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Condensed Statements of Changes in Partners' Capital (USD $)
General Partner [Member]
Limited Partners [Member]
Total
Balances, at December 31, 2012 at Dec. 31, 2012 $ 0 $ 43,085,691 $ 43,085,691
Net asset value, beginning of period at Dec. 31, 2012     $ 17.23
Addition of 200,000 partnership units 0 3,480,456 3,480,456
Redemption of 450,000 partnership units 0 (8,260,181) (8,260,181)
Net income (loss) 0 5,076,144 5,076,144
Balances, at March 31, 2013 at Mar. 31, 2013 $ 0 $ 43,382,110 $ 43,382,110
Net asset value, end of period at Mar. 31, 2013     $ 19.28