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Note 6 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
12 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Balance at beginning of year $ 75,000 $ 85,000
Liabilities accrued for warranties issued during the year 97,501 74,555
Warranty claims paid during the period (52,465) (65,592)
Changes in liability for pre-existing warranties during the year (45,036) (18,963)
Balance at end of year $ 75,000 $ 75,000