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Condensed Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ (53,152,570) $ 23,836,648 $ (104,711,777) $ 90,915,558
Change in unrealized gain (loss) on open futures contracts 11,805,850 (4,773,725) 61,939,447 (60,851,805)
Realized gain (loss) on short-term investments 93 0 93 (13,490)
Dividend income 37,004 109,975 149,114 166,942
Interest income [1] 1,611,194 1,292,089 3,221,514 2,686,657
ETF transaction fees 20,000 47,000 57,000 109,000
Total income (loss) (39,678,429) 20,511,987 (39,344,609) 33,012,862
Expenses        
General Partner management fees (Note 3) 412,293 533,014 845,208 1,181,705
Professional fees 241,337 232,538 480,022 471,222
Brokerage commissions 251,098 366,890 522,662 811,905
Directors' fees and insurance 13,382 17,345 30,583 32,723
License fees 10,307 13,326 21,130 29,543
Registration fees 15,429 14,556 40,819 53,825
Total expenses 943,846 1,177,669 1,940,424 2,580,923
Net income (loss) $ (40,622,275) $ 19,334,318 $ (41,285,033) $ 30,431,939
Net income (loss) per limited partnership share $ (3.59) $ 1.17 $ (4.52) $ 0.37
Net income (loss) per weighted average limited partnership share $ (3.19) $ 1.25 $ (3.37) $ 1.57
Weighted average limited partnership shares outstanding 12,742,830 15,418,654 12,254,201 19,395,634
[1] Interest income does not exceed paid in kind of 5%.