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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 $ (2,271,270) $ (6,916,714) $ 2,205,950
Change in unrealized gain (loss) on open futures contracts 5,217,980 2,497,914 (6,009,940)
Dividend income 10,786 2,766 2,798
Interest income 32,944 3,669 2,288
ETF transaction fees 1,750 6,650 5,600
Total income (loss) 2,992,190 (4,405,715) (3,793,304)
Expenses      
General Partner management fees (Note 3) 102,306 118,848 143,944
Professional fees 114,167 101,338 150,833
Brokerage commissions 3,451 6,117 3,918
Directors' fees and insurance 2,888 3,140 6,009
License fees 2,046 2,377 2,879
Total expenses 224,858 231,820 307,583
Expense waiver (Note 3) (102,092) (89,122) (128,906)
Net expenses 122,766 142,698 178,677
Net income (loss) $ 2,869,424 $ (4,548,413) $ (3,971,981)
Net income (loss) per limited partnership share $ 2.03 $ (3.97) $ (4.63)
Net income (loss) per weighted average limited partnership share $ 2.07 $ (3.48) $ (3.85)
Weighted average limited partnership shares outstanding 1,387,568 1,305,753 1,031,781