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Basic and diluted earnings per common share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings per common share:        
Weighted average common shares outstanding   during the period – shares used for basic   earnings per common share 9,384 9,353 9,375 9,347
Common shares issuable under share based payment plans which are potentially dilutive 40 37 41 38
Common shares used for diluted earnings per common share 9,424 9,390 9,416 9,385
Net income attributable to the Company $ 657 $ 82 $ 1,329 $ 28,455
 -basic $ 0.07 $ 0.01 $ 0.14 $ 3.04
 -diluted $ 0.07 $ 0.01 $ 0.14 $ 3.03