Basic and diluted earnings per common share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings per common share (1):
Weighted average common shares outstanding during the period – shares used for basic  earnings per common share	18,859	18,832
Common shares issuable under share-based  payment plans which are potentially dilutive	85	80
Common shares used for diluted  earnings per common share	18,944	18,912
Net income attributable to the Company	$ 1,301	$ 565
-basic	$ 0.07	$ 0.03
-diluted	$ 0.07	$ 0.03