Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues	$ 97,644	$ 93,668	$ 81,795
Costs and expenses:
Cost of sales	56,899	49,857	46,821
Selling, general and administrative	32,682	33,446	30,857
Gain on revaluation of ACT liability		(758)	(768)
Research and development	2,863	1,474	948
	92,444	84,019	77,858
Operating income	5,200	9,649	3,937
Interest expense	(93)	(148)	(143)
Interest income	78	35	11
Other expense	(107)	(279)	(119)
Income before taxes	5,078	9,257	3,686
Income tax expense	(2,302)	(3,109)	(1,933)
Net income	$ 2,776	$ 6,148	$ 1,753
Net income per common share:
Basic (in Dollars per share)	$ 0.12	$ 0.26	$ 0.07
Diluted (in Dollars per share)	$ 0.12	$ 0.25	$ 0.07
Weighted-average number of common shares outstanding:
Basic (in Shares)	22,709,000	24,095,000	24,213,000
Diluted (in Shares)	23,535,000	24,633,000	24,405,000