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Condensed Schedule of Investments (USD $)
Jun. 30, 2014
Money Market Funds [Member]
  
Market Values $ 9,510,691
% of Partners' Capital 54.01%
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 36.97%
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 17.04%
Cash Equivalents [Member]
  
Market Values 12,510,288
% of Partners' Capital 71.05%
Cash Equivalents [Member] | US Treasury Securities [Member]
  
Principal Amount 3,000,000
Market Values 2,999,597
% of Partners' Capital 17.04%
Open Futures Contracts, Long [Member]
  
Number of Contracts 405 [1]
Unrealized Gain on Open Commodity Contracts 829,580 [1]
% of Partners' Capital 4.71% [1]
Open Futures Contracts, Long [Member] | NNYMEX Natural Gas Futures NG August 2014 contracts, expiring July 2014 [Member]
  
Number of Contracts 33
Unrealized Gain on Open Commodity Contracts 166,160
% of Partners' Capital 0.94%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG September 2014 contracts, expiring August 2014 [Member]
  
Number of Contracts 34
Unrealized Gain on Open Commodity Contracts 208,760
% of Partners' Capital 1.19%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG October 2014 contracts, expiring September 2014 [Member]
  
Number of Contracts 34
Unrealized Gain on Open Commodity Contracts 164,990
% of Partners' Capital 0.94%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG November 2014 contracts, expiring October 2014 [Member]
  
Number of Contracts 34
Unrealized Gain on Open Commodity Contracts 115,630
% of Partners' Capital 0.66%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG December 2014 contracts, expiring November 2014 [Member]
  
Number of Contracts 34
Unrealized Gain on Open Commodity Contracts 194,880
% of Partners' Capital 1.11%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG January 2015 contracts, expiring December 2014 [Member]
  
Number of Contracts 33
Unrealized Gain on Open Commodity Contracts 46,730
% of Partners' Capital 0.26%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG February 2015 contracts, expiring January 2015 [Member]
  
Number of Contracts 33
Unrealized Gain on Open Commodity Contracts 76,590
% of Partners' Capital 0.43%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG March 2015 contracts, expiring February 2015 [Member]
  
Number of Contracts 34
Unrealized Gain on Open Commodity Contracts (65,750)
% of Partners' Capital (0.37%)
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG April 2015 contracts, expiring March 2015 (Member)
  
Number of Contracts 34
Unrealized Gain on Open Commodity Contracts 1,130
% of Partners' Capital 0.01%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG May 2015 contracts, expiring April 2015 [Member]
  
Number of Contracts 34
Unrealized Gain on Open Commodity Contracts (38,980)
% of Partners' Capital (0.22%)
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG June 2015 contracts, expiring May 2015 [Member]
  
Number of Contracts 34
Unrealized Gain on Open Commodity Contracts 6,250
% of Partners' Capital 0.03%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG July 2015 contracts, expiring June 2015 [Member]
  
Number of Contracts 34
Unrealized Gain on Open Commodity Contracts $ (46,810)
% of Partners' Capital (0.27%)
[1] Collateral amounted to $238,536 on open futures contracts.