Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings per share [Abstract]
Net loss	$ (2,376)	$ (4,348)	$ (2,030)	$ (6,724)	$ (4,119)
Shares [Abstract]
Basic: Weighted average common shares outstanding (in shares)	9,910	9,886	8,976	9,898	8,962
Add: Dilutive effect of outstanding options and restricted stock units as determined by the treasury stock method (in shares)	0		0	0	0
Diluted: Weighted average common and common equivalent shares outstanding (in shares)	9,910	9,886	8,976	9,898	8,962
Net loss per common share [Abstract]
Basic (in dollars per share)	$ (0.24)	$ (0.44)	$ (0.23)	$ (0.68)	$ (0.46)
Diluted (in dollars per share)	$ (0.24)	$ (0.44)	$ (0.23)	$ (0.68)	$ (0.46)
Stock Awards [Member]
Earnings per share [Abstract]
Anti-dilutive securities excluded from computation of earnings per dilutive share (in shares)	1,500		300	1,200	700