Summary of Significant Accounting Policies (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
Numerator:
Income from continuing operations, net of income tax	$ 5,199	$ 3,283	$ 7,902	$ 5,031
Loss from discontinued operations, net of income tax	(67)	(113)	(65)	(199)
Net income	$ 5,132	$ 3,170	$ 7,837	$ 4,832
Denominator:
Denominator for basic earnings per share - weighted average shares	4,246	4,242	4,243	4,237
Effect of dilutive securities	1	3	7	5
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions	4,247	4,245	4,250	4,242
Basic earning (loss) per share :
From continuing operations	$ 1.22	$ 0.77	$ 1.86	$ 1.19
From discontinued operations	$ (0.01)	$ (0.02)	$ (0.01)	$ (0.05)
Earnings per share	$ 1.21	$ 0.75	$ 1.85	$ 1.14
Diluted earnings (loss) per share:
From continuing operations	$ 1.22	$ 0.77	$ 1.86	$ 1.19
From discontinued operations	$ (0.01)	$ (0.02)	$ (0.02)	$ (0.05)
Earnings per share	$ 1.21	$ 0.75	$ 1.84	$ 1.14