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Condensed Statements of Operations - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Gain (loss) on trading of commodity futures contracts:    
Realized gain (loss) on closed futures contracts $ (51,559,207) $ 67,078,910
Change in unrealized gain (loss) on open futures contracts 50,133,597 (56,078,080)
Realized gain (loss) on short-term investments 0 (13,490)
Dividend income 112,110 56,967
Interest income 1,610,320 1,394,568
ETF transaction fees 37,000 62,000
Total income (loss) 333,820 12,500,875
Expenses    
General Partner management fees (Note 3) 432,915 648,691
Professional fees 238,685 238,684
Brokerage commissions 271,564 445,015
Directors' fees and insurance 17,201 15,378
License fees 10,823 16,217
Registration fees 25,390 39,269
Total expenses 996,578 1,403,254
Net income (loss) $ (662,758) $ 11,097,621
Net income (loss) per limited partnership share $ (0.93) $ (0.80)
Net income (loss) per weighted average limited partnership share $ (0.06) $ 0.59
Weighted average limited partnership shares outstanding 11,760,144 18,881,532