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The following table summarizes stock option activity and related information for the years ended December 31, 2022, 2021 and 2020: (Details) - $ / shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Equity:      
Options shares under option - beginning of year 524,900 713,210 815,800
Weighted average exercise price shares under option - beginning of year $ 57.58 $ 52.74 $ 49.89
Options granted 62,000 9,000 9,000
Weighted average exercise price options granted $ 97.84 $ 62.18 $ 69.11
Options exercised (136,880) (156,490) (95,570)
Weighted average exercise price options exercised $ 43.86 $ 34.46 $ 28.99
Options forfeited (8,440) (40,820) (16,020)
Weighted average exercise price options forfeited $ 67.65 $ 62.57 $ 58.38
Options shares under option - end of year 441,580 524,900 713,210
Weighted average exercise price shares under option - end of year $ 67.30 $ 57.58 $ 52.74