Note 6 - Warranty and Service Contracts (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Beginning Balance	$	3,561	$	2,877	$	3,508	$	2,461
Add: Accruals for warranties issued during the period		1,589		959		6,164		5,038
Less: Warranty related expenses during the period		(1,510)		(896)		(6,032)		(4,559)
Ending Balance	$	3,640	$	2,940	$	3,640	$	2,940