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Condensed Statements of Operations (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Gain on trading of commodity futures contracts:    
Realized gain on closed positions $ 1,165,190 $ 2,158,700
Change in unrealized gain on open positions 2,312,560 7,301,720
Dividend income 5,612 6,102
Interest income 2,195 2,232
Other income 2,450 3,150
Total income 3,488,007 9,471,904
Expenses    
General Partner management fees (Note 3) 153,776 255,887
Professional fees 50,818 38,135
Registration fees 29,362 2,366
Brokerage commissions 3,982 4,890
Other expenses 9,157 14,438
Total expenses 247,095 315,716
Net income $ 3,240,912 $ 9,156,188
Net income per limited partnership unit 1.22 2.35
Net income per weighted average limited partnership unit 1.26 2.43
Weighted average limited partnership units outstanding 2,567,222 3,760,440