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Condensed Statements of Changes in Partners' Capital (USD $)
Total
General Partner [Member]
Limited Partner [Member]
Balances 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 200,000 partnership units 3,480,456 0 3,480,456
Redemption of 1,200,000 partnership units (22,880,541) 0 (22,880,541)
Net income 2,122,933 0 2,122,933
Balances at Jun. 30, 2013 $ 25,808,539 $ 0 $ 25,808,539
Net asset value, end of period at Jun. 30, 2013 $ 17.21