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Lease liability (Details 1) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2024	Sep. 30, 2025
Lease liability
Interest on lease liabilities	$ 349	$ 214
Incremental borrowing rate at time of transition	14.00%	14.00%
Cash outflow for the lease	$ 735	$ 545

X

- References

No definition available.

+ Details

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Namespace Prefix:	elva_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	elva_DisclosureLeaseLiabilityAbstract
Namespace Prefix:	elva_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

The cash outflow for leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph g
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_g&doctype=Standard
-URIDate 2024-03-27

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X

- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_b&doctype=Standard
-URIDate 2024-03-27

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