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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 $ 150,117,880 $ 119,917,640 $ 18,175,420
Change in unrealized gain (loss) on open commodity futures contracts 10,285,810 1,034,920 7,451,120
Dividend income 47,073 253,607 533,922
Interest income [1] 60,831 411,917 1,383,419
ETF transaction fees 28,350 48,671 6,650
Total Income (Loss) 160,539,944 121,666,755 27,550,531
Expenses      
General Partner management fees (Note 3) 2,259,549 2,152,372 656,053
Professional fees 411,680 280,082 90,200
Brokerage commissions 277,795 548,601 101,742
Directors' fees and insurance 74,951 28,104 19,301
Registration fees 259,150 234,290 0
Total Expenses 3,283,125 3,243,449 867,296
Expense waiver (Note 3) (202,151) (660,603) (80,032)
Net Expenses 3,080,974 2,582,846 787,264
Net Income (Loss) $ 157,458,970 $ 119,083,909 $ 26,763,267
Net Income (Loss) per limited partner share $ 7.96 $ (8.00) $ 5.73
Net Income (Loss) per weighted average limited partner share $ 9.23 $ 4.45 $ 5.76
Weighted average limited partner shares outstanding 17,067,945 26,763,425 4,646,301
[1] Interest income does not exceed paid in kind of 5%.