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Condensed Statements of Operations (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Gain (loss) on trading of commodity contracts:        
Realized gain (loss) on closed futures contracts $ (6,014,750) $ 13,159,190 $ (3,856,050) $ 21,292,660
Change in unrealized loss on open positions (19,766,100) (37,193,770) (12,464,380) (14,501,200)
Dividend income 8,308 5,705 14,410 18,034
Interest income 2,430 585 4,662 1,581
Other income 5,250 8,000 8,400 24,000
Total income (loss) (25,764,862) (24,020,290) (16,292,958) 6,835,075
Expenses        
General Partner management fees (Note 3) 207,183 367,540 463,070 693,859
Professional fees 37,488 99,690 75,623 200,774
Brokerage commissions 6,454 5,219 11,344 17,242
Other expenses 14,172 26,101 30,976 49,160
Total expenses 265,297 498,550 581,013 961,035
Net income (loss) $ (26,030,159) $ (24,518,840) $ (16,873,971) $ 5,874,040
Net income (loss) per limited partnership unit (7.91) (4.71) (5.56) 0.88
Net income (loss) per weighted average limited partnership unit (7.85) (4.68) (4.77) 1.16
Weighted average limited partnership units outstanding 3,316,484 5,241,758 3,538,462 5,080,663