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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed commodity futures contracts $ 76,578,011 $ (5,665,084) $ 20,594,140
Change in unrealized gain (loss) on open commodity futures contracts 33,279,859 19,374,784 (26,844,760)
Realized gain (loss) on short-term investments 1,240 0 (21)
Dividend income 158,704 241,099 212,708
Interest income [1] 252,605 976,513 1,173,556
ETF transaction fees 33,264 4,550 5,950
Total Income (Loss) 110,303,683 14,931,862 (4,858,427)
Expenses      
General Partner management fees (Note 3) 1,080,769 337,314 473,218
Professional fees 231,301 131,501 144,701
Brokerage commissions 102,980 7,261 6,045
Directors' fees and insurance 17,435 13,028 13,806
License fees 27,019 8,433 11,830
Registration fees 124,835 0 0
Total expenses 1,584,339 497,537 649,600
Net Income (Loss) $ 108,719,344 $ 14,434,325 $ (5,508,027)
Net Income (Loss) per limited partner share $ (5.72) $ 5.13 $ (3.23)
Net Income (Loss) per weighted average limited partner share $ 8.83 $ 5.52 $ (1.62)
Weighted average limited partner shares outstanding 12,315,890 2,615,479 3,390,137
[1] Interest income does not exceed paid in kind of 5%