CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except per share amounts) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net Sales	$ 23,413	$ 22,017
Cost of goods sold	10,545	10,473
Gross margin	12,868	11,544
Operating expenses:
Research and development	5,065	4,701
Selling, general and administrative	6,376	5,850
Total operating expenses	11,441	10,551
Operating income	1,427	993
Non-operating income (expense):
Interest income	44	105
Gain on sale of assets	140	0
Foreign currency transaction gain (loss)	81	(176)
Total non-operating income (expense)	265	(71)
Income before income taxes	1,692	922
Income tax (expense) benefit	(36)	5
Net income	$ 1,656	$ 927
Basic earnings per share	$ 0.21	$ 0.12
Diluted earnings per share	$ 0.20	$ 0.12
Weighted-average basic shares	7,968	7,907
Weighted-average diluted shares	8,132	8,054