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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

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- 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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No definition available.

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