Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings per share [Abstract]
Net loss	$ (2,206)	$ (992)
Shares [Abstract]
Basic: Weighted average common shares outstanding (in shares)	8,948	7,507
Add: Dilutive effect of outstanding options and restricted stock units as determined by the treasury stock method (in shares)	0	0
Diluted: Weighted average common and common equivalent shares outstanding (in shares)	8,948	7,507
Net (loss) income per common share [Abstract]
Basic (in dollars per share)	$ (0.25)	$ (0.13)
Diluted (in dollars per share)	$ (0.25)	$ (0.13)
Stock Awards [Member]
Earnings per share [Abstract]
Anti-dilutive securities excluded from computation of earnings per dilutive share (in shares)	705	708