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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, 2017 EUR (€) shares | Dec. 31, 2016 EUR (€) shares | Dec. 31, 2015 EUR (€) shares
Number of Options |  |  |
Outstanding at beginning of year | shares | 22,502 | 19,502 | 157,821
Granted | shares | 3,000 | 3,000 | 3,000
Exercised | shares |  |  | (140,193)
Expired | shares |  |  | (1,126)
Outstanding at end of year | shares | 25,502 | 22,502 | 19,502
Exercisable at end of year | shares | 22,502 | 18,502 | 18,502
Weighted Average Exercise Price |  |  |
Outstanding at beginning of year | € | € 7.34 | € 7.19 | € 8.26
Granted | € | 9.02 | 8.3 | 8.96
Exercised | € |  |  | 8.33
Expired | € |  |  | 8.4
Outstanding at end of year | € | 7.54 | 7.34 | 7.19
Exercisable at end of year | € | € 22,502 | € 7.19 | € 7.1

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