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Restricted Cash, Deposits and Marketable Securities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2021
Disclosure Of Restricted Cash Deposits And Marketable Securities [Abstract]
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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- References

No definition available.

+ Details

Name:	ello_DisclosureOfRestrictedCashDepositsAndMarketableSecuritiesAbstract
Namespace Prefix:	ello_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration