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Condensed Statements of Operations - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Gain (loss) on trading of commodity futures contracts:    
Realized gain (loss) on closed futures contracts $ 4,474,975 $ 6,144,519
Change in unrealized gain (loss) on open futures contracts 1,864,045 (17,188,069)
Dividend income 54,110 43,025
Interest income [1] 240,855 108,478
ETF transaction fees 2,450 1,750
Total income (loss) 6,636,435 (10,890,297)
Expenses    
General Partner management fees (Note 3) 127,296 173,067
Professional fees 38,096 72,000
Brokerage commissions 574 4,132
Directors' fees and insurance 3,231 3,120
License fees 3,182 4,327
Total expenses 172,379 256,646
Net income (loss) $ 6,464,056 $ (11,146,943)
Net income (loss) per limited partnership share $ 1.6 $ (1.87)
Net income (loss) per weighted average limited partnership share $ 1.64 $ (1.85)
Weighted average limited partnership shares outstanding 3,952,778 6,039,444
[1] Interest income does not exceed paid in kind of 5%.