Note 9 - Product Warranty (Tables)

9 Months Ended

Aug. 31, 2020

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	For the Three Months Ended
	August 31, 2020			August 31, 2019
Balance, beginning	$	268,233		$	89,637
Settlements / adjustments		(47,591	)		(42,691	)
Warranties issued		57,876			93,889
Balance, ending	$	278,518		$	140,835

	For the Nine Months Ended
	August 31, 2020			August 31, 2019
Balance, beginning	$	203,185		$	96,786
Settlements / adjustments		(113,313	)		(237,629	)
Warranties issued		188,646			281,678
Balance, ending	$	278,518		$	140,835