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

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- 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

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- References No definition available. + Details
Name: | elva_StatementLineItems
Namespace Prefix: | elva_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | elva_WarrantContinityAmount
Namespace Prefix: | elva_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | elva_WarrantContinuityAmount
Namespace Prefix: | elva_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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