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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed commodity futures contracts $ 6,104,950 $ (206,518,620) $ (126,561,127)
Change in unrealized gain (loss) on open commodity futures contracts 15,817,312 6,313,791 46,252,567
Realized gain (loss) on short-term investments     93
Dividend income 48,789 832,573 582,039
Interest income* [1] 70,125 1,846,120 6,027,693
ETF transaction fees 107,000 158,070 120,000
Total Income (Loss) 22,148,176 (197,368,066) (73,578,735)
Expenses      
General Partner management fees (Note 3) 2,024,410 2,413,189 1,820,281
Professional fees 693,849 647,911 802,399
Brokerage commissions 794,337 1,879,043 1,155,153
Directors' fees and insurance 81,479 83,030 70,739
License fees 50,610 60,330 45,507
Registration fees 103,290 364,200 144,440
Total Expenses 3,747,975 5,447,703 4,038,519
Net Income (Loss) $ 18,400,201 $ (202,815,769) $ (77,617,254)
Net Income (Loss) per limited partner share $ 3.19 $ (7.71) $ (7.44)
Net Income (Loss) per weighted average limited partner share $ 0.69 $ (6.11) $ (5.39)
Weighted average limited partner shares outstanding 26,747,876 33,208,424 14,401,574
[1] Interest income does not exceed paid in kind of 5%.