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Condensed Schedule of Investments (USD $)
Sep. 30, 2014
Money Market Funds [Member]
  
Market Values $ 9,510,692
% of Partners' Capital 58.57%
Cash Equivalents [Member]
  
Market Values 12,510,595
% of Partners' Capital 77.04%
Cash Equivalents [Member] | US Treasury Securities [Member]
  
Principal Amount 3,000,000
Market Values 2,999,903
% of Partners' Capital 18.47%
Cash Equivalents [Member] | Fidelity Institutional Government Portfolio - Class I [Member] | Money Market Funds [Member]
  
Principal Amount 1
Market Values 1
% of Partners' Capital 0.00% [1]
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 40.09%
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 18.48%
Open Futures Contracts, Long [Member]
  
Number of Contracts 405 [2]
Unrealized Gain (Loss) on Open Commodity Contracts (522,060) [2]
% of Partners' Capital (3.21%) [2]
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG November 2014 contracts, expiring October 2014 [Member]
  
Number of Contracts 34
Unrealized Gain (Loss) on Open Commodity Contracts (990)
% of Partners' Capital (0.01%)
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG December 2014 contracts, expiring November 2014 [Member]
  
Number of Contracts 34
Unrealized Gain (Loss) on Open Commodity Contracts 78,600
% of Partners' Capital 0.48%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG January 2015 contracts, expiring December 2014 [Member]
  
Number of Contracts 34
Unrealized Gain (Loss) on Open Commodity Contracts (64,070)
% of Partners' Capital (0.39%)
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG February 2015 contracts, expiring January 2015 [Member]
  
Number of Contracts 33
Unrealized Gain (Loss) on Open Commodity Contracts (29,670)
% of Partners' Capital (0.18%)
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG March 2015 contracts, expiring February 2015 [Member]
  
Number of Contracts 34
Unrealized Gain (Loss) on Open Commodity Contracts (170,810)
% of Partners' Capital (1.05%)
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG April 2015 contracts, expiring March 2015 (Member)
  
Number of Contracts 34
Unrealized Gain (Loss) on Open Commodity Contracts (66,190)
% of Partners' Capital (0.41%)
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG May 2015 contracts, expiring April 2015 [Member]
  
Number of Contracts 34
Unrealized Gain (Loss) on Open Commodity Contracts (106,300)
% of Partners' Capital (0.65%)
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG June 2015 contracts, expiring May 2015 [Member]
  
Number of Contracts 34
Unrealized Gain (Loss) on Open Commodity Contracts (61,070)
% of Partners' Capital (0.38%)
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG July 2015 contracts, expiring June 2015 [Member]
  
Number of Contracts 34
Unrealized Gain (Loss) on Open Commodity Contracts (115,830)
% of Partners' Capital (0.71%)
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG August 2015 contracts, expiring July 2015 [Member]
  
Number of Contracts 33
Unrealized Gain (Loss) on Open Commodity Contracts (24,090)
% of Partners' Capital (0.15%)
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG September 2015 contracts, expiring August 2015 [Member]
  
Number of Contracts 33
Unrealized Gain (Loss) on Open Commodity Contracts 15,490
% of Partners' Capital 0.10%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG October 2015 contracts, expiring September 2015 [Member]
  
Number of Contracts 34
Unrealized Gain (Loss) on Open Commodity Contracts $ 22,870
% of Partners' Capital 0.14%
[1] Represents less than 0.005%.
[2] Collateral amounted to $2,242,005 on open future contracts.