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Condensed Schedule of Investments
Jun. 30, 2017
USD ($)
United State [Member] | Open Futures Contracts, Long [Member]  
Number of Contracts 310 [1]
Unrealized Gain (Loss) on Open Commodity Contracts $ (313,469) [1]
% of Partners' Capital (3.29%) [1]
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG August 2017 contracts, expiring July 2017 [Member]  
Number of Contracts 26
Unrealized Gain (Loss) on Open Commodity Contracts $ (21,719)
% of Partners' Capital (0.23%)
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG September 2017 contracts, expiring August 2017 [Member]  
Number of Contracts 26
Unrealized Gain (Loss) on Open Commodity Contracts $ 17,974
% of Partners' Capital 0.19%
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG October 2017 contracts, expiring September 2017 [Member]  
Number of Contracts 25
Unrealized Gain (Loss) on Open Commodity Contracts $ (3,458)
% of Partners' Capital (0.04%)
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG November 2017 contracts, expiring October 2017 [Member]  
Number of Contracts 26
Unrealized Gain (Loss) on Open Commodity Contracts $ (59,087)
% of Partners' Capital (0.62%)
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG December 2017 contracts, expiring November 2017 [Member]  
Number of Contracts 26
Unrealized Gain (Loss) on Open Commodity Contracts $ 12,106
% of Partners' Capital 0.13%
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG January 2018 contracts, expiring December 2017 [Member]  
Number of Contracts 26
Unrealized Gain (Loss) on Open Commodity Contracts $ (77,466)
% of Partners' Capital (0.81%)
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG February 2018 contracts, expiring January 2018 [Member]  
Number of Contracts 26
Unrealized Gain (Loss) on Open Commodity Contracts $ (85,465)
% of Partners' Capital (0.90%)
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG March 2018 contracts, expiring February 2018 [Member]  
Number of Contracts 25
Unrealized Gain (Loss) on Open Commodity Contracts $ (58,035)
% of Partners' Capital (0.61%)
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG April 2018 contracts, expiring March 2018 [Member]  
Number of Contracts 26
Unrealized Gain (Loss) on Open Commodity Contracts $ (1,066)
% of Partners' Capital (0.01%)
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG May 2018 contracts, expiring April 2018 [Member]  
Number of Contracts 26
Unrealized Gain (Loss) on Open Commodity Contracts $ (9,967)
% of Partners' Capital (0.10%)
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG June 2018 contracts, expiring May 2018 [Member]  
Number of Contracts 26
Unrealized Gain (Loss) on Open Commodity Contracts $ (22,976)
% of Partners' Capital (0.24%)
United State [Member] | Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG July 2018 contracts, expiring June 2018 [Member]  
Number of Contracts 26
Unrealized Gain (Loss) on Open Commodity Contracts $ (4,310)
% of Partners' Capital (0.05%)
United State [Member] | Money Market Funds [Member]  
Market Value $ 3,600,000
% of Partners' Capital 37.81%
United State [Member] | Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]  
Principal Amount $ 1,600,000
Market Value $ 1,600,000
% of Partners' Capital 16.81%
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 10.50%
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 10.50%
Cash Equivalents [Member] | US Treasury Securities [Member]  
Market Value $ 5,487,304
% of Partners' Capital 57.62%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.62%, 7/06/2017  
Principal Amount $ 200,000
Market Value $ 199,983
% of Partners' Capital 2.10%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.59%, 7/13/2017  
Principal Amount $ 300,000
Market Value $ 299,941
% of Partners' Capital 3.15%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.61%, 7/20/2017  
Principal Amount $ 300,000
Market Value $ 299,904
% of Partners' Capital 3.15%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.60%, 7/27/2017  
Principal Amount $ 300,000
Market Value $ 299,871
% of Partners' Capital 3.15%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.63%, 8/03/2017  
Principal Amount $ 200,000
Market Value $ 199,885
% of Partners' Capital 2.10%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.61%, 8/10/2017  
Principal Amount $ 300,000
Market Value $ 299,797
% of Partners' Capital 3.15%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.65%, 8/17/2017  
Principal Amount $ 200,000
Market Value $ 199,830
% of Partners' Capital 2.10%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.67%, 8/24/2017  
Principal Amount $ 200,000
Market Value $ 199,799
% of Partners' Capital 2.10%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.76%, 8/31/2017  
Principal Amount $ 100,000
Market Value $ 99,872
% of Partners' Capital 1.05%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.84%, 9/07/2017  
Principal Amount $ 200,000
Market Value $ 199,683
% of Partners' Capital 2.10%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.86%, 9/14/2017  
Principal Amount $ 200,000
Market Value $ 199,642
% of Partners' Capital 2.10%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.87%, 9/21/2017  
Principal Amount $ 200,000
Market Value $ 199,604
% of Partners' Capital 2.10%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.89%, 9/28/2017  
Principal Amount $ 200,000
Market Value $ 199,560
% of Partners' Capital 2.10%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.90%, 10/05/2017  
Principal Amount $ 200,000
Market Value $ 199,523
% of Partners' Capital 2.09%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.92%, 10/12/2017  
Principal Amount $ 200,000
Market Value $ 199,476
% of Partners' Capital 2.09%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.91%, 10/19/2017  
Principal Amount $ 200,000
Market Value $ 199,447
% of Partners' Capital 2.09%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.95%, 10/26/2017  
Principal Amount $ 200,000
Market Value $ 199,382
% of Partners' Capital 2.09%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.97%, 11/02/2017  
Principal Amount $ 200,000
Market Value $ 199,335
% of Partners' Capital 2.09%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 1.01%, 11/09/2017  
Principal Amount $ 300,000
Market Value $ 298,903
% of Partners' Capital 3.14%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.98%, 11/16/2017  
Principal Amount $ 200,000
Market Value $ 199,249
% of Partners' Capital 2.09%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 1.05%, 11/24/2017  
Principal Amount $ 200,000
Market Value $ 199,152
% of Partners' Capital 2.09%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 1.05%, 11/30/2017  
Principal Amount $ 100,000
Market Value $ 99,559
% of Partners' Capital 1.04%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 1.08%, 12/07/2017  
Principal Amount $ 200,000
Market Value $ 199,055
% of Partners' Capital 2.09%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 1.09%, 12/14/2017  
Principal Amount $ 200,000
Market Value $ 199,004
% of Partners' Capital 2.09%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 1.11%, 12/21/2017  
Principal Amount $ 200,000
Market Value $ 198,943
% of Partners' Capital 2.09%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 1.10%, 12/28/2017  
Principal Amount $ 200,000
Market Value $ 198,905
% of Partners' Capital 2.09%
Cash Equivalents [Member] | United State [Member]  
Market Value $ 9,087,304
% of Partners' Capital 95.43%
[1] Collateral amounted to $1,192,186 on open futures contracts.