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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed commodity futures contracts $ 79,019,530 $ 150,117,880 $ 119,917,640
Change in unrealized gain (loss) on open commodity futures contracts 2,763,860 10,285,810 1,034,920
Dividend income 1,727,518 47,073 253,607
Interest income [1] 1,678,149 60,831 411,917
ETF transaction fees 26,950 28,350 48,671
Total Income (Loss) 85,216,007 160,539,944 121,666,755
Expenses      
General Partner management fees 1,977,435 2,259,549 2,152,372
Professional fees 239,277 411,680 280,082
Brokerage commissions 181,930 277,795 548,601
Directors' fees and insurance 82,611 74,951 28,104
Other fees 6,375    
Registration fees 157,620 259,150 234,290
Total Expenses 2,645,248 3,283,125 3,243,449
Expense waiver   (202,151) (660,603)
Net Expenses 2,645,248 3,080,974 2,582,846
Net Income (Loss) $ 82,570,759 $ 157,458,970 $ 119,083,909
Net Income (Loss) per limited partner share $ 7.39 $ 7.96 $ (8.00)
Net Income (Loss) per weighted average limited partner share $ 9.19 $ 9.23 $ 4.45
Weighted average limited partner shares outstanding 8,988,493 17,067,945 26,763,425
[1] Interest income does not exceed paid in kind of 5%.