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Investee Companies and other investments (Schedule of Composition of Advances on Account of Investments) (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of associates [line items] |  |  |
Advances on account of investments |  |  | € 8,000
Total advances on account of investment | € 883 | € 798 |
Manara Project [Member] |  |  |
Disclosure of associates [line items] |  |  |
Advances on account of investments | € 883 | € 798 |

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- Definition Total advances on account of investment. + References No definition available. + Details
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Namespace Prefix: | ello_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Advances on account of investments. + References No definition available. + Details
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Namespace Prefix: | ello_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=ello_ManaraProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |