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Condensed Statements of Operations - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Gain (loss) on trading of commodity futures contracts:    
Realized gain (loss) on closed futures contracts $ (124,698,620) $ (51,559,207)
Change in unrealized gain (loss) on open futures contracts (8,450,660) 50,133,597
Dividend income 669,061 112,110
Interest income [1] 1,077,531 1,610,320
ETF transaction fees 44,000 37,000
Total income (loss) (131,358,688) 333,820
Expenses    
General Partner management fees (Note 3) 688,156 432,915
Professional fees 159,436 238,685
Brokerage commissions 572,700 271,564
Directors' fees and insurance 24,503 17,201
License fees 17,204 10,823
Registration fees 68,250 25,390
Total expenses 1,530,249 996,578
Net income (loss) $ (132,888,937) $ (662,758)
Net income (loss) per limited partnership share $ (4.48) $ (0.93)
Net income (loss) per weighted average limited partnership share $ (4.20) $ (0.06)
Weighted average limited partnership shares outstanding 31,657,115 11,760,144
[1] Interest income does not exceed paid in kind of 5%.