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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ (11,739) $ 229,715 $ (2,271,270)
Change in unrealized gain (loss) on open futures contracts 522,819 (3,364,926) 5,217,980
Dividend income 24,807 27,445 10,786
Interest income [1] 86,283 53,398 32,944
ETF transaction fees 2,800 2,450 1,750
Total income (loss) 624,970 (3,051,918) 2,992,190
Expenses      
General Partner management fees (Note 3) 48,189 78,805 102,306
Professional fees 65,849 71,759 114,167
Brokerage commissions 1,334 2,209 3,451
Directors' fees and insurance 1,447 1,929 2,888
License fees 964 1,576 2,046
Total expenses 117,783 156,278 224,858
Expense waiver (Note 3) (59,956) (61,713) (102,092)
Net expenses 57,827 94,565 122,766
Net income (loss) $ 567,143 $ (3,146,483) $ 2,869,424
Net income (loss) per limited partnership share $ 1.00 $ (2.49) $ 2.03
Net income (loss) per weighted average limited partnership share $ 0.84 $ (3.06) $ 2.07
Weighted average limited partnership shares outstanding 671,507 1,027,534 1,387,568
[1] Interest income does not exceed paid in kind of 5%.