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Transactions and Balances with Related Parties (Schedule of Compensation to Individuals not Employed by Company) (Details) - Non Employed [Member] € in Thousands	12 Months Ended
	Dec. 31, 2019 EUR (€) People	Dec. 31, 2018 EUR (€) People	Dec. 31, 2017 EUR (€) People
Disclosure of transactions between related parties [line items]
Number of people for compensation not employed by the company | People	3	3	3
Number of people for share-based payments | People	3	3	3
Total compensation to directors not employed by the company | €	€ 72	€ 49	€ 35
Share-based payments | €	€ 9	€ 5	€ 14

X

- Definition

Number of people for share-based payments.

+ References

No definition available.

+ Details

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Namespace Prefix:	ello_
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Balance Type:	na
Period Type:	duration

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- Definition

Number of people for compensation not employed by the company.

+ References

No definition available.

+ Details

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Balance Type:	na
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- 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

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- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2019-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_17&doctype=Standard
-URIDate 2019-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2019-01-01
-Paragraph 17
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_17_e&doctype=Standard
-URIDate 2019-03-27

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Period Type:	duration

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- Details

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