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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 $ (10,110,040) $ 4,200,809
Change in unrealized gain (loss) on open futures contracts 1,666,380 2,346,110
Dividend income 40,228 3,755
Interest income 101,135 53,038
ETF transaction fees 1,050 4,550
Total income (loss) (8,301,247) 6,608,262
Expenses    
General Partner management fees (Note 3) 198,710 178,102
Professional fees 127,058 38,228
Brokerage commissions 29,924 53,272
Directors' fees and insurance 3,019 2,448
Total expenses 358,711 272,050
Expense waiver (Note 3) (120,259) (59,762)
Net expenses 238,452 212,288
Net income (loss) $ (8,539,699) $ 6,395,974
Net income (loss) per limited partnership share $ (1.2) $ 0.09
Net income (loss) per weighted average limited partnership share $ (1.19) $ 0.75
Weighted average limited partnership shares outstanding 7,165,000 8,493,956