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Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
9 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Balance at beginning of period $ 75,000 $ 85,000
Liabilities accrued for warranties issued during the period 98,392 86,287
Warranty claims and costs paid during the period (47,606) (50,714)
Changes in liability for pre-existing warranties during the period (50,786) (25,573)
Balance at end of period $ 75,000 $ 95,000