Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Revenues	$ 29,092	$ 20,911	$ 51,576	$ 46,123
Costs and expenses:
Cost of sales	17,227	11,880	30,279	25,100
Selling, general and administrative	9,307	7,874	17,765	16,868
Research and development	430	969	1,363	1,475
Costs and Expenses	26,964	20,723	49,407	43,443
Operating income	2,128	188	2,169	2,680
Interest expense	(10)	(49)	(10)	(74)
Interest income	14	40	29	40
Other expense	(129)	(72)	(209)	(51)
Income before income taxes	2,003	107	1,979	2,595
Income tax expense	(767)	(39)	(764)	(984)
Net income	$ 1,236	$ 68	$ 1,215	$ 1,611
Net income per common share:
Basic (in Dollars per share)	$ 0.06	$ 0.00	$ 0.05	$ 0.07
Diluted (in Dollars per share)	$ 0.05	$ 0.00	$ 0.05	$ 0.07
Weighted-average number of common shares outstanding:
Basic (in Shares)	22,197,000	23,107,000	22,155,000	23,349,000
Diluted (in Shares)	23,295,000	23,984,000	23,133,000	24,122,000