3. Accrued product warranty liability (Tables)

3 Months Ended

Mar. 31, 2016

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

We generally warrant our products for up to 36 months

	Three months ended
	March 31,
	2016		2015
	(In thousands)
Balance, beginning of period	$	277	$	287
Warranties issued		80		40
Warranty settlements		(74)		(71)
Balance, end of period	$	283		256