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Schedule of Investments
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
United State [Member] | Money Market Funds [Member]    
Market Value $ 5,000,000 $ 4,500,000
% of Partners' Capital 30.40% 34.28%
United State [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member] | Money Market Funds [Member]    
Principal Amount $ 2,000,000  
Market Value $ 2,000,000  
% of Partners' Capital 12.16%  
United State [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member] | Money Market Funds [Member]    
Principal Amount $ 1,000,000 $ 500,000
Market Value $ 1,000,000 $ 500,000
% of Partners' Capital 6.08% 3.81%
United State [Member] | Morgan Stanley Institutional Liquidity Fund - Government Portfolio [Member] | Money Market Funds [Member]    
Principal Amount $ 2,000,000 $ 4,000,000
Market Value $ 2,000,000 $ 4,000,000
% of Partners' Capital 12.16% 30.47%
Cash Equivalents [Member] | US Treasury Securities [Member]    
Market Value $ 6,292,035 $ 3,995,184
% of Partners' Capital 38.26% 30.44%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.19%, 2/04/2016 [Member]    
Principal Amount   $ 1,000,000
Market Value   $ 999,825
% of Partners' Capital   7.62%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.22%, 2/11/2016 [Member]    
Principal Amount   $ 1,000,000
Market Value   $ 999,755
% of Partners' Capital   7.62%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.43%, 6/02/2016 [Member]    
Principal Amount   $ 500,000
Market Value   $ 499,097
% of Partners' Capital   3.80%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.52%, 6/09/2016 [Member]    
Principal Amount   $ 500,000
Market Value   $ 498,845
% of Partners' Capital   3.80%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 6/30/2016 [Member]    
Principal Amount   $ 1,000,000
Market Value   $ 997,662
% of Partners' Capital   7.60%
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.34%, 1/05/2017 [Member]    
Principal Amount $ 400,000  
Market Value $ 399,985  
% of Partners' Capital 2.43%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.43%, 1/19/2017 [Member]    
Principal Amount $ 500,000  
Market Value $ 499,894  
% of Partners' Capital 3.04%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.36%, 1/26/2017 [Member]    
Principal Amount $ 500,000  
Market Value $ 499,875  
% of Partners' Capital 3.04%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.40%, 2/02/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,929  
% of Partners' Capital 1.22%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.42%, 2/09/2017 [Member]    
Principal Amount $ 300,000  
Market Value $ 299,864  
% of Partners' Capital 1.82%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 2/16/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,885  
% of Partners' Capital 1.22%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 2/23/2017 [Member]    
Principal Amount $ 300,000  
Market Value $ 299,803  
% of Partners' Capital 1.82%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 3/02/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,850  
% of Partners' Capital 1.22%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 3/09/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,825  
% of Partners' Capital 1.22%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.50%, 3/16/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,793  
% of Partners' Capital 1.22%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.45%, 3/23/2017 [Member]    
Principal Amount $ 300,000  
Market Value $ 299,700  
% of Partners' Capital 1.82%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.43%, 3/30/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,790  
% of Partners' Capital 1.22%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.46%, 4/06/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,760  
% of Partners' Capital 1.22%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 4/13/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,734  
% of Partners' Capital 1.22%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.46%, 4/20/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,725  
% of Partners' Capital 1.21%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.47%, 4/27/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,700  
% of Partners' Capital 1.21%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.49%, 5/04/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,663  
% of Partners' Capital 1.21%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.55%, 5/11/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,606  
% of Partners' Capital 1.21%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.60%, 5/18/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,547  
% of Partners' Capital 1.21%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.61%, 5/25/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,514  
% of Partners' Capital 1.21%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.60%, 6/01/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,501  
% of Partners' Capital 1.21%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.62%, 6/08/2017 [Member]    
Principal Amount $ 300,000  
Market Value $ 299,190  
% of Partners' Capital 1.82%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.65%, 6/15/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,409  
% of Partners' Capital 1.21%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.64%, 6/22/2017 [Member]    
Principal Amount $ 200,000  
Market Value $ 199,388  
% of Partners' Capital 1.21%  
Cash Equivalents [Member] | US Treasury Securities [Member] | U.S. Treasury Bills: 0.60%, 6/29/2017 [Member]    
Principal Amount $ 300,000  
Market Value $ 299,105  
% of Partners' Capital 1.82%  
Cash Equivalents [Member] | United State [Member]    
