Note 5 - Product Warranties (Tables)

3 Months Ended

Jan. 31, 2019

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended
	January 31,
	2019			2018
Balance at beginning of period	$	180,000		$	180,000
Liabilities accrued for warranties issued during the period		137,576			120,308
Warranty claims and costs paid during the period		(127,838	)		(81,996	)
Changes in liability for pre-existing warranties during the period		(29,738	)		(78,312	)
Balance at end of period	$	160,000		$	140,000