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