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Condensed Schedule of Investments (USD $)
Sep. 30, 2013
Cash Equivalents [Member]
  
Market Values $ 22,322,421
% of Partners' Capital 82.50%
Cash Equivalents [Member] | United State [Member] | Money Market Funds [Member]
  
Market Values 20,522,574
% of Partners' Capital 75.85%
Cash Equivalents [Member] | United State [Member] | U.S. Treasury Bill [Member] | US Treasury Securities [Member]
  
Principal Amount 1,800,000
Market Values 1,799,847
% of Partners' Capital 6.65%
Cash Equivalents [Member] | United State [Member] | Fidelity Institutional Government Portfolio - Class I [Member] | Money Market Funds [Member]
  
Principal Amount 2,509,115
Market Values 2,509,115
% of Partners' Capital 9.27%
Cash Equivalents [Member] | United State [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member] | Money Market Funds [Member]
  
Principal Amount 1,502,300
Market Values 1,502,300
% of Partners' Capital 5.55%
Cash Equivalents [Member] | United State [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 24.07%
Cash Equivalents [Member] | United State [Member] | Wells Fargo Advantage Government Money Market Fund - Class I [Member] | Money Market Funds [Member]
  
Principal Amount 10,000,468
Market Values 10,000,468
% of Partners' Capital 36.96%
Open Futures Contracts, Long [Member] | United State [Member]
  
Number of Contracts 713 [1]
Unrealized Gain on Open Commodity Contracts (1,505,810) [1]
% of Partners' Capital (5.57%) [1]
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG November 2013 contracts, expiring October2013 [Member]
  
Number of Contracts 59
Unrealized Gain on Open Commodity Contracts (261,140)
% of Partners' Capital (0.97%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG December 2013 contracts, expiring November 2013 [Member]
  
Number of Contracts 59
Unrealized Gain on Open Commodity Contracts (281,210)
% of Partners' Capital (1.04%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG January 2014 contracts, expiring December 2013 [Member]
  
Number of Contracts 60
Unrealized Gain on Open Commodity Contracts (113,440)
% of Partners' Capital (0.42%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2014 contracts, expiring January 2014 [Member]
  
Number of Contracts 59
Unrealized Gain on Open Commodity Contracts (141,350)
% of Partners' Capital (0.52%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG March 2014 contracts, expiring February 2014 [Member]
  
Number of Contracts 59
Unrealized Gain on Open Commodity Contracts (75,110)
% of Partners' Capital (0.28%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG April 2014 contracts, expiring March 2014 [Member]
  
Number of Contracts 60
Unrealized Gain on Open Commodity Contracts (138,130)
% of Partners' Capital (0.51%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG May 2014 contracts, expiring April 2014 [Member]
  
Number of Contracts 60
Unrealized Gain on Open Commodity Contracts (159,650)
% of Partners' Capital (0.59%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2014 contracts, expiring May 2014 [Member]
  
Number of Contracts 59
Unrealized Gain on Open Commodity Contracts (167,500)
% of Partners' Capital (0.62%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2014 contracts, expiring June 2014 [Member]
  
Number of Contracts 60
Unrealized Gain on Open Commodity Contracts (94,510)
% of Partners' Capital (0.35%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2014 contracts, expiring July 2014 [Member]
  
Number of Contracts 60
Unrealized Gain on Open Commodity Contracts (73,450)
% of Partners' Capital (0.27%)
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2014 contracts, expiring August 2014 [Member]
  
Number of Contracts 59
Unrealized Gain on Open Commodity Contracts 42,060
% of Partners' Capital 0.16%
Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2014 contracts, expiring September2014
  
Number of Contracts 59
Unrealized Gain on Open Commodity Contracts $ (42,380)
% of Partners' Capital (0.16%)
[1] Collateral amounted to $3,423,834 on open futures contracts.