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Significant Accounting Policies (Narrative) (Details) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 EUR (€) | Dec. 31, 2015 EUR (€)
Statement Line Items [Line Items] |  |  |
General and administrative expenses |  | € 2,201 | € 1,044
Euro [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Rate of exchange | 0.835 |  |
USD [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Rate of exchange | 1.00 |  |
Bottom of range [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Percentage of hedge | 80.00% |  |
Top of range [member] |  |  |
Statement Line Items [Line Items] |  |  |
Percentage of hedge | 125.00% |  |

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