Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Weighted average common shares outstanding during the period - shares used for basic earnings per common share	9,952	10,015
Common shares issuable under share based payment plans which are potentially dilutive	44	70
Common shares used for diluted earnings per common share	9,996	10,085
Income (loss) from continuing operations	$ 1,641	$ (693)
Discontinued operations	86	1,722
Net income attributable to the Company	$ 1,898	$ 1,560
Basic earnings per common share:
Income (loss) from continuing operations	$ 0.16	$ (0.07)
Discontinued operations	0.01	0.17
Net income	0.19	0.16
Diluted earnings per common share
Income (loss) from continuing operations	0.16	(0.07)
Discontinued operations	0.01	0.17
Net income	$ 0.19	$ 0.15