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Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
6 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Balance at beginning of period $ 75,000 $ 85,000
Liabilities accrued for warranties issued during the period 80,092 77,122
Warranty claims and costs paid during the period (33,535) (46,271)
Changes in liability for pre-existing warranties during the period (56,557) (20,851)
Balance at end of period $ 65,000 $ 95,000