Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)	6 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Balance at beginning of period	$ 75,000	$ 75,000
Liabilities accrued for warranties issued during the period	59,149	80,092
Warranty claims and costs paid during the period	(39,652)	(33,535)
Changes in liability for pre-existing warranties during the period	(29,497)	(56,557)
Balance at end of period	$ 65,000	$ 65,000