Income tax expense, Unrecognized Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Jun. 30, 2025
Unrecognized deferred tax assets [Abstract]
Total tax losses	$ 49,227	$ 50,563
Tax losses utilised	(4,419)	(4,688)
Deferred tax asset on losses not recognized	$ 44,808	$ 45,875

The amount of deferred tax asset on losses for which no deferred tax asset is recognized in the statement of financial position.

No definition available.

Name:	ionr_DeferredTaxAssetOnLossesForWhichNoDeferredTaxAssetRecognized
Namespace Prefix:	ionr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant