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Statements of Operations (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Gain (loss) on trading of commodity futures contracts:      
Realized loss on closed positions $ (12,161,650) $ (7,653,100) $ (9,574,510)
Change in unrealized gain (loss) on open positions 7,676,740 (6,408,260) (3,837,730)
Dividend income 4,189 4,110 13,917
Interest income 7,257 2,028 1,610
Other income 10,500 5,350 8,000
Total loss (4,462,964) (14,049,872) (13,388,713)
Expenses      
General Partner management fees (Note 3) 283,719 239,340 249,022
Professional fees 125,273 151,075 205,005
Brokerage commissions 14,360 7,002 12,869
Other expenses 11,379 11,374 16,070
Total expenses 434,731 408,791 482,966
Expense waiver (Note 3) (68,503) (113,169) (151,688)
Net expenses 366,228 295,622 331,278
Net loss $ (4,829,192) $ (14,345,494) $ (13,719,991)
Net loss per limited partnership unit (3.98) (13.81) (18.75)
Net loss per weighted average limited partnership unit (2.26) (13.80) (15.42)
Weighted average limited partnership units outstanding 2,132,514 1,039,452 889,863