Income taxes, Valuation allowance on deferred tax assets (Details) - Foreign Net Operating Loss Carryforwards [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Valuation allowance [Roll Forward]
Balance, beginning of period	$ 656	$ 733
Subtractions released to income tax provisions	0	(77)
Additions charged to income tax provision	63	0
Balance, end of period	$ 719	$ 656