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Equity (Narrative) (Details) $ / shares in Units, € in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |
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Aug. 31, 2015 USD ($) shares | Aug. 31, 2015 EUR (€) shares | Mar. 18, 2015 | Aug. 31, 2013 $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 shares | Dec. 31, 2015 shares | Dec. 31, 2017 EUR (€) shares | May 31, 2017 EUR (€) | Jun. 30, 2015 shares | May 31, 2015 EUR (€)
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Number of ordinary shares exercise of employee share options |  |  |  |  | 3,000 | 3,000 | 3,000 |  |  |  |
Maximum dividend paid |  |  | 33.00% |  | 0.00% | 0.00% |  |  |  |  |
Ordinary Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Treasury shares |  |  |  |  | 258,046 | 256,184 | 254,666 | 258,046 |  |  |
Warrant issued to purchase ordinary shares |  |  |  |  |  |  |  |  |  | 15,335 |
Fair value of exercise of employee share options | $ | $ 1,201 |  |  |  |  |  |  |  |  |  |
Number of ordinary shares exercise of employee share options | 140,193 | 140,193 |  |  |  |  |  |  |  |  |
Repurchase of ordinary shares |  |  |  |  | 172,391 |  |  | 172,391 |  |  |
Amount of ordinary shares repurchased | $ |  |  |  |  | $ 1,477 |  |  |  |  |  |
Ordinary Shares [Member] | Euro [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Fair value of exercise of employee share options | € |  | € 1,070 |  |  |  |  |  |  |  |  |
Amount of ordinary shares repurchased | € |  |  |  |  |  |  |  | € 1,332 |  |  |
Ordinary Shares [Member] | Mr. Zohar Zisapel [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Warrant issued to purchase ordinary shares |  |  |  | 308,427 |  |  |  |  |  |  |
Exercise price of warrant | $ / shares |  |  |  | $ 7.97 |  |  |  |  |  |  |
Exercise warrant period |  |  |  | 12 month |  |  |  |  |  |  |
Proportion of ownership interest |  |  |  | 4.99% |  |  |  |  |  |  |
Ordinary Shares [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Amount of ordinary shares repurchased | € |  |  |  |  |  |  |  |  |  |  | € 3,000
Ordinary Shares [Member] | Director [Member] | Euro [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Amount of ordinary shares repurchased | € |  |  |  |  |  |  |  |  | € 2,700 |  |

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