Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Revenues	$ 109,338	$ 97,644	$ 93,668
Costs and expenses:
Cost of sales	62,521	56,899	49,857
Selling, general and administrative	36,375	32,682	33,446
Gain on revaluation of ACT liability	0	0	(758)
Research and development	2,442	2,863	1,474
Costs and Expenses	101,338	92,444	84,019
Operating income	8,000	5,200	9,649
Interest expense	(56)	(93)	(148)
Interest income	58	78	35
Other expense	(137)	(107)	(279)
Income before taxes	7,865	5,078	9,257
Income tax expense	(2,764)	(2,302)	(3,109)
Net income	$ 5,101	$ 2,776	$ 6,148
Net income per common share: (in dollars per share)
Basic	$ 0.23	$ 0.12	$ 0.26
Diluted	$ 0.23	$ 0.12	$ 0.25
Weighted-average number of common shares outstanding:
Basic	22,286,000	22,709,000	24,095,000
Diluted	22,579,000	23,535,000	24,633,000