XML 82 R62.htm IDEA: XBRL DOCUMENT
v3.21.1

Investee Companies and other investments (Schedule of Composition of Advances on Account of Investments) (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of associates [line items] |  |  |
Advances on account of investments | € 1,554 |  |
Total advances on account of investment | 2,423 | 883 |
Manara PSP [Member] |  |  |
Disclosure of associates [line items] |  |  |
Advances on account of investments | 869 | 883 |
Development of PV Projects of Italy [Member] |  |  |
Disclosure of associates [line items] |  |  |
Advances on account of investments | € 1,554 |  |

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

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

X
- 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
Name: | ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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