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v3.25.2

Related Party Transactions (Details 1) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | --- | ---
Related Party Transactions |  |  |
Promissory Note | $ 0 | $ 519 | $ 519

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

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