Note 9 - Product Warranty (Tables)

3 Months Ended

Feb. 29, 2020

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	For the Three Months Ended
	February 29, 2020			February 28, 2019
Balance, beginning	$	203,185		$	96,785
Settlements / adjustments		(28,576	)		(132,297	)
Warranties issued		64,624			61,369
Balance, ending	$	239,233		$	25,857