Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Sales	$ 70,186	$ 82,356	$ 138,007	$ 151,484
Cost of sales	46,633	55,394	91,711	102,667
Gross profit	23,553	26,962	46,296	48,817
Selling, general and administrative expenses	19,637	21,071	40,230	40,671
Research & development	3,369	3,498	6,656	7,105
Restructuring	226	0	426	0
Other expense (income), net	20	10	(72)	75
Income (loss) from operations	301	2,383	(944)	966
Interest expense	132	154	285	311
Interest income	(69)	(23)	(136)	(40)
Income (loss) before income taxes	238	2,252	(1,093)	695
Income tax expense	93	666	8	517
Net Income (loss)	$ 145	$ 1,586	$ (1,101)	$ 178
Per share data:
Basic earnings (loss) per share:	$ 0.01	$ 0.12	$ (0.09)	$ 0.01
Diluted earnings (loss) per share:	0.01	0.12	(0.09)	0.01
Cash dividends declared per share:	$ 0.02	$ 0.02	$ 0.04	$ 0.04