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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ (4,153,140) $ 12,264,400 $ 27,857,540
Change in unrealized gain (loss) on open futures contracts (11,877,420) 3,255,030 9,775,220
Dividend income 408,899 173,888 66,811
Interest income [1] 1,284,171 654,768 290,408
ETF transaction fees 13,300 10,850 14,350
Total income (loss) (14,324,190) 16,358,936 38,004,329
Expenses      
General Partner management fees (Note 3) 721,836 756,539 832,667
Professional fees 111,160 336,708 179,655
Brokerage commissions 98,880 132,707 165,409
Directors' fees and insurance 15,970 13,325 11,565
Total expenses 947,846 1,239,279 1,189,296
Expense waiver (Note 3) (81,642) (331,433) (190,095)
Net expenses 866,204 907,846 999,201
Net income (loss) $ (15,190,394) $ 15,451,090 $ 37,005,128
Net income (loss) per limited partnership share $ (3.00) $ 2.48 $ 3.48
Net income (loss) per weighted average limited partnership share $ (3.14) $ 2.24 $ 4.49
Weighted average limited partnership shares outstanding 4,836,438 6,888,630 8,243,989
[1] Interest income does not exceed paid in kind of 5%.