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The following table summarizes stock option information as of March 31, 2023: (Details)
 3 Months Ended
Mar. 31, 2023
$ / shares
shares
Equity:  
Options shares under option - beginning of year 441,580
Weighted average exercise price shares under option - beginning of year | $ / shares $ 67.30
Options forfeited (15,480)
Weighted average exercise price options forfeited | $ / shares $ 70.48
Options exercised (88,710)
Weighted average exercise price options exercised | $ / shares $ 55.57
Options shares under option - end of year 337,390
Weighted average exercise price shares under option - end of year | $ / shares $ 70.24
Options exercisable 191,740
Weighted average exercise price options exercisable | $ / shares $ 61.38
Options available for future grants 574,455