Income taxes, Unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income taxes [Abstract]
Unrecognized tax benefits that would favorably affect effective income tax rate if recognized	$ 197	$ 142
Unrecognized tax benefits [Roll Forward]
Unrecognized tax benefits, beginning of period	142	144
Tax positions taken during the current period	83	26
Lapse of statute of limitations	(28)	(28)
Unrecognized tax benefits, end of period	197	142
Expected decrease in unrecognized tax benefits in next year	40
Accrued interest and penalties related to uncertain tax positions	$ 25	$ 34