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Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ (42,291) $ (50,843) $ (466,362) $ 605,720
Change in unrealized gain (loss) on open futures contracts (8,079) 38,153 575,122 (3,071,320)
Dividend income 5,210 7,678 18,105 20,029
Interest income [1] 23,023 14,821 61,842 37,441
ETF transaction fees 700 0 2,100 1,400
Total income (loss) (21,437) 9,809 190,807 (2,406,730)
Expenses        
General Partner management fees (Note 3) 10,983 17,818 37,059 62,706
Professional fees 13,202 21,789 49,448 52,800
Brokerage commissions 434 507 1,219 1,604
Directors' fees and insurance 341 500 1,094 1,432
License fees 220 356 741 1,254
Total expenses 25,180 40,970 89,561 119,796
Expense waiver (Note 3) (11,999) (19,588) (45,090) (44,548)
Net expenses 13,181 21,382 44,471 75,248
Net income (loss) $ (34,618) $ (11,573) $ 146,336 $ (2,481,978)
Net income (loss) per limited partnership share $ (0.04) $ (0.01) $ 0.19 $ (1.74)
Net income (loss) per weighted average limited partnership share $ (0.06) $ (0.01) $ 0.21 $ (2.31)
Weighted average limited partnership shares outstanding 623,913 950,000 709,890 1,075,458
[1] Interest income does not exceed paid in kind of 5%.