Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)	3 Months Ended
	Jan. 31, 2024	Jan. 31, 2023
Balance at beginning of period	$ 80,000	$ 75,000
Liabilities accrued for warranties issued during the period	42,272	55,430
Warranty claims and costs paid during the period	(10,188)	(26,574)
Changes in liability for pre-existing warranties during the period	(37,084)	(38,856)
Balance at end of period	$ 75,000	$ 65,000