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Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ (6,801,075) $ 12,090,930 $ 84,114,483 $ (94,356,398)
Change in unrealized gain (loss) on open futures contracts 25,731,585 (23,925,480) (35,120,220) (56,069,637)
Realized gain (loss) on short-term investments (2,291) 0 (15,781) (1,172)
Dividend income 157,458 45,186 324,400 98,793
Interest income [1] 1,526,049 1,073,563 4,212,706 2,480,379
ETF transaction fees 34,000 48,000 143,000 192,000
Total income (loss) 20,645,726 (10,667,801) 53,658,588 (147,656,035)
Expenses        
General Partner management fees (Note 3) 504,862 697,857 1,686,567 2,098,179
Professional fees 225,588 188,839 696,810 911,447
Brokerage commissions 298,780 403,584 1,110,685 1,204,240
Directors' fees and insurance 17,535 15,964 50,258 45,571
License fees 12,621 17,446 42,164 52,454
Registration fees 14,717 41,637 68,542 163,361
Total expenses 1,074,103 1,365,327 3,655,026 4,475,252
Net income (loss) $ 19,571,623 $ (12,033,128) $ 50,003,562 $ (152,131,287)
Net income (loss) per limited partnership share $ 1.15 $ (0.96) [2] $ 1.52 $ (11.00) [2]
Net income (loss) per weighted average limited partnership share $ 1.37 $ (0.69) [2] $ 2.83 $ (9.28) [2]
Weighted average limited partnership shares outstanding 14,283,501 17,509,010 [2] 17,672,864 16,396,106 [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.