Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Revenues	$ 33,555	$ 24,907	$ 85,131	$ 71,030
Costs and expenses:
Cost of sales	18,455	14,671	48,734	39,771
Selling, general and administrative	9,304	8,064	27,069	24,932
Research and development	461	569	1,824	2,044
Costs and Expenses	28,220	23,304	77,627	66,747
Operating income	5,335	1,603	7,504	4,283
Interest expense	(19)	(16)	(29)	(90)
Interest income	14	16	43	56
Other expense	(82)	(27)	(291)	(78)
Income before income taxes	5,248	1,576	7,227	4,171
Income tax expense	(1,768)	(382)	(2,532)	(1,366)
Net income	$ 3,480	$ 1,194	$ 4,695	$ 2,805
Net income per common share:
Basic (in Dollars per share)	$ 0.16	$ 0.05	$ 0.21	$ 0.12
Diluted (in Dollars per share)	$ 0.15	$ 0.05	$ 0.21	$ 0.12
Weighted-average number of common shares outstanding:
Basic (in Shares)	22,376,000	22,105,000	22,229,000	22,932,000
Diluted (in Shares)	22,534,000	23,022,000	22,458,000	23,749,000