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Condensed Statements of Operations - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Gain (loss) on trading of commodity futures contracts:    
Realized gain (loss) on closed futures contracts $ 67,078,910 $ (78,689,338)
Change in unrealized gain (loss) on open futures contracts (56,078,080) (15,295,497)
Realized gain (loss) on short-term investments (13,490) (1,172)
Dividend income 56,967 19,279
Interest income [1] 1,394,568 640,407
ETF transaction fees 62,000 84,000
Total income (loss) 12,500,875 (93,242,321)
Expenses    
General Partner management fees (Note 3) 648,691 739,810
Professional fees 238,684 360,450
Brokerage commissions 445,015 419,698
Directors' fees and insurance 15,378 15,207
License fees 16,217 18,495
Registration fees 39,269 82,458
Total expenses 1,403,254 1,636,118
Net income (loss) $ 11,097,621 $ (94,878,439)
Net income (loss) per limited partnership share $ (0.8) $ (6.90) [2]
Net income (loss) per weighted average limited partnership share $ 0.59 $ (5.76) [2]
Weighted average limited partnership shares outstanding 18,881,532 16,466,619 [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.