Stock Options - Schedule of Qualified Stock Option Activity (Details) - Qualified Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Shares
Options outstanding at beginning of year (in shares)	84,647	87,610	100,920
Granted (in shares)	14,425	17,625	18,900
Exercised (in shares)	(21,260)	(14,780)	(30,210)
Canceled (in shares)	(1,950)	(5,808)	(2,000)
Options outstanding at end of year (in shares)	75,862	84,647	87,610
Exercise Price
Outstanding at beginning of year, exercise price (in dollars per share)	$ 106.43	$ 91.24	$ 68.58
Granted, exercise price (in dollars per share)	178.25	137.93	156.38
Exercised, exercise price (in dollars per share)	72.09	50.79	53.68
Canceled, exercise price (in dollars per share)	148.08	114.48	130.92
Outstanding at end of year, exercise price (in dollars per share)	$ 128.64	$ 106.43	$ 91.24
Options exercisable at end of year (in shares)	34,027	43,412	49,360
Exercisable at end of year, exercise price (in dollars per share)	$ 100.00	$ 78.50	$ 61.21
Options available for grant at end of year (in shares)	273,558	286,033	297,850