XML 114 R62.htm IDEA: XBRL DOCUMENT
v3.25.2

Share capital (Details) - Common Shares [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2024 | Jun. 30, 2025 | Sep. 30, 2024
Statement [Line Items] |  |  |
Balance, beginning | $ 116,408 | $ 127,990 | $ 115,041
Balance at beginning (in shares) | 34,137,665 | 40,088,915 | 33,832,784
Issuance of shares | $ 11,582 |  | $ 30
Issuance of shares (in shares) | 5,951,250 |  | 10,024
Exercise of options |  | $ 72 | $ 667
Excercise of options (in shares) |  | 18,000 | 252,700
Transfer from contributed surplus |  |  | $ 501
Issuance of shares note |  |  | $ 169
Issuance of share note (in shares) |  |  | 42,157
Balance, ending | $ 127,990 | $ 128,062 | $ 116,408
Balance at ending (in shares) | 40,088,915 | 40,106,915 | 34,137,665

X
- Definition The element represents exercise of options one amount. + References No definition available. + Details
Name: | elva_ExerciseOfOptionsOneAmount
Namespace Prefix: | elva_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The element represents exercise of options one share. + References No definition available. + Details
Name: | elva_ExerciseOfOptionsOneShare
Namespace Prefix: | elva_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The element represents issuance of shares one amount. + References No definition available. + Details
Name: | elva_IssuanceOfSharesOneAmount
Namespace Prefix: | elva_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The element represents issuance of shares one share. + References No definition available. + Details
Name: | elva_IssuanceOfSharesOneShare
Namespace Prefix: | elva_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents issuance of shares three amount. + References No definition available. + Details
Name: | elva_IssuanceOfSharesThreeAmount
Namespace Prefix: | elva_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The element represents issuance of shares three share. + References No definition available. + Details
Name: | elva_IssuanceOfSharesThreeShare
Namespace Prefix: | elva_
Data Type: | xbrli:sharesItemType
Balance Type: | na
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
- Definition The element represents transfer from contributed surplus one. + References No definition available. + Details
Name: | elva_TransferFromContributedSurplusOne
Namespace Prefix: | elva_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares authorised. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 79 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_79_a_i&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_NumberOfSharesAuthorised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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