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Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
9 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Balance at beginning of period $ 85,000 $ 120,000
Liabilities accrued for warranties issued during the period 86,287 141,033
Warranty claims and costs paid during the period (50,714) (65,736)
Changes in liability for pre-existing warranties during the period (25,573) (85,297)
Balance at end of period $ 95,000 $ 110,000