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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ 220,179,889 $ 1,603,334 $ 70,673,279
Change in unrealized gain (loss) on open futures contracts 231,913,525 (312,173,308) 6,489,790
Realized gain (loss) on short-term investments 11,258 (3,070) 0
Dividend income 2,957,196 2,213,034 3,417,005
Interest income 29,461,116 29,889,589 18,149,989
ETF transaction fees 312,000 358,000 360,000
Total income (loss) 484,834,984 (278,112,421) 99,090,063
Expenses      
General Partner management fees (Note 3) 6,461,273 8,147,165 11,901,563
Professional fees 1,440,997 1,539,401 2,437,428
Brokerage commissions 2,423,017 2,538,611 4,675,687
Directors' fees and insurance 333,741 316,185 357,844
License fees 215,376 271,572 396,719
Registration fees 504,876 349,290 348,425
Total expenses 11,379,280 13,162,224 20,117,666
Net income (loss) $ 473,455,704 $ (291,274,645) $ 78,972,397
Net income (loss) per limited partnership share $ 3.19 $ (2.49) $ 0.37
Net income (loss) per weighted average limited partnership share $ 3.90 $ (2.13) $ 0.31
Weighted average limited partnership shares outstanding 121,247,671 137,006,575 253,222,466