Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Earnings per share [Abstract]
Net loss	$ 260	$ 528	$ (2,376)	$ (4,348)	$ (823)	$ 901	$ (2,030)	$ (2,089)	$ (5,936)	$ (4,041)
Shares [Abstract]
Basic: Weighted average common shares outstanding (in shares)					9,848				9,905	9,298
Add: Dilutive effect of outstanding equity awards as determined by the treasury stock method (in shares)									0	0
Diluted: Weighted average common and common equivalent shares outstanding (in shares)					9,848				9,905	9,298
Net loss per common share [Abstract]
Basic (in dollars per share)	$ 0.03	$ 0.05	$ (0.24)	$ (0.44)	$ (0.08)	$ 0.1	$ (0.23)	$ (0.23)	$ (0.6)	$ (0.43)
Diluted (in dollars per share)	$ 0.03	$ 0.05	$ (0.24)	$ (0.44)	$ (0.08)	$ 0.09	$ (0.23)	$ (0.23)	$ (0.6)	$ (0.43)
Stock Awards [Member]
Earnings per share [Abstract]
Anti-dilutive securities excluded from computation of earnings per dilutive share (in shares)									1,463,000	391,000