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Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed commodity futures contracts $ 74,366,067 $ 46,921,535 $ (152,858,513) $ (57,790,242)
Change in unrealized gain (loss) on open commodity futures contracts (20,009,146) (31,565,385) 2,115,554 30,374,062
Realized gain (loss) on short investments       93
Dividend income 58,452 220,411 831,631 369,525
Interest income [1] 125,322 1,473,249 1,805,898 4,694,763
ETF transaction fees 32,000 23,000 118,070 80,000
Total Income (Loss) 54,572,695 17,072,810 (147,987,360) (22,271,799)
Expenses        
General Partner management fees (Note 3) 551,554 459,462 1,820,959 1,304,670
Professional fees 162,876 161,187 514,887 641,209
Brokerage commissions 369,980 290,231 1,538,224 812,893
Directors' fees and insurance 19,075 18,785 63,273 49,368
License fees 13,789 11,487 45,524 32,617
Registration fees 101,400 34,621 281,400 75,440
Total Expenses 1,218,674 975,773 4,264,267 2,916,197
Net Income (Loss) $ 53,354,021 $ 16,097,037 $ (152,251,627) $ (25,187,996)
Net Income (Loss) per limited partner share $ 1.10 $ 0.10 $ (5.56) $ (4.42)
Net Income (Loss) per weighted average limited partner share $ 1.73 $ 1.06 $ (4.77) $ (1.90)
Weighted average limited partner shares outstanding 30,816,110 15,161,762 31,924,734 13,234,039
[1] *     Interest income does not exceed paid in kind of 5%.