Note 8 - Product Warranty (Tables)

9 Months Ended

Aug. 31, 2018

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	For the Three Months Ended
	August 31, 2018			August 31, 2017
Balance, beginning	$	71,216		$	152,964
Settlements / adjustments		(73,108	)		(46,469	)
Warranties issued		73,155			26,699
Balance, ending	$	71,263		$	133,194

	For the Nine Months Ended
	August 31, 2018			August 31, 2017
Balance, beginning	$	68,452		$	134,373
Settlements / adjustments		(214,674	)		(155,603	)
Warranties issued		217,485			154,424
Balance, ending	$	71,263		$	133,194