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Condensed Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ 23,836,648 $ (27,757,990) $ 90,915,558 $ (106,447,328)
Change in unrealized gain (loss) on open futures contracts (4,773,725) (16,848,660) (60,851,805) (32,144,157)
Realized gain (loss) on short-term investments 0 0 (13,490) (1,172)
Dividend income 109,975 34,328 166,942 53,607
Interest income [1] 1,292,089 766,409 2,686,657 1,406,816
ETF transaction fees 47,000 60,000 109,000 144,000
Total income (loss) 20,511,987 (43,745,913) 33,012,862 (136,988,234)
Expenses        
General Partner management fees (Note 3) 533,014 660,512 1,181,705 1,400,322
Professional fees 232,538 362,158 471,222 722,608
Brokerage commissions 366,890 380,958 811,905 800,656
Directors' fees and insurance 17,345 14,400 32,723 29,607
License fees 13,326 16,513 29,543 35,008
Registration fees 14,556 39,266 53,825 121,724
Total expenses 1,177,669 1,473,807 2,580,923 3,109,925
Net income (loss) $ 19,334,318 $ (45,219,720) $ 30,431,939 $ (140,098,159)
Net income (loss) per limited partnership share $ 1.17 $ (3.15) [2] $ 0.37 $ (10.05) [2]
Net income (loss) per weighted average limited partnership share $ 1.25 $ (2.97) [2] $ 1.57 $ (8.85) [2]
Weighted average limited partnership shares outstanding 15,418,654 15,201,235 [2] 19,395,634 15,830,431 [2]
[1] Interest income does not exceed paid in kind of 5%.
[2] On January 4, 2018, there was a 1-for-4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted to reflect the 1-for-4 reverse share split on a retroactive basis.