CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Income Statement [Abstract]
Net Sales	$ 26,666	$ 26,396
Cost of goods sold	11,431	11,052
Gross margin	15,235	15,344
Operating expenses:
Research and development	5,470	4,159
Selling, general and administrative	8,304	7,685
Total operating expenses	13,774	11,844
Gain on sale of assets	0	13
Operating income	1,461	3,513
Non-operating income (expense):
Interest income	97	52
Interest expense	(14)	(11)
Foreign currency transaction gain (loss)	(248)	(268)
Total non-operating income (loss)	(165)	(227)
Income before income taxes	1,296	3,286
Income tax (expense) benefit	(233)	(274)
Net income	$ 1,063	$ 3,012
Basic earnings per share	$ 0.12	$ 0.33
Diluted earnings per share	$ 0.11	$ 0.33
Weighted-average basic shares	9,181	8,997
Weighted-average diluted shares	9,320	9,122