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Condensed Schedule of Investments - Jun. 30, 2015
USD ($)
Number
Cash Equivalents [Member] | Morgan Stanley Institutional Liquidity Fund - Government Portfolio [Member] | Money Market Funds [Member]  
Principal Amount $ 6,510,691
Market Values $ 6,510,691
% of Partners' Capital 42.33%
Cash Equivalents [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 19.50%
Cash Equivalents [Member] | United State [Member]  
Market Values $ 9,510,691
% of Partners' Capital 61.83%
Open Futures Contracts, Long [Member] | United State [Member]  
Number of Contracts | Number [1] 504
Unrealized Gain (Loss) on Open Commodity Contracts [1] $ (1,161,481)
% of Partners' Capital [1] (7.55%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2015 contracts, expiring July 2015 [Member]  
Number of Contracts | Number 42
Unrealized Gain (Loss) on Open Commodity Contracts $ (190,570)
% of Partners' Capital (1.24%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2015 contracts, expiring August 2015 [Member]  
Number of Contracts | Number 42
Unrealized Gain (Loss) on Open Commodity Contracts $ (157,030)
% of Partners' Capital (1.02%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2015 contracts, expiring September 2015 [Member]  
Number of Contracts | Number 42
Unrealized Gain (Loss) on Open Commodity Contracts $ (147,010)
% of Partners' Capital (0.95%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG November 2015 contracts, expiring October 2015 [Member]  
Number of Contracts | Number 42
Unrealized Gain (Loss) on Open Commodity Contracts $ (156,700)
% of Partners' Capital (1.02%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG December 2015 contracts, expiring November 2015 [Member]  
Number of Contracts | Number 42
Unrealized Gain (Loss) on Open Commodity Contracts $ (142,740)
% of Partners' Capital (0.93%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG January 2016 contracts, expiring December 2015 [Member]  
Number of Contracts | Number 42
Unrealized Gain (Loss) on Open Commodity Contracts $ (271,115)
% of Partners' Capital (1.76%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2016 contracts, expiring January 2016 [Member]  
Number of Contracts | Number 42
Unrealized Gain (Loss) on Open Commodity Contracts $ (65,790)
% of Partners' Capital (0.43%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG March 2016 contracts, expiring February 2016 [Member]  
Number of Contracts | Number 42
Unrealized Gain (Loss) on Open Commodity Contracts $ (51,066)
% of Partners' Capital (0.33%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG April 2016 contracts, expiring March 2016 [Member]  
Number of Contracts | Number 42
Unrealized Gain (Loss) on Open Commodity Contracts $ (6,916)
% of Partners' Capital (0.04%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG May 2016 contracts, expiring April 2016 [Member]  
Number of Contracts | Number 42
Unrealized Gain (Loss) on Open Commodity Contracts $ 54,017
% of Partners' Capital 0.35%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2016 contracts, expiring May 2016 [Member]  
Number of Contracts | Number 42
Unrealized Gain (Loss) on Open Commodity Contracts $ (31,941)
% of Partners' Capital (0.21%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2016 contracts, expiring June 2016 [Member]  
Number of Contracts | Number 42
Unrealized Gain (Loss) on Open Commodity Contracts $ 5,380
% of Partners' Capital 0.03%
[1] Collateral amounted to $2,895,276 on open future contracts.