CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except per share amounts) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net Sales	$ 9,596	$ 6,588	$ 25,955	$ 17,002
Cost of goods sold	3,639	2,945	10,629	7,743
Gross margin	5,957	3,643	15,326	9,259
Operating expenses:
Research and development	1,814	1,358	5,130	3,655
Selling, general and administrative	2,319	1,664	6,300	4,766
Total operating expenses	4,133	3,022	11,430	8,421
Operating income	1,824	621	3,896	838
Non-operating income (expense):
Interest income	6	11	19	34
Gain on sale of assets	72	0	363	0
Foreign currency transaction gain (loss)	(66)	(3)	(158)	41
Total non-operating income	12	8	224	75
Income before income taxes	1,836	629	4,120	913
Income tax (expense)	(108)	(4)	(207)	(12)
Net income	$ 1,728	$ 625	$ 3,913	$ 901
Basic earnings per share	$ 0.21	$ 0.08	$ 0.48	$ 0.11
Diluted earnings per share	$ .20	$ 0.08	$ 0.47	$ 0.11
Weighted-average basic shares	8,201	7,977	8,112	7,955
Weighted-average diluted shares	8,467	8,183	8,400	8,083