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Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ (390,455) $ 501,686 $ 6,228,639 $ (11,487,686)
Change in unrealized gain (loss) on open futures contracts 10,164,685 (3,306,626) (17,358,999) 30,005,207
Dividend income 51,363 20,080 137,832 39,001
Interest income [1] 219,011 77,074 471,942 196,097
ETF transaction fees 2,800 2,800 7,350 12,600
Total income (loss) 10,047,404 (2,704,986) (10,513,236) 18,765,219
Expenses        
General Partner management fees (Note 3) 168,628 174,407 501,114 482,870
Professional fees 33,197 20,210 158,997 63,186
Brokerage commissions 4,643 4,869 13,484 17,285
Directors' fees and insurance 3,844 2,860 10,432 7,895
License fees 4,216 4,360 12,528 12,072
Total expenses 214,528 206,706 696,555 583,308
Net income (loss) $ 9,832,876 $ (2,911,692) $ (11,209,791) $ 18,181,911
Net income (loss) per limited partnership share $ 1.52 $ (0.59) $ (2.08) $ 1.75
Net income (loss) per weighted average limited partnership share $ 1.53 $ (0.45) $ (1.81) $ 2.94
Weighted average limited partnership shares outstanding 6,439,130 6,411,413 6,179,670 6,190,511
[1] Interest income does not exceed paid in kind of 5%.