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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 on trading of commodity futures contracts:        
Realized gain (loss) on closed positions $ (9,854,010) $ 2,052,560 $ (3,492,540) $ 5,967,540
Change in unrealized gain (loss) on open positions (806,290) (2,100,770) 347,910 (936,770)
Dividend income 3,150 1,003 4,413 2,095
Interest income 746 463 2,995 897
Other income 1,400 5,000 5,950 12,000
Total income (loss) (10,655,004) (41,744) (3,131,272) 5,045,762
Expenses        
General Partner management fees (Note 3) 91,372 87,790 196,887 133,251
Professional fees 29,057 49,868 58,113 102,556
Brokerage commissions 7,194 7,088 17,141 13,440
Other expenses 2,588 1,318 4,732 1,843
Total expenses 130,211 146,064 276,873 251,090
Expense waiver (Note 3) (10,782) (32,310) (18,848) (75,906)
Net expenses 119,429 113,754 258,025 175,184
Net income (loss) $ (10,774,433) $ (155,498) $ (3,389,297) $ 4,870,578
Net income (loss) per limited partnership unit (in dollars per unit) (16.93) (2.83) (5.17) 11.99
Net income (loss) per weighted average limited partnership unit (in dollars per unit) (16.95) (0.26) (5.15) 10.37
Weighted average limited partnership units outstanding (in units) 635,714 601,099 657,967 469,613