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Condensed Statements of Operations (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Gain (loss) on trading of commodity futures contracts:    
Realized gain (loss) on closed positions $ 245,850 $ (5,765,150)
Change in unrealized gain (loss) on open positions 4,930,270 (953,790)
Dividend income 1,176 635
Interest income 2,005 877
Other income 3,500 3,850
Total income (loss) 5,182,801 (6,713,578)
Expenses    
General Partner management fees (Note 3) 83,273 43,702
Professional fees 31,072 25,072
Brokerage commissions 3,288 3,407
Other expenses 3,488 1,837
Total expenses 121,121 74,018
Expense waiver (Note 3) (14,464) (16,307)
Net expenses 106,657 57,711
Net income (loss) $ 5,076,144 $ (6,771,289)
Net income (loss) per limited partnership unit 2.05 (4.84)
Net income (loss) per weighted average limited partnership unit 1.98 (5.37)
Weighted average limited partnership units outstanding 2,560,556 1,261,538