Income per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income per share (Details)
Net income	$ 2,792	$ 3,485
Weighted average basic shares outstanding	1,760	1,762
Add: Effect of dilutive securities	1	1
Weighted average diluted shares outstanding	1,761	1,763
Basic	$ 1.59	$ 1.98
Diluted	$ 1.59	$ 1.98