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Condensed Statements of Operations - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Gain (loss) on trading of commodity futures contracts:    
Realized gain (loss) on closed futures contracts $ (9,396,160) $ (6,344,216)
Change in unrealized gain (loss) on open futures contracts 10,861,510 1,240,277
Dividend income 5,400 1,776
Interest income 44,057 4,053
ETF transaction fees 7,350 5,950
Total income (loss) 1,522,157 (5,092,160)
Expenses    
General Partner management fees (Note 3) 131,164 92,815
Professional fees 22,955 20,619
Brokerage commissions 8,669 6,437
Directors' fees and insurance 2,281 2,905
License fees 3,279 2,320
Total expenses 168,348 125,096
Net income (loss) $ 1,353,809 $ (5,217,256)
Net income (loss) per limited partnership share $ (0.65) $ (2.63)
Net income (loss) per weighted average limited partnership share $ 0.24 $ (2.08)
Weighted average limited partnership shares outstanding 5,659,890 2,506,111