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The following table summarizes stock option information as of March 31, 2024: (Details)
 3 Months Ended
Mar. 31, 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 (140)
Weighted average exercise price options forfeited | $ / shares $ 73.09
Options exercised (18,980)
Weighted average exercise price options exercised | $ / shares $ 69.87
Options shares under option - end of year 289,850
Weighted average exercise price shares under option - end of year | $ / shares $ 87.62
Options exercisable 170,890
Weighted average exercise price options exercisable | $ / shares $ 70.60
Options granted 537,505