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Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)
9 Months Ended
Jul. 31, 2025
Jul. 31, 2024
Balance at beginning of period $ 65,000 $ 80,000
Liabilities accrued for warranties issued during the period 109,520 84,792
Warranty claims and costs paid during the period (45,029) (65,994)
Changes in liability for pre-existing warranties during the period (24,491) (23,798)
Balance at end of period $ 105,000 $ 75,000