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Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ (129,946) $ (42,291) $ (180,182) $ (466,362)
Change in unrealized gain (loss) on open futures contracts (3,325) (8,079) (497,248) 575,122
Dividend income 2,629 5,210 9,427 18,105
Interest income [1] 19,149 23,023 65,314 61,842
ETF transaction fees 0 700 350 2,100
Total income (loss) (111,493) (21,437) (602,339) 190,807
Expenses        
General Partner management fees (Note 3) 7,641 10,983 25,067 37,059
Professional fees 16,880 13,202 60,952 49,448
Brokerage commissions 312 434 948 1,219
Directors' fees and insurance 271 341 814 1,094
License fees 152 220 501 741
Total expenses 25,256 25,180 88,282 89,561
Expense waiver (Note 3) (16,088) (11,999) (58,202) (45,090)
Net expenses 9,168 13,181 30,080 44,471
Net income (loss) $ (120,661) $ (34,618) $ (632,419) $ 146,336
Net income (loss) per limited partnership share $ (0.27) $ (0.04) $ (1.42) $ 0.19
Net income (loss) per weighted average limited partnership share $ (0.27) $ (0.06) $ (1.40) $ 0.21
Weighted average limited partnership shares outstanding 450,000 623,913 453,297 709,890
[1] Interest income does not exceed paid in kind of 5%.