contracts, expiring January 2019 [Member]    
Notional Amount $ 259,275,882  
Number of Contracts 6,935  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (55,386,882)  
% of Partners' Capital (22.33%)  
Open Futures Contracts - Long [Member] | United States [Member] | ICE Natural Gas Futures LD1 H February 2019 contracts, expiring February 2019 [Member]    
Notional Amount $ 55,734,375  
Number of Contracts 6,000  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (11,634,375)  
% of Partners' Capital (4.69%)  
Open Futures Contracts - Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG February 2018 contracts, expiring January 2018 [Member]    
Notional Amount   $ 461,049,780
Number of Contracts   17,082
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 43,381,680
% of Partners' Capital   6.66%
Open Futures Contracts - Long [Member] | United States [Member] | ICE Natural Gas Futures LD1 H February 2018 contracts, expiring February 2018 [Member]    
Notional Amount   $ 135,310,000
Number of Contracts   20,000
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 12,340,000
% of Partners' Capital   1.89%
Cash Equivalents [Member]    
Market Value $ 272,193,228 $ 483,194,474
% of Partners' Capital 109.75% 74.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Market Value $ 238,493,228 $ 463,194,474
% of Partners' Capital 96.16% 71.04%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.10%, 1/03/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,998,847  
% of Partners' Capital 4.03%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.10%, 1/10/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,994,800  
% of Partners' Capital 4.03%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.13%, 1/17/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,990,622  
% of Partners' Capital 4.03%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.15%, 1/24/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,986,423  
% of Partners' Capital 4.03%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.18%, 1/31/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,982,042  
% of Partners' Capital 4.02%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.20%, 2/07/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,977,646  
% of Partners' Capital 4.02%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.20%, 2/21/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,969,117  
% of Partners' Capital 4.02%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.38%, 3/07/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,957,479  
% of Partners' Capital 4.01%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.28%, 3/14/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,954,900  
% of Partners' Capital 4.01%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.33%, 3/21/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,949,528  
% of Partners' Capital 4.01%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.34%, 3/28/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,944,817  
% of Partners' Capital 4.01%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.37%, 4/04/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,939,421  
% of Partners' Capital 4.01%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.41%, 4/11/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,933,750  
% of Partners' Capital 4.01%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.42%, 4/18/2019 [Member]    
Principal Amount $ 5,000,000  
Market Value $ 4,964,408  
% of Partners' Capital 2.00%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.43%, 4/25/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,924,000  
% of Partners' Capital 4.00%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.47%, 5/09/2019 [Member]    
Principal Amount $ 15,000,000  
Market Value $ 14,870,133  
% of Partners' Capital 6.00%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.48%, 5/16/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,908,125  
% of Partners' Capital 3.99%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.50%, 5/23/2019 [Member]    
Principal Amount $ 20,000,000  
Market Value $ 19,805,539  
% of Partners' Capital 7.99%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.49%, 5/30/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,898,287  
% of Partners' Capital 3.99%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.51%, 6/06/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,892,750  
% of Partners' Capital 3.99%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.51%, 6/13/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,887,711  
% of Partners' Capital 3.99%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.49%, 6/20/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,883,833  
% of Partners' Capital 3.99%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.49%, 6/27/2019 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,879,050  
% of Partners' Capital 3.98%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 1/04/2018 [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 9,999,071
% of Partners' Capital   1.53%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.11%, 1/11/2018 [Member]    
Principal Amount   $ 15,000,000
Market Value   $ 14,995,396
% of Partners' Capital   2.30%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.10%, 1/18/2018 [Member]    
Principal Amount   $ 15,000,000
Market Value   $ 14,992,279
% of Partners' Capital   2.30%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 1/25/2018 [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 9,992,567
% of Partners' Capital   1.53%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 2/01/2018 [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 9,990,399
% of Partners' Capital   1.53%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.13%, 2/08/2018 [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 9,988,125
% of Partners' Capital   1.53%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 2/15/2018 [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 9,986,125
% of Partners' Capital   1.53%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.10%, 2/22/2018 [Member]    
Principal Amount   $ 15,000,000
Market Value   $ 14,976,383
% of Partners' Capital   2.30%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.09%, 3/01/2018 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,964,436
% of Partners' Capital   3.06%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.14%, 3/08/2018 [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 9,979,237
% of Partners' Capital   1.53%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.14%, 3/15/2018 [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 9,977,086
% of Partners' Capital   1.53%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.16%, 3/22/2018 [Member]    
Principal Amount   $ 15,000,000
Market Value   $ 14,961,667
% of Partners' Capital   2.30%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.17%, 3/29/2018 [Member]    
Principal Amount   $ 15,000,000
Market Value   $ 14,957,950
% of Partners' Capital   2.29%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.19%, 4/05/2018 [Member]    
Principal Amount   $ 25,000,000
Market Value   $ 24,922,646
% of Partners' Capital   3.82%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.22%, 4/12/2018 [Member]    
Principal Amount   $ 25,000,000
Market Value   $ 24,914,781
% of Partners' Capital   3.82%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.23%, 4/19/2018 [Member]    
Principal Amount   $ 25,000,000
Market Value   $ 24,908,687
% of Partners' Capital   3.82%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.25%, 4/26/2018 [Member]    
Principal Amount   $ 25,000,000
Market Value   $ 24,900,972
% of Partners' Capital   3.82%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.27%, 5/03/2018 [Member]    
Principal Amount   $ 15,000,000
Market Value   $ 14,935,950
% of Partners' Capital   2.29%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.32%, 5/10/2018 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,906,117
% of Partners' Capital   3.05%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.37%, 5/17/2018 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,897,433
% of Partners' Capital   3.05%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 5/24/2018 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,887,586
% of Partners' Capital   3.05%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 5/31/2018 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,881,667
% of Partners' Capital   3.05%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.45%, 6/07/2018 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,874,400
% of Partners' Capital   3.05%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.46%, 6/14/2018 [Member]    
Principal Amount   $ 25,000,000
Market Value   $ 24,835,431
% of Partners' Capital   3.82%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.49%, 6/21/2018 [Member]    
Principal Amount   $ 30,000,000
Market Value   $ 29,789,100
% of Partners' Capital   4.57%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.50%, 6/28/2018 [Member]    
Principal Amount   $ 30,000,000
Market Value   $ 29,778,983
% of Partners' Capital   4.57%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member]    
Market Value $ 33,700,000 $ 20,000,000
% of Partners' Capital 13.59% 3.06%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]    
Principal Amount $ 2,500,000 $ 10,000,000
Market Value $ 2,500,000 $ 10,000,000
% of Partners' Capital 1.01% 1.53%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]    
Principal Amount $ 31,200,000 $ 10,000,000
Market Value $ 31,200,000 $ 10,000,000
% of Partners' Capital 12.58% 1.53%
[1] Collateral amounted to $100,299,442 on open futures contracts.
[2] Collateral amounted to $101,001,407 on open futures contracts.