XML 123 R71.htm IDEA: XBRL DOCUMENT v3.25.2

Financial Instruments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2025	Sep. 30, 2024
Statement [Line Items]
Warrants	$ 251	$ 155
Level 1
Statement [Line Items]
Warrants	0	0
Level 2
Statement [Line Items]
Warrants	25	155
Level 3
Statement [Line Items]
Warrants	$ 0	$ 0

X

- References

No definition available.

+ Details

Name:	elva_FairValueOfWarrant
Namespace Prefix:	elva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=elva_LevelOneOfFairValuesHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=elva_LevelTwoOfFairValuesHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_LevelsOfFairValueHierarchyAxis=elva_LevelThreeOfFairValuesHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: