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Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
6 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Balance at beginning of period $ 120,000 $ 180,000
Liabilities accrued for warranties issued during the period 92,769 153,981
Warranty claims and costs paid during the period (46,389) (176,554)
Changes in liability for pre-existing warranties during the period (81,380) 2,573
Balance at end of period $ 85,000 $ 160,000