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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 $ (8,587) $ (366,417)
Change in unrealized gain (loss) on open futures contracts 104,608 407,377
Dividend income 3,902 7,514
Interest income [1] 23,636 18,595
ETF transaction fees 350 1,050
Total income (loss) 123,909 68,119
Expenses    
General Partner management fees (Note 3) 9,096 14,371
Professional fees 21,915 19,664
Brokerage commissions 372 318
Directors' fees and insurance 328 415
License fees 182 287
Total expenses 31,893 35,055
Expense waiver (Note 3) (20,977) (17,762)
Net expenses 10,916 17,293
Net income (loss) $ 112,993 $ 50,826
Net income (loss) per limited partnership share $ 0.24 $ 0.03
Net income (loss) per weighted average limited partnership share $ 0.25 $ 0.06
Weighted average limited partnership shares outstanding 460,000 837,222
[1] Interest income does not exceed paid in kind of 5%.