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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 gain (loss) on closed positions $ (6,954,520) $ 16,224,040 $ 17,158,730
Change in unrealized loss on open positions (2,445,210) (11,864,440) (4,935,530)
Dividend income 28,563 26,400 65,040
Interest income 9,817 7,926 3,469
Other income 12,950 30,300 12,000
Total income (loss) (9,348,400) 4,424,226 12,303,709
Expenses      
General Partner management fees (Note 3) 807,686 1,275,573 931,307
Professional fees 130,520 244,950 273,067
Registration fees 44,044 9,472 9,540
Brokerage commissions 21,804 27,427 13,314
License fees 20,192 49,913 37,079
Directors' fees 14,038 17,340 30,284
Other expenses 12,094 13,049 5,193
Total expenses 1,050,378 1,637,724 1,299,784
Net income (loss) $ (10,398,778) $ 2,786,502 $ 11,003,925
Net income (loss) per limited partnership unit (3.65) 0.55 2.54
Net income (loss) per weighted average limited partnership unit (3.24) 0.57 2.77
Weighted average limited partnership units outstanding 3,205,464 4,893,699 3,975,616