Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Net income	$ 3,024	$ 2,131
Less: Net income allocated to unvested participating securities	56	32
Net income available to common stockholders	$ 2,968	$ 2,099
Denominator:
Denominator for basic earnings per share - weighted average shares	5,751	5,710
Effect of dilutive securities:
Stock options	8	52
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions	5,759	5,762
Basic earnings per share	$ 0.52	$ 0.37
Diluted earnings per share	$ 0.52	$ 0.36