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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 $ 8,956,980 $ (124,698,620)
Change in unrealized gain (loss) on open commodity futures contracts 20,781,089 (8,450,660)
Dividend income 8,170 669,061
Interest income [1] 21,859 1,077,531
ETF transaction fees 40,000 44,000
Total Income (Loss) 29,808,098 (131,358,688)
Expenses    
General Partner management fees (Note 3) 520,978 688,156
Professional fees 125,074 159,436
Brokerage commissions 257,862 572,700
Directors' fees and insurance 18,891 24,503
License fees 13,024 17,204
Registration fees 81,000 68,250
Total Expenses 1,016,829 1,530,249
Net Income (Loss) $ 28,791,269 $ (132,888,937)
Net Income (Loss) per limited partner share $ 0.41 $ (4.48)
Net Income (Loss) per weighted average limited partner share $ 0.82 $ (4.20)
Weighted average limited partner shares outstanding 35,046,810 31,657,115
[1] *     Interest income does not exceed paid in kind of 5%.