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
Basic income per share
Net income	$ 520	$ 748	$ 790	$ 2,317
Basic income (loss) per share (in dollars per share)			$ 0.16	$ 0.46
Weighted average shares outstanding (in shares)	5,080	5,054	5,078	5,036
Diluted income per share
Dilutive effect of stock options (in shares)	19	45	20	39
Total weighted average shares outstanding (in shares)	5,099	5,099	5,098	5,075
Diluted income (loss) per share (in dollars per share)	$ 0.10	$ 0.15	$ 0.15	$ 0.46