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Share-Based Payment (Schedule of Number and Weighted Average Exercise Prices of Share Options) (Details)
 12 Months Ended
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Number of Options      
Outstanding at beginning of year | shares 34,886 27,169 25,502
Granted | shares 4,249 18,303 3,000
Exercised | shares (8,000) (3,586)
Expired | shares (7,000) (1,333)
Outstanding at end of year | shares 31,135 34,886 27,169
Exercisable at end of year | shares 17,018 16,583 24,169
Weighted Average Exercise Price      
Outstanding at beginning of year | $ / shares $ 9.83 $ 7.82 $ 7.54
Granted | $ / shares 28.91 11.41 8.95
Exercised | $ / shares 7.87 6.27
Expired | $ / shares 8.25 5
Outstanding at end of year | $ / shares 12.94 9.83 7.82
Exercisable at end of year | $ / shares $ 6.3 $ 8.09 $ 7.68