Note 5 - Product Warranties (Tables)

3 Months Ended

Jan. 31, 2020

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended
	January 31,
	2020			2019
Balance at beginning of period	$	120,000		$	180,000
Liabilities accrued for warranties issued during the period		69,549			137,576
Warranty claims and costs paid during the period		(12,743	)		(127,838	)
Changes in liability for pre-existing warranties during the period		(106,806	)		(29,738	)
Balance at end of period	$	70,000		$	160,000