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Condensed Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ (27,757,990) $ 94,006,028 $ (106,447,328) $ 86,671,888
Change in unrealized gain (loss) on open futures contracts (16,848,660) 58,739,254 (32,144,157) (47,814,042)
Realized gain (loss) on short-term investments 0 0 (1,172) 0
Dividend income 34,328 26,867 53,607 44,718
Interest income 766,409 432,045 1,406,816 699,204
ETF transaction fees 60,000 21,000 144,000 46,000
Total income (loss) (43,745,913) 153,225,194 (136,988,234) 39,647,768
Expenses        
General Partner management fees (Note 3) 660,512 819,510 1,400,322 1,545,668
Professional fees 362,158 67,459 722,608 118,006
Brokerage commissions 380,958 522,847 800,656 1,085,522
Directors' fees and insurance 14,400 40,623 29,607 62,146
License fees 16,513 20,488 35,008 38,642
Registration fees 39,266 100,645 121,724 201,290
Total expenses 1,473,807 1,571,572 3,109,925 3,051,274
Net income (loss) $ (45,219,720) $ 151,653,622 $ (140,098,159) $ 36,596,494
Net income (loss) per limited partnership share $ (0.79) $ 2.01 $ (2.51) $ (0.04)
Net income (loss) per weighted average limited partnership share $ (0.74) $ 1.95 $ (2.21) $ 0.50
Weighted average limited partnership shares outstanding 60,804,938 77,732,410 63,321,725 72,876,916