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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 $ 4,200,809 $ 1,725,380
Change in unrealized gain (loss) on open futures contracts 2,346,110 (4,188,770)
Dividend income 3,755 522
Interest income 53,038 8,117
ETF transaction fees 4,550 10,500
Total income (loss) 6,608,262 (2,444,251)
Expenses    
General Partner management fees (Note 3) 178,102 153,435
Professional fees 38,228 31,278
Brokerage commissions 53,272 25,577
Directors' fees and insurance 2,448 2,547
Total expenses 272,050 212,837
Expense waiver (Note 3) (59,762) (27,677)
Net expenses 212,288 185,160
Net income (loss) $ 6,395,974 $ (2,629,411)
Net income (loss) per limited partnership share $ 0.09 $ (1.91)
Net income (loss) per weighted average limited partnership share $ 0.75 $ (0.67)
Weighted average limited partnership shares outstanding 8,493,956 3,921,111