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Income taxes, Components of income tax benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2017
Current [Abstract]
Federal	$ 26	$ (2,141)
State	51	17
Foreign	2	(48)
Income taxes current	79	(2,172)
Deferred [Abstract]
Federal	(2,086)	(483)
State	(62)	(36)
Foreign	(2)	152
Income taxes deferred	(2,150)	(367)
Income tax benefit	$ (2,071)	$ (2,539)
Effective tax rate	33.30%	31.10%
Federal statutory tax rate	21.00%	21.00%	34.00%
Income taxes [Abstract]
Foreign loss before taxes	$ 404	$ 468
Federal [Member]
Income taxes [Abstract]
Net operating loss carryforward	2,000
State [Member]
Income taxes [Abstract]
Net operating loss carryforward	78
Tax credit carryforward	0
R&D Credit [Member]
Income taxes [Abstract]
Tax credit carryforward	$ 901

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