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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 $ 5,625,960 $ (10,110,040)
Change in unrealized gain (loss) on open futures contracts (1,175,940) 1,666,380
Dividend income 70,829 40,228
Interest income [1] 249,033 101,135
ETF transaction fees 2,800 1,050
Total income (loss) 4,772,682 (8,301,247)
Expenses    
General Partner management fees (Note 3) 175,198 198,710
Professional fees 67,167 127,058
Brokerage commissions 23,732 29,924
Directors' fees and insurance 3,364 3,019
Total expenses 269,461 358,711
Expense waiver (Note 3) (59,168) (120,259)
Net expenses 210,293 238,452
Net income (loss) $ 4,562,389 $ (8,539,699)
Net income (loss) per limited partnership share $ 0.95 $ (1.2)
Net income (loss) per weighted average limited partnership share $ 0.88 $ (1.19)
Weighted average limited partnership shares outstanding 5,158,889 7,165,000
[1] Interest income does not exceed paid in kind of 5%.