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The following table summarizes stock option information as of June 30, 2021: (Details)
 6 Months Ended
Jun. 30, 2021
$ / shares
shares
Equity:  
Options shares under option - beginning of year 713,210
Weighted average exercise price shares under option - beginning of year (in Dollars per share) | $ / shares $ 52.74
Options granted 9,000
Weighted average exercise price options granted (in Dollars per share) | $ / shares $ 62.18
Options forfeited (33,240)
Weighted average exercise price options forfeited (in Dollars per share) | $ / shares $ 62.15
Options exercised (45,550)
Weighted average exercise price options exercised (in Dollars per share) | $ / shares $ 34.75
Options shares under option - end of year 643,420
Weighted average exercise price shares under option - end of year (in Dollars per share) | $ / shares $ 53.66
Options exercisable 313,360
Weighted average exercise price options exercisable (in Dollars per share) | $ / shares $ 44.64
Options available for future grants 604,955