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Condensed Statements of Operations - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Gain (loss) on trading of commodity futures contracts:    
Realized gain (loss) on closed futures contracts $ (361,302) $ (8,587)
Change in unrealized gain (loss) on open futures contracts 33,492 104,608
Dividend income 958 3,902
Interest income* [1] 11,093 23,636
ETF transaction fees 0 350
Total income (loss) (315,759) 123,909
Expenses    
General Partner management fees (Note 3) 5,794 9,096
Professional fees 16,699 21,915
Brokerage commissions 131 372
Directors' fees and insurance 236 328
License fees 116 182
Total expenses 22,976 31,893
Expense waiver (Note 3) (16,022) (20,977)
Net expenses 6,954 10,916
Net income (loss) $ (322,713) $ 112,993
Net income (loss) per limited partnership share $ (0.80) $ 0.24
Net income (loss) per weighted average limited partnership share $ (0.81) $ 0.25
Weighted average limited partnership shares outstanding 400,000 460,000
[1] Interest income does not exceed paid in kind of 5%.