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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ (479,014) $ (11,739) $ 229,715
Change in unrealized gain (loss) on open futures contracts (389,575) 522,819 (3,364,926)
Dividend income 11,525 24,807 27,445
Interest income* [1] 81,092 86,283 53,398
ETF transaction fees 700 2,800 2,450
Total income (loss) (775,272) 624,970 (3,051,918)
Expenses      
General Partner management fees (Note 3) 32,545 48,189 78,805
Professional fees 77,834 65,849 71,759
Brokerage commissions 1,231 1,334 2,209
Directors' fees and insurance 1,096 1,447 1,929
License fees 651 964 1,576
Total expenses 113,357 117,783 156,278
Expense waiver (Note 3) (74,303) (59,956) (61,713)
Net expenses 39,054 57,827 94,565
Net income (loss) $ (814,326) $ 567,143 $ (3,146,483)
Net income (loss) per limited partnership share $ (1.83) $ 1.00 $ (2.49)
Net income (loss) per weighted average limited partnership share $ (1.80) $ 0.84 $ (3.06)
Weighted average limited partnership shares outstanding 452,329 671,507 1,027,534
[1] Interest income does not exceed paid in kind of 5%.