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Condensed Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed commodity futures contracts $ 288,200,922 $ 1,138,807,507 $ 1,601,968,924 $ (2,508,492,651)
Change in unrealized gain (loss) on open commodity futures contracts (148,251,631) (1,048,629,449) (73,910,705) 59,173,693
Dividend income 113,383 383,360 322,330 1,930,681
Interest income* [1] 195,291 1,020,740 701,254 8,026,317
ETF transaction fees 37,000 55,000 133,000 239,546
Total Income (Loss) 140,294,965 91,637,158 1,529,214,803 (2,439,122,414)
Expenses        
General Partner management fees (Note 3) 3,142,605 4,893,531 10,408,092 11,185,461
Professional fees 1,919,476 1,045,976 5,393,074 1,868,951
Brokerage commissions 245,933 783,270 901,518 5,462,795
Directors' fees and insurance 215,809 101,486 532,153 295,690
License fees 104,753 163,118 346,936 372,849
Registration fees 0 759,225 1,260,041 2,237,939
Total Expenses 5,628,576 7,746,606 18,841,814 21,423,685
Net Income (Loss) $ 134,666,389 $ 83,890,552 $ 1,510,372,989 $ (2,460,546,099)
Net Income (Loss) per limited partner share $ 2.78 $ 0.47 $ 19.58 $ (73.78)
Net Income (Loss) per weighted average limited partner share $ 2.39 $ 0.57 $ 21.27 $ (22.18)
Weighted average limited partner shares outstanding 56,448,603 147,624,690 71,016,643 110,925,391
[1] Interest income does not exceed paid in kind of 5%.