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Earnings per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings per share [Abstract]        
Net income (loss) $ 765 $ (2,376) $ 3,904 $ (6,724)
Shares [Abstract]        
Basic: Weighted average common shares outstanding (in shares) 9,956 9,910 9,943 9,898
Add: Dilutive effect of outstanding options and restricted stock units as determined by the treasury stock method (in shares) 61 0 73 0
Diluted: Weighted average common and common equivalent shares outstanding (in shares) 10,017 9,910 10,016 9,898
Net income (loss) per common share [Abstract]        
Basic (in dollars per share) $ 0.08 $ (0.24) $ 0.39 $ (0.68)
Diluted (in dollars per share) $ 0.08 $ (0.24) $ 0.39 $ (0.68)
Stock Awards [Member]        
Earnings per share [Abstract]        
Anti-dilutive securities excluded from computation of earnings per dilutive share (in shares)   1,500   1,200