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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

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

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

X
- 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

X
- 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

X
- 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