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Condensed Statements of Operations - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Gain (loss) on trading of commodity futures contracts:    
Realized gain (loss) on closed futures contracts $ 288,081 $ (1,660,068)
Change in unrealized gain (loss) on open futures contracts (2,185,571) 313,578
Dividend income 5,695 2,592
Interest income 10,633 5,851
ETF transaction fees 1,050 700
Total income (loss) (1,880,112) (1,337,347)
Expenses    
General Partner management fees (Note 3) 25,388 22,545
Professional fees 18,752 26,135
Brokerage commissions 434 958
Directors' fees and insurance 438 530
License fees 508 451
Total expenses 45,520 50,619
Expense waiver (Note 3) (15,053) (23,616)
Net expenses 30,467 27,003
Net income (loss) $ (1,910,579) $ (1,364,350)
Net income (loss) per limited partnership share $ (1.1) $ (0.98)
Net income (loss) per weighted average limited partnership share $ (1.48) $ (1)
Weighted average limited partnership shares outstanding 1,292,222 1,360,440