Summary of changes in outstanding options (Details) - Share-Based Payment Arrangement, Option [Member] - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Outstanding options, shares	70,560	88,295
Outstanding options, weighted average exercise price	$ 39.09	$ 40.33
Outstanding remaining term	3 years 3 months 19 days	4 years 4 months 24 days
Options outstanding, weighted average fair value	$ 1,081	$ 1,271
Options exercised, shares	(17,735)
Options exercised, weighted avg exercise price	$ 45.27
Options exercised, weighted avg grant date fair value	$ (190)
Options exercisable, shares	66,570
Exercisable, weighted average exercise price	$ 38.68
Exercisable remaining term	3 years 2 months 13 days
Exercisable, weighted average fair value	$ 1,015
Options vested, shares	0
Vested, weighted average fair value	$ 0