CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except per share amounts) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net Sales	$ 9,135	$ 5,801	$ 16,359	$ 10,414
Cost of goods sold	3,933	2,713	6,990	4,798
Gross margin	5,202	3,088	9,369	5,616
Operating expenses:
Research and development	1,771	1,172	3,316	2,297
Selling, general and administrative	2,163	1,525	3,981	3,103
Total operating expenses	3,934	2,697	7,297	5,400
Operating income	1,268	391	2,072	216
Non-operating income (expense):
Interest income	6	11	13	23
Gain on sale of assets	80	0	291	0
Foreign currency transaction gain (loss)	(62)	49	(92)	45
Total non-operating income	24	60	212	68
Income before income taxes	1,292	451	2,284	284
Income tax (expense)	(86)	(7)	(99)	(8)
Net income	$ 1,206	$ 444	$ 2,185	$ 276
Basic earnings per share	$ 0.15	$ 0.06	$ 0.27	$ 0.03
Diluted earnings per share	$ 0.14	$ 0.06	$ 0.26	$ 0.03
Weighted-average basic shares	8,104	7,942	8,067	7,944
Weighted-average diluted shares	8,408	8,039	8,367	8,033