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Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ 5,214,730 $ 18,646,860 $ 22,736,110 $ (1,973,510)
Change in unrealized gain (loss) on open futures contracts (770,460) (3,290,500) 278,490 73,620
Dividend income 136,916 45,263 307,484 123,918
Interest income [1] 347,993 197,412 887,974 437,262
ETF transaction fees 3,500 3,850 9,100 8,400
Total income (loss) 4,932,679 15,602,885 24,219,158 (1,330,310)
Expenses        
General Partner management fees (Note 3) 188,880 187,877 546,608 573,300
Professional fees 8,822 65,296 102,340 251,840
Brokerage commissions 24,990 35,755 73,083 103,523
Directors' fees and insurance 4,317 3,476 11,712 9,726
Total expenses 227,009 292,404 733,743 938,389
Expense waiver (Note 3) (599) (66,850) (78,058) (250,328)
Net expenses 226,410 225,554 655,685 688,061
Net income (loss) $ 4,706,269 $ 15,377,331 $ 23,563,473 $ (2,018,371)
Net income (loss) per limited partnership share $ 1.07 $ 2.22 $ 5.10 $ (0.51)
Net income (loss) per weighted average limited partnership share $ 1.00 $ 2.13 $ 4.86 $ (0.28)
Weighted average limited partnership shares outstanding 4,703,261 7,221,739 4,851,648 7,227,289
[1] Interest income does not exceed paid in kind of 5%.