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Prepaid expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Prepaid expenses
Prepaid expenses	$ 1,671	$ 612
Prepaid insurance	5	54
Prepaid purchases	8,122	6,981
Total	$ 9,798	$ 7,647

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- References

No definition available.

+ Details

Name:	elva_DisclosurePrepaidExpensesAbstract
Namespace Prefix:	elva_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	elva_PrepaidExpensesCurrent
Namespace Prefix:	elva_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

The element represents prepaid insurance net.

+ References

No definition available.

+ Details

Name:	elva_PrepaidInsuranceNet
Namespace Prefix:	elva_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

The element represents prepaid purchases.

+ References

No definition available.

+ Details

Name:	elva_PrepaidPurchases
Namespace Prefix:	elva_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

The element represents total prepad expenses.

+ References

No definition available.

+ Details

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