XML 117 R65.htm IDEA: XBRL DOCUMENT v3.25.2

Share capital (Details 3) - Warrant continuity schedule [Member] - USD ($)	3 Months Ended			12 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024
Statement [Line Items]
Balance at beginning (in shares)	912,841	912,841	912,841	912,841
Beginning balance, amount	$ 113	$ 138	$ 155	$ 1,489
Fair value adjustment	$ 138	$ (25)	$ (17)	$ (1,334)
Balance at ending (in shares)	912,841	912,841	912,841	912,841
Ending balance, amount	$ 251	$ 113	$ 138	$ 155

X

- Definition

The element represents fair value adjustment.

+ References

No definition available.

+ Details

Name:	elva_FairValueAdjustment
Namespace Prefix:	elva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	elva_StatementLineItems
Namespace Prefix:	elva_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	elva_WarrantContinityAmount
Namespace Prefix:	elva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	elva_WarrantContinuityAmount
Namespace Prefix:	elva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 79
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_79_a_iv&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_NumberOfSharesOutstanding
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=elva_WarrantContinuityScheduleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: