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Restricted Cash, Deposits and Marketable Securities (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2021
Disclosure of financial assets [line items] |
Bonds coupon rate | 3.255%

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- Definition Bonds coupon rate. + References No definition available. + Details
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Namespace Prefix: | ello_
Data Type: | dtr-types:percentItemType
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
Name: | ifrs-full_DisclosureOfFinancialAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration