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Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ 46,921,535 $ (6,801,075) $ (57,790,242) $ 84,114,483
Change in unrealized gain (loss) on open futures contracts (31,565,385) 25,731,585 30,374,062 (35,120,220)
Realized gain (loss) on short-term investments 0 (2,291) 93 (15,781)
Dividend income 220,411 157,458 369,525 324,400
Interest income [1] 1,473,249 1,526,049 4,694,763 4,212,706
ETF transaction fees 23,000 34,000 80,000 143,000
Total income (loss) 17,072,810 20,645,726 (22,271,799) 53,658,588
Expenses        
General Partner management fees (Note 3) 459,462 504,862 1,304,670 1,686,567
Professional fees 161,187 225,588 641,209 696,810
Brokerage commissions 290,231 298,780 812,893 1,110,685
Directors' fees and insurance 18,785 17,535 49,368 50,258
License fees 11,487 12,621 32,617 42,164
Registration fees 34,621 14,717 75,440 68,542
Total expenses 975,773 1,074,103 2,916,197 3,655,026
Net income (loss) $ 16,097,037 $ 19,571,623 $ (25,187,996) $ 50,003,562
Net income (loss) per limited partnership share $ 0.10 $ 1.15 $ (4.42) $ 1.52
Net income (loss) per weighted average limited partnership share $ 1.06 $ 1.37 $ (1.90) $ 2.83
Weighted average limited partnership shares outstanding 15,161,762 14,283,501 13,234,039 17,672,864
[1] Interest income does not exceed paid in kind of 5%.