Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues	$ 24,907	$ 24,023	$ 71,030	$ 65,666
Costs and expenses:
Cost of sales	14,671	13,050	39,771	35,069
Selling, general and administrative	8,064	7,701	24,932	23,618
Gain on revaluation of ACT liability				(758)
Research and development	569	358	2,044	1,075
	23,304	21,109	66,747	59,004
Operating income	1,603	2,914	4,283	6,662
Interest expense	(16)	(47)	(90)	(125)
Interest income	16	14	56	19
Other expense	(27)	(57)	(78)	(252)
Income before income taxes	1,576	2,824	4,171	6,304
Income tax expense	(382)	(169)	(1,366)	(1,880)
Net income	$ 1,194	$ 2,655	$ 2,805	$ 4,424
Net income per common share:
Basic (in Dollars per share)	$ 0.05	$ 0.11	$ 0.12	$ 0.18
Diluted (in Dollars per share)	$ 0.05	$ 0.11	$ 0.12	$ 0.18
Weighted-average number of common shares outstanding:
Basic (in Shares)	22,105,000	24,322,000	22,932,000	24,269,000
Diluted (in Shares)	23,022,000	24,850,000	23,749,000	24,881,000