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Share-Based Payment (Schedule of Number and Weighted Average Exercise Prices of Share Options) (Details) | 12 Months Ended
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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

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