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The following table summarizes stock option information as of June 30, 2023: (Details)
 6 Months Ended
Jun. 30, 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 (15,960)
Weighted average exercise price options forfeited | $ / shares $ 70.48
Options exercised (93,430)
Weighted average exercise price options exercised | $ / shares $ 55.57
Options shares under option - end of year 332,190
Weighted average exercise price shares under option - end of year | $ / shares $ 70.44
Options exercisable 187,020
Weighted average exercise price options exercisable | $ / shares $ 61.53
Options available for future grants 574,935