CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except per share amounts) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net Sales	$ 7,629	$ 7,224
Cost of goods sold	3,213	3,057
Gross margin	4,416	4,167
Operating expenses:
Research and development	1,879	1,545
Selling, general and administrative	2,193	1,818
Total operating expenses	4,072	3,363
Operating income	344	804
Non-operating income (expense):
Interest income	7	8
Gain on sale of assets	0	211
Foreign currency transaction gain (loss)	(176)	(32)
Total non-operating income	(169)	187
Income before income taxes	175	991
Income tax (expense)	(45)	(12)
Net income	$ 130	$ 979
Basic earnings per share	$ 0.02	$ 0.12
Diluted earnings per share	$ 0.02	$ 0.12
Weighted-average basic shares	8,287	8,031
Weighted-average diluted shares	8,542	8,327