3. Accrued product warranty liability (Tables)

6 Months Ended

Jun. 30, 2016

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

We generally warrant our products for up to 36 months

	Six months ended
	June 30,
	2016		2015
	(In thousands)
Balance, beginning of period	$	277	$	287
Warranties issued		131		125
Warranty settlements		(136)		(149)
Balance, end of period	$	272		263