The following table summarizes stock option information as of June 30, 2024: (Details)	9 Months Ended
	Sep. 30, 2024 $ / shares shares
Equity:
Options shares under option - beginning of year	308,970
Weighted average exercise price shares under option - beginning of year | $ / shares	$ 86.52
Options forfeited	(380)
Weighted average exercise price options forfeited | $ / shares	$ 73.09
Options exercised	(24,920)
Weighted average exercise price options exercised | $ / shares	$ 69.39
Options shares under option - end of year	283,670
Weighted average exercise price shares under option - end of year | $ / shares	$ 88.04
Options exercisable	164,950
Weighted average exercise price options exercisable | $ / shares	$ 70.69
Options available for future grants	537,745