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Condensed Statements of Operations - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Gain (loss) on trading of commodity futures contracts:    
Realized gain (loss) on closed commodity futures contracts $ 90,150,900 $ (66,688,930)
Change in unrealized gain (loss) on open commodity futures contracts (12,779,710) (12,321,580)
Dividend income 8,953 70,258
Interest income [1] 21,403 227,012
ETF transaction fees 10,500 14,700
Total Income (Loss) 77,412,046 (78,698,540)
Expenses    
General Partner management fees (Note 3) 663,973 153,554
Professional fees 103,719 36,026
Brokerage commissions 95,085 46,679
Directors' fees and insurance 9,195 5,147
Registration fees 63,900 0
Total Expenses 935,872 241,406
Expense waiver (Note 3) (139,105) (56,591)
Net Expenses 796,767 184,815
Net Income (Loss) $ 76,615,279 $ (78,883,355)
Net Income (Loss) per limited partner share $ 2.93 $ (12.94)
Net Income (Loss) per weighted average limited partner share $ 3.24 $ (13.99)
Weighted average limited partner shares outstanding 23,677,222 5,637,363
[1] Interest income does not exceed paid in kind of 5%.