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v3.25.2

Lease liability (Details 2) $ in Thousands | 9 Months Ended
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Jun. 30, 2025 USD ($)
Lease liability |
2025 | $ 627
2026 | 528
2027 | 544
2028 | 560
2029 | $ 284

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

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

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

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

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

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