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Computation of Earnings per Share - Summary of net income per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 1,277	$ 1,145	$ 594	$ 1,560
Shares outstanding:
Weighted-average common shares outstanding (in shares)	21,564	21,679	21,548	21,900
Additional dilutive common stock equivalents (in shares)	75	79	56	67
Diluted shares outstanding (in shares)	21,639	21,758	21,604	21,967
Net income per share - basic (in dollars per share)	$ 0.06	$ 0.05	$ 0.03	$ 0.07
Net income per share - diluted (in dollars per share)	$ 0.06	$ 0.05	$ 0.03	$ 0.07

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