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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 on closed positions $ 1,440,840 $ 6,361,470
Change in unrealized gain (loss) on open positions (662,270) 1,154,200
Dividend income 2,259 1,263
Interest income 995 2,249
Other income 4,900 4,550
Total income 786,724 7,523,732
Expenses    
General Partner management fees (Note 3) 80,291 105,515
Professional fees 30,882 29,056
Brokerage commissions 8,402 9,947
Other expenses 2,284 2,144
Total expenses 121,859 146,662
Expense waiver (Note 3) (14,868) (8,066)
Net expenses 106,991 138,596
Net income $ 679,733 $ 7,385,136
Net income per limited partnership unit 1.31 11.76
Net income per weighted average limited partnership unit 1.32 10.86
Weighted average limited partnership units outstanding 516,111 680,220