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Condensed Schedule of Investments
Mar. 31, 2017
USD ($)
United State [Member] | Open Futures Contracts, Long [Member]  
Number of Contracts 352
Unrealized Gain (Loss) on Open Commodity Contracts $ 610,433
% of Partners' Capital 5.21%
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG May 2017 contracts, expiring April 2017 [Member]  
Number of Contracts 30
Unrealized Gain (Loss) on Open Commodity Contracts $ 148,582
% of Partners' Capital 1.27%
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG June 2017 contracts, expiring May 2017 [Member]  
Number of Contracts 29
Unrealized Gain (Loss) on Open Commodity Contracts $ 119,259
% of Partners' Capital 1.02%
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG July 2017 contracts, expiring June 2017 [Member]  
Number of Contracts 29
Unrealized Gain (Loss) on Open Commodity Contracts $ 93,112
% of Partners' Capital 0.79%
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG August 2017 contracts, expiring July 2017 [Member]  
Number of Contracts 29
Unrealized Gain (Loss) on Open Commodity Contracts $ 66,864
% of Partners' Capital 0.57%
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG September 2017 contracts, expiring August 2017 [Member]  
Number of Contracts 30
Unrealized Gain (Loss) on Open Commodity Contracts $ 106,838
% of Partners' Capital 0.91%
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG October 2017 contracts, expiring September 2017 [Member]  
Number of Contracts 29
Unrealized Gain (Loss) on Open Commodity Contracts $ 74,476
% of Partners' Capital 0.64%
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG November 2017 contracts, expiring October 2017 [Member]  
Number of Contracts 30
Unrealized Gain (Loss) on Open Commodity Contracts $ 8,023
% of Partners' Capital 0.07%
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG December 2017 contracts, expiring November 2017 [Member]  
Number of Contracts 29
Unrealized Gain (Loss) on Open Commodity Contracts $ 81,439
% of Partners' Capital 0.69%
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG January 2018 contracts, expiring December 2017 [Member]  
Number of Contracts 30
Unrealized Gain (Loss) on Open Commodity Contracts $ (29,084)
% of Partners' Capital (0.25%)
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG February 2018 contracts, expiring January 2018 [Member]  
Number of Contracts 29
Unrealized Gain (Loss) on Open Commodity Contracts $ (43,706)
% of Partners' Capital (0.37%)
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG March 2018 contracts, expiring February 2018 [Member]  
Number of Contracts 29
Unrealized Gain (Loss) on Open Commodity Contracts $ (21,430)
% of Partners' Capital (0.18%)
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG April 2018 contracts, expiring March 2018 [Member]  
Number of Contracts 29
Unrealized Gain (Loss) on Open Commodity Contracts $ 6,060
% of Partners' Capital 0.05%
United State [Member] | Money Market Funds [Member]  
Market Value $ 4,000,000
% of Partners' Capital 34.16%
United State [Member] | Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]  
Principal Amount $ 2,000,000
Market Value $ 2,000,000
% of Partners' Capital 17.08%
United State [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]  
Principal Amount $ 1,000,000
Market Value $ 1,000,000
% of Partners' Capital 8.54%
United State [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Fund - Government Portfolio [Member]  
Principal Amount $ 1,000,000
Market Value $ 1,000,000
% of Partners' Capital 8.54%
Cash Equivalents [Member] | US Treasury Securities [Member]  
Market Value $ 5,690,057
% of Partners' Capital 48.59%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.46%, 4/06/2017  
Principal Amount $ 200,000
Market Value $ 199,987
% of Partners' Capital 1.71%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 4/13/2017  
Principal Amount $ 200,000
Market Value $ 199,969
% of Partners' Capital 1.71%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.46%, 4/20/2017  
Principal Amount $ 200,000
Market Value $ 199,952
% of Partners' Capital 1.71%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 4/27/2017  
Principal Amount $ 200,000
Market Value $ 199,933
% of Partners' Capital 1.71%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.49%, 5/04/2017  
Principal Amount $ 200,000
Market Value $ 199,910
% of Partners' Capital 1.71%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.55%, 5/11/2017  
Principal Amount $ 200,000
Market Value $ 199,879
% of Partners' Capital 1.71%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.60%, 5/18/2017  
Principal Amount $ 200,000
Market Value $ 199,845
% of Partners' Capital 1.71%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.61%, 5/25/2017  
Principal Amount $ 200,000
Market Value $ 199,818
% of Partners' Capital 1.71%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.60%, 6/01/2017  
Principal Amount $ 200,000
Market Value $ 199,798
% of Partners' Capital 1.71%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.62%, 6/08/2017  
Principal Amount $ 300,000
Market Value $ 299,652
% of Partners' Capital 2.56%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.65%, 6/15/2017  
Principal Amount $ 200,000
Market Value $ 199,731
% of Partners' Capital 1.70%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.64%, 6/22/2017  
Principal Amount $ 200,000
Market Value $ 199,708
% of Partners' Capital 1.70%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.60%, 6/29/2017  
Principal Amount $ 300,000
Market Value $ 299,555
% of Partners' Capital 2.56%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.62%, 7/06/2017  
Principal Amount $ 200,000
Market Value $ 199,672
% of Partners' Capital 1.70%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.59%, 7/13/2017  
Principal Amount $ 300,000
Market Value $ 299,498
% of Partners' Capital 2.56%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.61%, 7/20/2017  
Principal Amount $ 300,000
Market Value $ 299,445
% of Partners' Capital 2.56%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.60%, 7/27/2017  
Principal Amount $ 300,000
Market Value $ 299,420
% of Partners' Capital 2.56%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.63%, 8/03/2017  
Principal Amount $ 200,000
Market Value $ 199,569
% of Partners' Capital 1.70%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.61%, 8/10/2017  
Principal Amount $ 300,000
Market Value $ 299,334
% of Partners' Capital 2.55%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.65%, 8/17/2017  
Principal Amount $ 200,000
Market Value $ 199,502
% of Partners' Capital 1.70%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.67%, 8/24/2017  
Principal Amount $ 200,000
Market Value $ 199,460
% of Partners' Capital 1.70%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.76%, 8/31/2017  
Principal Amount $ 100,000
Market Value $ 99,681
% of Partners' Capital 0.85%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.84%, 9/07/2017  
Principal Amount $ 200,000
Market Value $ 199,258
% of Partners' Capital 1.70%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.86%, 9/14/2017  
Principal Amount $ 200,000
Market Value $ 199,207
% of Partners' Capital 1.70%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.87%, 9/21/2017  
Principal Amount $ 200,000
Market Value $ 199,164
% of Partners' Capital 1.70%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.89%, 9/28/2017  
Principal Amount $ 200,000
Market Value $ 199,110
% of Partners' Capital 1.70%
Cash Equivalents [Member] | United State [Member]  
Market Value $ 9,690,057
% of Partners' Capital 82.75%