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Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
9 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Balance at beginning of period $ 120,000 $ 180,000
Liabilities accrued for warranties issued during the period 141,033 222,520
Warranty claims and costs paid during the period (65,736) (205,629)
Changes in liability for pre-existing warranties during the period (85,297) 3,109
Balance at end of period $ 110,000 $ 200,000