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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ (41,811,240) $ (19,750,710) $ 3,338,310
Change in unrealized gain (loss) on open futures contracts (1,095,250) (6,375,760) (710,660)
Realized gain (loss) on short-term investments 10 17 0
Dividend income 1,936 1,252 6,856
Interest income 63,675 10,869 5,073
ETF transaction fees 24,150 15,050 18,900
Total income (loss) (42,816,719) (26,099,282) 2,658,479
Expenses      
General Partner management fees (Note 3) 690,367 286,806 299,440
Professional fees 147,894 178,177 140,442
Brokerage commissions 114,922 27,058 29,674
Directors' fees and insurance 10,575 9,150 9,012
Total expenses 963,758 501,191 478,568
Expense waiver (Note 3) (135,317) (148,604) (80,653)
Net expenses 828,441 352,587 397,915
Net income (loss) $ (43,645,160) $ (26,451,869) $ 2,260,564
Net income (loss) per limited partnership share $ (10.17) $ (21.42) $ 2.83
Net income (loss) per weighted average limited partnership share $ (9.02) $ (26.86) $ 2.35
Weighted average limited partnership shares outstanding 4,836,438 984,795 963,425