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The following table summarizes stock option activity and related information for the years ended December 31, 2021, 2020 and 2019: (Details) - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Equity:      
Options shares under option - beginning of year 713,210 815,800 776,171
Weighted average exercise price shares under option - beginning of year $ 52.74 $ 49.89 $ 41.33
Options granted 9,000 9,000 194,050
Weighted average exercise price options granted $ 62.18 $ 69.11 $ 72.89
Options exercised (156,490) (95,570) (130,891)
Weighted average exercise price options exercised $ 34.46 $ 28.99 $ 34.06
Options forfeited (40,820) (16,020) (23,530)
Weighted average exercise price options forfeited $ 62.57 $ 58.38 $ 45.48
Options shares under option - end of year 524,900 713,210 815,800
Weighted average exercise price shares under option - end of year $ 57.58 $ 52.74 $ 49.89