Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings per share [Abstract]
Net loss	$ (2,114)	$ (1,853)	$ (4,320)	$ (2,845)
Shares [Abstract]
Basic: Weighted average common shares outstanding (in shares)	8,976	7,543	8,962	7,525
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)	8,976	7,543	8,962	7,525
Net (loss) income per common share [Abstract]
Basic (in dollars per share)	$ (0.24)	$ (0.25)	$ (0.48)	$ (0.38)
Diluted (in dollars per share)	$ (0.24)	$ (0.25)	$ (0.48)	$ (0.38)
Stock Awards [Member]
Earnings per share [Abstract]
Anti-dilutive securities excluded from computation of earnings per dilutive share (in shares)	300	1,400	700	1,300