Note 5 - Warranty (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Beginning Balance	$	2,877		$	2,000		$	2,461		$	1,819
Add: Accruals for warranties issued during the period		959			1,202			5,038			3,634
Less: Warranty related expenses during the period		(896	)		(1,102	)		(4,559	)		(3,353	)
Ending Balance	$	2,940		$	2,100		$	2,940		$	2,100