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Financial Instruments (Narrative) (Details) - EUR (€) € in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | [1] | Dec. 31, 2014 | [1]
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Disclosure of detailed information about financial instruments [abstract] |  |  |  |  |  |
Cash and cash equivalents | € 23,962 |  | € 22,486 | [1] | € 17,194 | € 12,972
Marketable Securities | 5,412 |  | 972 |  |  |
Short-term restricted cash | 3,265 | [2] | 15 | [1],[2] | 73 |
Non-current restricted cash | 3,660 |  | 5,134 | [1] | € 4,886 |
Trade receivables | 407 |  | 329 |  |  |
Revenue receivables | 3,436 |  | 2,753 |  |  |
Government authorities receivables | € 2,306 |  | € 2,213 |  |  |
[1] | Please refer to note 2C for functional and presentation currency.
[2] | Current accounts and bank deposits securing short term obligations.

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