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v3.20.1

Trade and Other Receivables and Assets (Narrative) (Details) € in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€)
Statement Line Items [Line Items] |  |  |
Accumulated profit from forward contracts | € | € 531 |  | € 529
USD [Member] |  |  |
Statement Line Items [Line Items] |  |  |
Accumulated profit from forward contracts | $ |  | $ 606 |

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Namespace Prefix: | ello_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |