Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings per share [Abstract]
Net loss	$ 910	$ (867)	$ (3,410)	$ (3,712)
Shares [Abstract]
Basic: Weighted average common shares outstanding (in shares)	9,408	7,548	9,112	7,533
Add: Dilutive effect of outstanding options and restricted stock units as determined by the treasury stock method (in shares)	438	0	0	0
Diluted: Weighted average common and common equivalent shares outstanding (in shares)	9,846	7,548	9,112	7,533
Net (loss) income per common share [Abstract]
Basic (in dollars per share)	$ 0.10	$ (0.11)	$ (0.37)	$ (0.49)
Diluted (in dollars per share)	$ 0.09	$ (0.11)	$ (0.37)	$ (0.49)
Stock Awards [Member]
Earnings per share [Abstract]
Anti-dilutive securities excluded from computation of earnings per dilutive share (in shares)	300	1,400	400	1,400