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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
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Dec. 31, 2024 | Dec. 31, 2023
Development of PV Projects in Italy [Member] |  |
Investee Companies and Other Investments - Schedule of Composition of Advances on Account of Investments (Details) [Line Items] |  |
On account of development of PV projects in Italy | € 547 | € 898

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- Definition The amount of on account of development of PV projects in Italy. + References No definition available. + Details
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Namespace Prefix: | ello_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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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: |