Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basic and diluted net income per share
Income from continuing operations, net of income taxes	$ 4,282	$ 3,542	$ 2,418	$ 1,823
Income from discontinued operations, net of income taxes		74		66
Net Income	$ 4,282	$ 3,616	$ 2,418	$ 1,889
Weighted average shares outstanding	8,874	8,834	8,860	8,822
Weighted effect of dilutive options and rights	54	61	76	70
Weighted average shares outstanding assuming dilution	8,928	8,895	8,936	8,892
Net income per share:
From continuing operations	$ 0.48	$ 0.40	$ 0.27	$ 0.21
From discontinued operations		$ 0.01		$ 0.01
Net income per share	$ 0.48	$ 0.41	$ 0.27	$ 0.21
Net income per share assuming dilution: [Member]
Net income per share:
From continuing operations	$ 0.48	$ 0.40	$ 0.27	$ 0.21
From discontinued operations		$ 0.01		$ 0.01
Net income per share	$ 0.48	$ 0.41	$ 0.27	$ 0.21