Note 5 - Product Warranties - Changes in Accrual for Product Warranties (Details) - USD ($)	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Balance at beginning of period	$ 70,000	$ 130,000
Liabilities accrued for warranties issued during the period	71,161	73,968
Warranty claims and costs paid during the period	(32,855)	(52,730)
Changes in liability for pre-existing warranties during the period	(23,306)	(61,238)
Balance at end of period	$ 85,000	$ 90,000