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Condensed Statements of Changes in Partners' Capital (USD $)
Total
General Partner [Member]
Limited Partner [Member]
Balances, at at Dec. 31, 2012 $ 43,085,691 $ 0 $ 43,085,691
Net asset value, beginning of period at Dec. 31, 2012 $ 17.23    
Addition of 300,000 partnership units 5,143,147 0 5,143,147
Redemption of 1,350,000 partnership units (22,880,541) 0 (22,880,541)
Net income 1,706,055 0 1,706,055
Balances, at at Sep. 30, 2013 $ 27,054,352 $ 0 $ 27,054,352
Net asset value, end of period at Sep. 30, 2013 $ 16.91