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The following table summarizes stock option information as of March 31, 2022: (Details)
 3 Months Ended
Mar. 31, 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 (1,180)
Weighted average exercise price options forfeited | $ / shares $ 65.96
Options exercised (13,425)
Weighted average exercise price options exercised | $ / shares $ 52.73
Options shares under option - end of year 510,295
Weighted average exercise price shares under option - end of year | $ / shares $ 57.69
Options exercisable 310,565
Weighted average exercise price Options exercisable | $ / shares $ 52.42
Options available for future grants 613,715