Income taxes (Details) - USD ($)	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Income taxes
Income tax expense (benefit)	$ 670,000	$ 585,000
Effective income tax rate	21.90%	27.10%

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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+ Details