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The following table summarizes stock option information as of September 30, 2022: (Details)
 9 Months Ended
Sep. 30, 2022
$ / shares
shares
Equity:  
Options shares under option - beginning of year 524,900
Weighted average exercise price shares under option - beginning of year | $ / shares $ 57.58
Options forfeited (1,480)
Weighted average exercise price options forfeited | $ / shares $ 67.41
Options exercised (45,205)
Weighted average exercise price options exercised | $ / shares $ 40.16
Options shares under option - end of year 478,215
Weighted average exercise price shares under option - end of year | $ / shares $ 59.20
Options exercisable 279,165
Weighted average exercise price options exercisable | $ / shares $ 54.40
Options available for future grants 614,015