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Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ (10,888,200) $ (26,619,172) $ 12,222,290 $ (21,353,500)
Change in unrealized gain (loss) on open futures contracts 9,361,660 (2,487,188) 15,895,590 1,982,630
Realized gain (loss) on short-term investments 0 10 0 10
Dividend income 17,861 312 35,181 1,831
Interest income 77,019 16,385 213,931 39,435
ETF transaction fees 1,400 4,200 9,450 18,200
Total income (loss) (1,430,260) (29,085,453) 28,376,442 (19,311,394)
Expenses        
General Partner management fees (Note 3) 209,072 168,387 619,095 537,677
Professional fees 47,399 38,648 123,856 108,954
Brokerage commissions 36,202 28,015 130,670 83,780
Directors' fees and insurance 2,923 2,657 8,636 8,233
Total expenses 295,596 237,707 882,257 738,644
Expense waiver (Note 3) (43,026) (32,885) (139,342) (91,326)
Net expenses 252,570 204,822 742,915 647,318
Net income (loss) $ (1,682,830) $ (29,290,275) $ 27,633,527 $ (19,958,712)
Net income (loss) per limited partnership share $ (0.27) $ (6.07) $ 2.37 $ (5.83)
Net income (loss) per weighted average limited partnership share $ (0.21) $ (5.92) $ 3.29 $ (4.3)
Weighted average limited partnership shares outstanding 7,966,848 4,947,283 8,398,358 4,637,546