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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ (7,435,894) $ (24,569,061) $ 402,190
Change in unrealized gain (loss) on open futures contracts 37,249,404 (2,875,569) (18,738,510)
Dividend income 69,128 5,737 10,129
Interest income 280,850 43,003 5,708
ETF transaction fees 15,750 16,450 3,150
Total income (loss) 30,179,238 (27,379,440) (18,317,333)
Expenses      
General Partner management fees (Note 3) 668,511 433,957 316,392
Professional fees 87,599 101,867 142,796
Brokerage commissions 22,207 19,025 4,643
Directors' fees and insurance 10,843 9,808 15,649
License fees 16,713 10,849 7,910
Registration fees 0 0 1,350
Total expenses 805,873 575,506 488,740
Net income (loss) $ 29,373,365 $ (27,954,946) $ (18,806,073)
Net income (loss) per limited partnership share $ 3.39 $ (9.59) $ (16.24)
Net income (loss) per weighted average limited partnership share $ 4.69 $ (8.87) $ (14.92)
Weighted average limited partnership shares outstanding 6,263,251 3,151,781 1,260,685