Stock Options - Schedule of Qualified Stock Option Activity (Details) - Qualified Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Shares
Options outstanding at beginning of year (in shares)	87,610	100,920	119,720
Granted (in shares)	17,625	18,900	13,950
Exercised (in shares)	(14,780)	(30,210)	(31,300)
Canceled (in shares)	(5,808)	(2,000)	(1,450)
Options outstanding at end of year (in shares)	84,647	87,610	100,920
Exercise Price
Outstanding at beginning of year, exercise price (in dollars per share)	$ 91.24	$ 68.58	$ 57.65
Granted, exercise price (in dollars per share)	137.93	156.38	114.53
Exercised, exercise price (in dollars per share)	50.79	53.68	45.94
Canceled, exercise price (in dollars per share)	114.48	130.92	96.97
Outstanding at end of year, exercise price (in dollars per share)	$ 106.43	$ 91.24	$ 68.58
Options exercisable at end of year (in shares)	43,412	49,360	67,700
Exercisable at end of year, exercise price (in dollars per share)	$ 78.50	$ 61.21	$ 52.60
Options available for grant at end of year (in shares)	286,033	297,850	314,750