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Condensed Statements of Operations (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Gain (loss) on trading of commodity futures contracts:        
Realized loss on closed positions $ (1,127,760) $ (2,761,400) $ (3,068,370) $ (2,772,650)
Change in unrealized gain (loss) on open positions (799,220) 4,573,760 716,570 (4,783,520)
Dividend income 880 3,342 3,081 4,872
Interest income 123 423 227 775
Other income 1,000 3,000 5,000 4,000
Total income (loss) (1,924,977) 1,819,125 (2,343,492) (7,546,523)
Expenses        
General Partners' management fees (Note 3) 69,828 62,548 128,076 114,795
Professional fees 49,868 36,900 99,188 188,500
Brokerage commissions 1,712 4,193 4,378 6,213
Other expenses 3,352 7,290 6,074 9,867
Total expenses 124,760 110,931 237,716 319,375
Expense waiver (Note 3) (35,903) (30,482) (73,573) (169,020)
Net expenses 88,857 80,449 164,143 150,355
Net income (loss) $ (2,013,834) $ 1,738,676 $ (2,507,635) $ (7,696,878)
Net income (loss) per limited partnership unit (1.70) 1.82 (2.45) (11.41)
Net income (loss) per weighted average limited partnership unit (1.81) 2.05 (2.44) (9.87)
Weighted average limited partnership units outstanding 1,115,385 846,154 1,025,967 780,110