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Note 6 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Balance at beginning of year $ 120,000 $ 180,000
Liabilities accrued for warranties issued during the year 140,847 161,815
Warranty claims paid during the period (102,150) (218,426)
Changes in liability for pre-existing warranties during the year (73,697) (3,389)
Balance at end of year $ 85,000 $ 120,000