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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ (24,569,061) $ 402,190 $ 6,302,760
Change in unrealized gain (loss) on open futures contracts (2,875,569) (18,738,510) 85,540
Dividend income 5,737 10,129 18,055
Interest income 43,003 5,708 6,576
ETF transaction fees 16,450 3,150 8,050
Total income (loss) (27,379,440) (18,317,333) 6,420,981
Expenses      
General Partner management fees (Note 3) 433,957 316,392 510,978
Professional fees 101,867 142,796 207,412
Brokerage commissions 19,025 4,643 9,848
Directors' fees and insurance 9,808 15,649 19,340
License fees 10,849 7,910 12,774
Registration fees 0 1,350 82,385
Total expenses 575,506 488,740 842,737
Net income (loss) $ (27,954,946) $ (18,806,073) $ 5,578,244
Net income (loss) per limited partnership share $ (9.59) $ (16.24) $ 3.02
Net income (loss) per weighted average limited partnership share $ (8.87) $ (14.92) $ 2.71
Weighted average limited partnership shares outstanding 3,151,781 1,260,685 2,061,096