Market Value $ 11,292,035 $ 8,495,184
% of Partners' Capital 68.66% 64.72%
Open Futures Contracts, Long [Member] | United State [Member]    
Number of Contracts 454 [1] 520 [2]
Unrealized Gain (Loss) on Open Commodity Contracts $ 2,796,004 [1] $ (2,421,976) [2]
% of Partners' Capital 17.00% [1] (18.45%) [2]
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2016 contracts, expiring January 2016 [Member]    
Number of Contracts   44
Unrealized Gain (Loss) on Open Commodity Contracts   $ (401,350)
% of Partners' Capital   (3.06%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG March 2016 contracts, expiring February 2016 [Member]    
Number of Contracts   43
Unrealized Gain (Loss) on Open Commodity Contracts   $ (368,312)
% of Partners' Capital   (2.81%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG April 2016 contracts, expiring March 2016 [Member]    
Number of Contracts   43
Unrealized Gain (Loss) on Open Commodity Contracts   $ (259,738)
% of Partners' Capital   (1.98%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG May 2016 contracts, expiring April 2016 [Member]    
Number of Contracts   44
Unrealized Gain (Loss) on Open Commodity Contracts   $ (198,797)
% of Partners' Capital   (1.51%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2016 contracts, expiring May 2016 [Member]    
Number of Contracts   43
Unrealized Gain (Loss) on Open Commodity Contracts   $ (274,070)
% of Partners' Capital   (2.09%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2016 contracts, expiring June 2016 [Member]    
Number of Contracts   43
Unrealized Gain (Loss) on Open Commodity Contracts   $ (232,402)
% of Partners' Capital   (1.77%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2016 contracts, expiring July 2016 [Member]    
Number of Contracts   44
Unrealized Gain (Loss) on Open Commodity Contracts   $ (250,586)
% of Partners' Capital   (1.91%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2016 contracts, expiring August 2016 [Member]    
Number of Contracts   43
Unrealized Gain (Loss) on Open Commodity Contracts   $ (192,206)
% of Partners' Capital   (1.46%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2016 contracts, expiring September 2016 [Member]    
Number of Contracts   43
Unrealized Gain (Loss) on Open Commodity Contracts   $ (167,008)
% of Partners' Capital   (1.27%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG November 2016 contracts, expiring October 2016 [Member]    
Number of Contracts   44
Unrealized Gain (Loss) on Open Commodity Contracts   $ (120,034)
% of Partners' Capital   (0.91%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG December 2016 contracts, expiring November 2016 [Member]    
Number of Contracts   43
Unrealized Gain (Loss) on Open Commodity Contracts   $ (46,933)
% of Partners' Capital   (0.36%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG January 2017 contracts, expiring December 2016 [Member]    
Number of Contracts   43
Unrealized Gain (Loss) on Open Commodity Contracts   $ 89,460
% of Partners' Capital   0.68%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2017 contracts, expiring January 2017 [Member]    
Number of Contracts 38  
Unrealized Gain (Loss) on Open Commodity Contracts $ 324,287  
% of Partners' Capital 1.97%  
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG March 2017 contracts, expiring February 2017 [Member]    
Number of Contracts 38  
Unrealized Gain (Loss) on Open Commodity Contracts $ 372,656  
% of Partners' Capital 2.27%  
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG April 2017 contracts, expiring March 2017 [Member]    
Number of Contracts 37  
Unrealized Gain (Loss) on Open Commodity Contracts $ 359,570  
% of Partners' Capital 2.19%  
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG May 2017 contracts, expiring April 2017 [Member]    
Number of Contracts 38  
Unrealized Gain (Loss) on Open Commodity Contracts $ 319,852  
% of Partners' Capital 1.94%  
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2017 contracts, expiring May 2017 [Member]    
Number of Contracts 38  
Unrealized Gain (Loss) on Open Commodity Contracts $ 269,745  
% of Partners' Capital 1.64%  
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2017 contracts, expiring June 2017 [Member]    
Number of Contracts 38  
Unrealized Gain (Loss) on Open Commodity Contracts $ 224,608  
% of Partners' Capital 1.37%  
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2017 contracts, expiring July 2017 [Member]    
Number of Contracts 38  
Unrealized Gain (Loss) on Open Commodity Contracts $ 180,349  
% of Partners' Capital 1.10%  
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2017 contracts, expiring August 2017 [Member]    
Number of Contracts 38  
Unrealized Gain (Loss) on Open Commodity Contracts $ 224,249  
% of Partners' Capital 1.36%  
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2017 contracts, expiring September 2017 [Member]    
Number of Contracts 37  
Unrealized Gain (Loss) on Open Commodity Contracts $ 186,052  
% of Partners' Capital 1.13%  
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG November 2017 contracts, expiring October 2017 [Member]    
Number of Contracts 38  
Unrealized Gain (Loss) on Open Commodity Contracts $ 98,323  
% of Partners' Capital 0.60%  
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG December 2017 contracts, expiring November 2017 [Member]    
Number of Contracts 38  
Unrealized Gain (Loss) on Open Commodity Contracts $ 188,413  
% of Partners' Capital 1.14%  
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG January 2018 contracts, expiring December 2017 [Member]    
Number of Contracts 38  
Unrealized Gain (Loss) on Open Commodity Contracts $ 47,900  
% of Partners' Capital 0.29%  
[1] Collateral amounted to $699,804 on open futures contracts.
[2] Collateral amounted to $4,322,372 on open futures contracts.