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Share-Based Payment (Schedule of Number and Weighted Average Exercise Prices of Share Options) (Details)
 12 Months Ended
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Dec. 31, 2017
shares
$ / shares
Number of Options      
Outstanding at beginning of year | shares 27,169 25,502 22,502
Granted | shares 18,303 3,000 3,000
Exercised | shares (3,586)
Expired | shares (7,000) (1,333)
Outstanding at end of year | shares 34,886 27,169 25,502
Exercisable at end of year | shares 16,583 24,169 22,502
Weighted Average Exercise Price      
Outstanding at beginning of year | $ / shares $ 7.82 $ 7.54 $ 7.34
Granted | $ / shares 11.41 8.95 9.02
Exercised | $ / shares 6.27
Expired | $ / shares 8.25 5
Outstanding at end of year | $ / shares 9.83 7.82 7.54
Exercisable at end of year | $ / shares $ 8.09 $ 7.68 $ 7.34