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Significant Accounting Policies (Schedule of Estimated Useful Lives) (Details) | 12 Months Ended
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Dec. 31, 2021
Italian Subsidiaries [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful life (Years) | 20 years
Spanish subsidiaries [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful life (Years) | 20-25 years
Office furniture and equipment [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Depreciation percentage on straight-line basis over the useful life of the assets (in %) | 6-33
Mainly % | 33
Photovoltaic plants in Spain [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Depreciation percentage on straight-line basis over the useful life of the assets (in %) | 4-5
Mainly % | 4-5
Photovoltaic plants in Italy [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Depreciation percentage on straight-line basis over the useful life of the assets (in %) | 5
Mainly % | 5
Anaerobic digestion plants in the Netherlands [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Depreciation percentage on straight-line basis over the useful life of the assets (in %) | 8
Mainly % | 8
Leasehold Improvements [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Depreciation percentage on straight-line basis over the useful life of the assets (in %) | Over the shorter of the lease period or the life of the asset
Mainly % | 7
Anaerobic digestion plants [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated useful life (Years) | 12 years

X
- Definition Estimated useful life years. + References No definition available. + Details
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Period Type: | duration

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- Definition The main useful lives or depreciation rates used for property, plant and equipment. + 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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- Definition Description of useful life used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_c&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | na
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 members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ello_SpanishSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ello_PhotovoltaicPlantsInSpainMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ello_AnaerobicDigestionPlantsNetherlandsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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