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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 $ 11,895,420 $ (10,510,330) $ 17,521,380 $ (20,620,370)
Change in unrealized gain (loss) on open futures contracts 2,224,890 1,697,740 1,048,950 3,364,120
Dividend income 99,739 38,427 170,568 78,655
Interest income [1] 290,948 138,715 539,981 239,850
ETF transaction fees 2,800 3,500 5,600 4,550
Total income (loss) 14,513,797 (8,631,948) 19,286,479 (16,933,195)
Expenses        
General Partner management fees (Note 3) 182,530 186,713 357,728 385,423
Professional fees 26,351 59,486 93,518 186,544
Brokerage commissions 24,361 37,844 48,093 67,768
Directors' fees and insurance 4,031 3,231 7,395 6,250
Total expenses 237,273 287,274 506,734 645,985
Expense waiver (Note 3) (18,291) (63,219) (77,459) (183,478)
Net expenses 218,982 224,055 429,275 462,507
Net income (loss) $ 14,294,815 $ (8,856,003) $ 18,857,204 $ (17,395,702)
Net income (loss) per limited partnership share $ 3.08 $ (1.53) $ 4.03 $ (2.73)
Net income (loss) per weighted average limited partnership share $ 3.04 $ (1.21) $ 3.83 $ (2.41)
Weighted average limited partnership shares outstanding 4,697,802 7,294,505 4,927,072 7,230,110
[1] Interest income does not exceed paid in kind of 5%.