CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except per share amounts) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net Sales	$ 5,801	$ 4,958	$ 10,414	$ 10,860
Cost of goods sold	2,713	2,236	4,798	5,280
Gross margin	3,088	2,722	5,616	5,580
Operating expenses:
Research and development	1,172	1,243	2,297	2,341
Selling, general and administrative	1,525	1,415	3,103	2,953
Total operating expenses	2,697	2,658	5,400	5,294
Operating income	391	64	216	286
Non-operating income (expense):
Interest income	11	27	23	58
Foreign currency transaction gain (loss)	49	7	45	(188)
Total non-operating income (expense)	60	34	68	(130)
Income before income taxes	451	98	284	156
Income tax (expense) benefit	(7)	2	(8)	(7)
Net income	$ 444	$ 100	$ 276	$ 149
Basic earnings per share	$ 0.06	$ 0.01	$ 0.03	$ 0.02
Diluted earnings per share	$ 0.06	$ 0.01	$ 0.03	$ 0.02
Weighted-average basic shares	7,942	7,894	7,944	7,879
Weighted-average diluted shares	8,039	8,078	8,033	8,062