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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ (209,701,928) $ 166,847,846 $ (507,207,439)
Change in unrealized gain (loss) on open futures contracts 18,286,173 (63,973,835) 269,221,125
Realized gain (loss) on short-term investments (1,172) 0 0
Dividend income 148,745 117,246 64,640
Interest income [1] 3,982,312 1,707,539 340,320
ETF transaction fees 277,000 133,000 156,000
Total income (loss) (187,008,870) 104,831,796 (237,425,354)
Expenses      
General Partner management fees (Note 3) 2,972,340 3,263,777 3,645,561
Professional fees 1,390,036 254,042 1,109,436
Brokerage commissions 1,728,440 2,000,888 2,371,433
Directors' fees and insurance 64,982 94,521 118,994
License fees 74,309 81,594 91,139
Registration fees 204,998 404,792 379,106
Total expenses 6,435,105 6,099,614 7,715,669
Net income (loss) $ (193,443,975) $ 98,732,182 $ (245,141,023)
Net income (loss) per limited partnership share [2] $ (13.84) $ 2.42 $ (23.75)
Net income (loss) per weighted average limited partnership share [2] $ (10.54) $ 5.6 $ (19.93)
Weighted average limited partnership shares outstanding [2] 18,356,071 17,619,898 12,299,290
[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. The Statement of Operations have been adjusted for the period shown to reflect the 1-for-4 reverse share split on a retroactive basis.