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Schedule of Investments - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (20,768,690) $ (67,021,257)
Open Futures Contracts - Long [Member] | United States Contracts    
Notional Amount $ 465,354,590 [1] $ 315,010,257 [2]
Number of Contracts 20,310 [1] 12,935 [2]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ (20,768,690) [1] $ (67,021,257) [2]
% of Partners' Capital (4.67%) [1] (27.02%) [2]
Open Futures Contracts - Long [Member] | United States Contracts | 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 Contracts | 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%)
Cash Equivalents [Member]    
Market Value $ 418,959,876 $ 272,193,228
% of Partners' Capital 94.24% 109.75%
Cash Equivalents [Member] | United States Treasury Obligations [Member]    
Market Value $ 258,959,876 $ 238,493,228
% of Partners' Capital 58.25% 96.16%
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, 2.05%, 1/02/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,999,438  
% of Partners' Capital 2.25%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.03%, 1/09/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,995,533  
% of Partners' Capital 2.25%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.01%, 1/16/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,991,729  
% of Partners' Capital 2.25%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.04%, 1/23/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,987,674  
% of Partners' Capital 2.25%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 2.02%, 1/30/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,983,905  
% of Partners' Capital 2.25%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.90%, 2/06/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,981,225  
% of Partners' Capital 2.25%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.87%, 2/13/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,977,843  
% of Partners' Capital 2.24%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.85%, 2/20/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,974,514  
% of Partners' Capital 2.24%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.85%, 2/27/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,971,025  
% of Partners' Capital 2.24%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.83%, 3/05/2020 [Member]    
Principal Amount $ 20,000,000  
Market Value $ 19,935,413  
% of Partners' Capital 4.48%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.84%, 3/19/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,960,567  
% of Partners' Capital 2.24%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.88%, 3/26/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,956,083  
% of Partners' Capital 2.24%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.70%, 4/02/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,956,811  
% of Partners' Capital 2.24%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.64%, 4/09/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,955,175  
% of Partners' Capital 2.24%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.60%, 4/16/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,953,183  
% of Partners' Capital 2.24%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.60%, 4/23/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,950,092  
% of Partners' Capital 2.24%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.59%, 4/30/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,947,500  
% of Partners' Capital 2.24%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.54%, 5/07/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,946,201  
% of Partners' Capital 2.24%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.55%, 5/14/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,942,678  
% of Partners' Capital 2.24%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.55%, 5/21/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,939,879  
% of Partners' Capital 2.24%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.58%, 5/28/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,935,456  
% of Partners' Capital 2.23%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.53%, 6/04/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,934,556  
% of Partners' Capital 2.23%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.53%, 6/11/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,931,488  
% of Partners' Capital 2.23%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.54%, 6/18/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,928,175  
% of Partners' Capital 2.23%  
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills, 1.57%, 6/25/2020 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,923,733  
% of Partners' Capital 2.23%  
Cash Equivalents [Member] | United States Contracts | Money Market Funds [Member]    
Market Value $ 160,000,000 $ 33,700,000
% of Partners' Capital 35.99% 13.59%
Cash Equivalents [Member] | United States Contracts | Money Market Funds [Member] | Fidelity Investments Money Market Funds Government Portfolio [Member]    
Principal Amount $ 115,000,000 $ 2,500,000
Market Value $ 115,000,000 $ 2,500,000
% of Partners' Capital 25.87% 1.01%
Cash Equivalents [Member] | United States Contracts | Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]    
Principal Amount $ 25,000,000 $ 31,200,000
Market Value $ 25,000,000 $ 31,200,000
% of Partners' Capital 5.62% 12.58%
Cash Equivalents [Member] | United States Contracts | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]    
Principal Amount $ 20,000,000  
Market Value $ 20,000,000  
% of Partners' Capital 4.50%  
[1] Collateral amounted to $83,410,316 on open futures contracts.
[2] Collateral amounted to $100,299,442 on open futures contracts.