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Condensed Statements of Operations (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed contracts $ 1,133,470 $ (6,014,750) $ 2,298,660 $ (3,856,050)
Change in unrealized loss on open positions (3,424,160) (19,766,100) (1,111,600) (12,464,380)
Dividend income 4,817 8,308 10,429 14,410
Interest income 1,619 2,430 3,814 4,662
Other income 2,800 5,250 5,250 8,400
Total income (loss) (2,281,454) (25,764,862) 1,206,553 (16,292,958)
Expenses        
General Partner management fees (Note 3) 129,566 207,183 283,342 463,070
Professional fees 49,959 37,488 100,777 75,623
Registration fees 29,687 2,366 59,049 4,732
Brokerage commissions 2,289 6,454 6,271 11,344
Other expenses 8,916 11,806 18,073 26,244
Total expenses 220,417 265,297 467,512 581,013
Net income (loss) $ (2,501,871) $ (26,030,159) $ 739,041 $ (16,873,971)
Net income (loss) per limited partnership unit $ (0.96) $ (7.91) $ 0.26 $ (5.56)
Net income (loss) per weighted average limited partnership unit $ (1.15) $ (7.85) $ 0.31 $ (4.77)
Weighted average limited partnership units outstanding 2,182,418 3,316,484 2,373,757 3,538,462