Note 5 - Product Warranties (Tables)

6 Months Ended

Apr. 30, 2021

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	Six Months Ended
	April 30,
	2021			2020
Balance at beginning of period	$	85,000		$	120,000
Liabilities accrued for warranties issued during the period		77,122			92,769
Warranty claims and costs paid during the period		(46,271	)		(46,389	)
Changes in liability for pre-existing warranties during the period		(20,851	)		(81,380	)
Balance at end of period	$	95,000		$	85,000