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Condensed Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ (2,593,212) $ (5,696,095) $ (11,989,372) $ (12,040,311)
Change in unrealized gain (loss) on open futures contracts 22,450,323 14,570,994 33,311,833 15,811,271
Dividend income 13,521 1,795 18,921 3,571
Interest income 74,966 8,891 119,023 12,944
ETF transaction fees 2,450 2,800 9,800 8,750
Total income (loss) 19,948,048 8,888,385 21,470,205 3,796,225
Expenses        
General Partner management fees (Note 3) 177,299 127,382 308,463 220,197
Professional fees 20,021 37,841 42,976 58,460
Brokerage commissions 3,747 3,728 12,416 10,165
Directors' fees and insurance 2,754 2,458 5,035 5,363
License fees 4,433 3,186 7,712 5,506
Total expenses 208,254 174,595 376,602 299,691
Net income (loss) $ 19,739,794 $ 8,713,790 $ 21,093,603 $ 3,496,534
Net income (loss) per limited partnership share $ 2.99 $ 2.88 $ 2.34 $ 0.25
Net income (loss) per weighted average limited partnership share $ 3.04 $ 2.75 $ 3.47 $ 1.23
Weighted average limited partnership shares outstanding 6,497,802 3,170,330 6,078,846 2,840,055