Income per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Per Share
Net Income	$ 9,348	$ 8,925	$ 17,847	$ 16,651
Weighted Average Basic Shares Outstanding	1,794	1,826	1,796	1,826
Add: Effect Of Dilutive Securities	4	2	4	4
Weighted Average Diluted Shares Outstanding	1,798	1,828	1,800	1,830
Earnings Per Share:
Basic	$ 5.21	$ 4.89	$ 9.94	$ 9.12
Diluted	$ 5.20	$ 4.88	$ 9.91	$ 9.10