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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 loss on closed positions $ (5,047,770) $ (1,127,760) $ (10,812,920) $ (3,068,370)
Change in unrealized gain (loss) on open positions 7,351,410 (799,220) 6,397,620 716,570
Dividend income 946 880 1,581 3,081
Interest income 1,521 123 2,398 227
Other income 3,150 1,000 7,000 5,000
Total income (loss) 2,309,257 (1,924,977) (4,404,321) (2,343,492)
Expenses        
General Partner management fees (Note 3) 62,288 69,828 105,990 128,076
Professional fees 25,071 49,868 50,143 99,188
Brokerage commissions 4,592 1,712 7,999 4,378
Other expenses 2,647 3,352 4,484 6,074
Total expenses 94,598 124,760 168,616 237,716
Expense waiver (Note 3) (12,614) (35,903) (28,921) (73,573)
Net expenses 81,984 88,857 139,695 164,143
Net income (loss) $ 2,227,273 $ (2,013,834) $ (4,544,016) $ (2,507,635)
Net income (loss) per limited partnership unit 1.01 (1.70) (3.83) (2.45)
Net income (loss) per weighted average limited partnership unit 1.10 (1.81) (2.77) (2.44)
Weighted average limited partnership units outstanding 2,024,725 1,115,385 1,643,132 1,025,967