Note 9 - Product Warranty (Tables)

3 Months Ended

Feb. 28, 2021

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	For the Three Months Ended
	February 28, 2021			February 29, 2020
Balance, beginning	$	291,454		$	203,185
Settlements / adjustments		33,505			(28,576	)
Warranties issued		(29,378	)		64,624
Balance, ending	$	295,581		$	239,233