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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 $ (10,510,330) $ 18,909,681 $ (20,620,370) $ 23,110,490
Change in unrealized gain (loss) on open futures contracts 1,697,740 4,187,820 3,364,120 6,533,930
Dividend income 38,427 13,565 78,655 17,320
Interest income 138,715 83,874 239,850 136,912
ETF transaction fees 3,500 3,500 4,550 8,050
Total income (loss) (8,631,948) 23,198,440 (16,933,195) 29,806,702
Expenses        
General Partner management fees (Note 3) 186,713 231,921 385,423 410,023
Professional fees 59,486 38,229 186,544 76,457
Brokerage commissions 37,844 41,196 67,768 94,468
Directors' fees and insurance 3,231 3,265 6,250 5,713
Total expenses 287,274 314,611 645,985 586,661
Expense waiver (Note 3) (63,219) (36,554) (183,478) (96,316)
Net expenses 224,055 278,057 462,507 490,345
Net income (loss) $ (8,856,003) $ 22,920,383 $ (17,395,702) $ 29,316,357
Net income (loss) per limited partnership share $ (1.53) $ 2.55 $ (2.73) $ 2.64
Net income (loss) per weighted average limited partnership share $ (1.21) $ 2.62 $ (2.41) $ 3.40
Weighted average limited partnership shares outstanding 7,294,505 8,739,011 7,230,110 8,616,484