CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except per share amounts) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net Sales	$ 34,051	$ 23,413
Cost of goods sold	13,992	10,545
Gross margin	20,059	12,868
Operating expenses:
Research and development	6,896	5,065
Selling, general and administrative	8,116	6,376
Total operating expenses	15,012	11,441
Operating income	5,047	1,427
Non-operating income (expense):
Interest income	29	44
Gain on sale of assets	366	140
Foreign currency transaction gain (loss)	(281)	81
Total non-operating income (expense)	114	265
Income before income taxes	5,161	1,692
Income tax (expense) benefit	288	(36)
Net income	$ 5,449	$ 1,656
Basic earnings per share	$ 0.67	$ 0.21
Diluted earnings per share	$ 0.65	$ 0.20
Weighted-average basic shares	8,149	7,968
Weighted-average diluted shares	8,436	8,132