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The following table summarizes stock option information as of June 30, 2024: (Details)
 6 Months Ended
Jun. 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 (200)
Weighted average exercise price options forfeited | $ / shares $ 73.09
Options exercised (19,620)
Weighted average exercise price options exercised | $ / shares $ 69.81
Options shares under option - end of year 289,150
Weighted average exercise price shares under option - end of year | $ / shares $ 87.66
Options exercisable 170,250
Weighted average exercise price options exercisable | $ / shares $ 70.6
Options granted 537,565