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Schedule of Investments
Dec. 31, 2015
USD ($)
Contracts
Dec. 31, 2014
USD ($)
Contracts
United State [Member] | Money Market Funds [Member]    
Market Values $ 4,500,000 $ 9,510,692
% of Partners' Capital 34.28% 57.90%
United State [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member] | Money Market Funds [Member]    
Principal Amount $ 500,000 $ 1
Market Values $ 500,000 $ 1
% of Partners' Capital 3.81% 0.00% [1]
United State [Member] | Morgan Stanley Institutional Liquidity Fund - Government Portfolio [Member] | Money Market Funds [Member]    
Principal Amount $ 4,000,000 $ 6,510,691
Market Values $ 4,000,000 $ 6,510,691
% of Partners' Capital 30.47% 39.64%
United State [Member] | Wells Fargo Advantage Government Money Market Fund - Class I [Member] | Money Market Funds [Member]    
Principal Amount   $ 3,000,000
Market Values   $ 3,000,000
% of Partners' Capital   18.26%
Cash Equivalents [Member] | US Treasury Securities [Member]    
Market Values $ 3,995,184  
% of Partners' Capital 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 Values $ 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 Values $ 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 Values $ 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 Values $ 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 Values $ 997,662  
% of Partners' Capital 7.60%  
Cash Equivalents [Member] | U.S. Treasury Bill, 0.06%, 4/30/2015 [Member] | US Treasury Securities [Member]    
Principal Amount   $ 3,000,000
Market Values   $ 2,999,455
% of Partners' Capital   18.26%
Cash Equivalents [Member] | United State [Member]    
Market Values $ 8,495,184 $ 12,510,147
% of Partners' Capital 64.72% 76.16%
Open Futures Contracts, Long [Member] | United State [Member]    
Number of Contracts | Contracts 520 [2] 537 [3]
Unrealized Gain (Loss) on Open Commodity Contracts $ (2,421,976) [2] $ (4,919,890) [3]
% of Partners' Capital (18.45%) [2] (29.95%) [3]
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2015 contracts, expiring January 2015 [Member]    
Number of Contracts | Contracts   44
Unrealized Gain (Loss) on Open Commodity Contracts   $ (575,580)
% of Partners' Capital   (3.50%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG March 2015 contracts, expiring February 2015 [Member]    
Number of Contracts | Contracts   45
Unrealized Gain (Loss) on Open Commodity Contracts   $ (682,500)
% of Partners' Capital   (4.15%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG April 2015 contracts, expiring March 2015 [Member]    
Number of Contracts | Contracts   45
Unrealized Gain (Loss) on Open Commodity Contracts   $ (469,990)
% of Partners' Capital   (2.86%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG May 2015 contracts, expiring April 2015 [Member]    
Number of Contracts | Contracts   45
Unrealized Gain (Loss) on Open Commodity Contracts   $ (487,830)
% of Partners' Capital   (2.97%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2015 contracts, expiring May 2015 [Member]    
Number of Contracts | Contracts   45
Unrealized Gain (Loss) on Open Commodity Contracts   $ (431,920)
% of Partners' Capital   (2.63%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2015 contracts, expiring June 2015 [Member]    
Number of Contracts | Contracts   44
Unrealized Gain (Loss) on Open Commodity Contracts   $ (470,800)
% of Partners' Capital   (2.87%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2015 contracts, expiring July 2015 [Member]    
Number of Contracts | Contracts   45
Unrealized Gain (Loss) on Open Commodity Contracts   $ (383,790)
% of Partners' Capital   (2.34%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2015 contracts, expiring August 2015 [Member]    
Number of Contracts | Contracts   45
Unrealized Gain (Loss) on Open Commodity Contracts   $ (340,100)
% of Partners' Capital   (2.07%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2015 contracts, expiring September 2015 [Member]    
Number of Contracts | Contracts   45
Unrealized Gain (Loss) on Open Commodity Contracts   $ (336,770)
% of Partners' Capital   (2.05%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG November 2015 contracts, expiring October 2015 [Member]    
Number of Contracts | Contracts   45
Unrealized Gain (Loss) on Open Commodity Contracts   $ (284,380)
% of Partners' Capital   (1.73%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG December 2015 contracts, expiring November 2015 [Member]    
Number of Contracts | Contracts   44
Unrealized Gain (Loss) on Open Commodity Contracts   $ (277,720)
% of Partners' Capital   (1.69%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG January 2016 contracts, expiring December 2015 [Member]    
Number of Contracts | Contracts   45
Unrealized Gain (Loss) on Open Commodity Contracts   $ (178,510)
% of Partners' Capital   (1.09%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2016 contracts, expiring January 2016 [Member]    
Number of Contracts | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | Contracts 43  
Unrealized Gain (Loss) on Open Commodity Contracts $ 89,460  
% of Partners' Capital 0.68%  
[1] Represents less than 0.005%.
[2] Collateral amounted to $4,322,372 on open future contracts.
[3] Collateral amounted to $5,525,172 on open futures contracts