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The following table summarizes stock option information as of September 30, 2023: (Details)
 9 Months Ended
Sep. 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 (20,025)
Weighted average exercise price options forfeited | $ / shares $ 72.22
Options exercised (98,565)
Weighted average exercise price options exercised | $ / shares $ 56.03
Options shares under option - end of year 322,990
Weighted average exercise price shares under option - end of year | $ / shares $ 70.43
Options exercisable 181,885
Weighted average exercise price options exercisable | $ / shares $ 61.44
Options available for future grants 579,000