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Income taxes, Components of income tax benefit (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Current [Abstract]      
Federal   $ 149 $ 26
State   110 51
Foreign   (83) 2
Income taxes current   176 79
Deferred [Abstract]      
Federal   (1,924) (2,057)
State   (217) (62)
Foreign   0 (2)
Income taxes deferred   (2,141) (2,121)
Income tax benefit $ (413) $ (1,965) $ (2,042)
Effective tax rate   24.90% 33.60%
Federal statutory tax rate   21.00% 21.00%
Income taxes [Abstract]      
Foreign income (loss) before taxes   $ 24 $ (404)
Federal [Member]      
Income taxes [Abstract]      
Net operating loss carryforwards not subject to expiration   10,900  
State [Member]      
Income taxes [Abstract]      
Net operating loss carryforwards subject to expiration   200  
Tax credit carryforwards subject to expiration   0  
R&D Credit [Member]      
Income taxes [Abstract]      
Tax credit carryforwards subject to expiration   $ 1,200  
Life of tax credit carry forward   20 years