Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator:
Net income	$ 3,112	$ 3,245	$ 9,717	$ 10,461
Less: Net income allocated to unvested participating securities	46	28	144	91
Net income available to common stockholders	$ 3,066	$ 3,217	$ 9,573	$ 10,370
Denominator:
Denominator for basic earnings per share— weighted average shares	5,724	5,699	5,708	5,696
Effect of dilutive securities:
Common stock equivalents	28	43	41	55
Denominator for diluted earnings per share — adjusted weighted average shares and assumed conversions	5,752	5,742	5,749	5,751
Basic earnings per share:	$ 0.54	$ 0.56	$ 1.68	$ 1.82
Diluted earnings per share:	$ 0.53	$ 0.56	$ 1.67	$ 1.8