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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ 27,857,540 $ (41,811,240) $ (19,750,710)
Change in unrealized gain (loss) on open futures contracts 9,775,220 (1,095,250) (6,375,760)
Realized gain (loss) on short-term investments 0 10 17
Dividend income 66,811 1,936 1,252
Interest income 290,408 63,675 10,869
ETF transaction fees 14,350 24,150 15,050
Total income (loss) 38,004,329 (42,816,719) (26,099,282)
Expenses      
General Partner management fees (Note 3) 832,667 690,367 286,806
Professional fees 179,655 147,894 178,177
Brokerage commissions 165,409 114,922 27,058
Directors' fees and insurance 11,565 10,575 9,150
Total expenses 1,189,296 963,758 501,191
Expense waiver (Note 3) (190,095) (135,317) (148,604)
Net expenses 999,201 828,441 352,587
Net income (loss) $ 37,005,128 $ (43,645,160) $ (26,451,869)
Net income (loss) per limited partnership share $ 3.48 $ (10.17) $ (21.42)
Net income (loss) per weighted average limited partnership share $ 4.49 $ (9.02) $ (26.86)
Weighted average limited partnership shares outstanding 8,243,989 4,836,438 984,795