Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator:
Net income	$ 2,439	$ 2,949
Less: Net income allocated to unvested participating securities	21	0
Net income available to common stockholders	$ 2,418	$ 2,949
Denominator:
Denominator for basic earnings per share— weighted average shares	5,690	5,673
Effect of dilutive securities:
Stock options	67	65
Denominator for diluted earnings per share — adjusted weighted-average shares and assumed conversions	5,757	5,738
Basic earnings per share	$ 0.43	$ 0.52
Diluted earnings per share	$ 0.42	$ 0.51