| Line Item | Dec 31, 2025 | Jun 30, 2024 | Jun 30, 2023 | Jun 30, 2022 | Jun 30, 2021 | Jun 30, 2020 |
|---|---|---|---|---|---|---|
| Expenses | ||||||
| General and administrative | ||||||
| Demonstration Plant operations | ||||||
| Management and directors' fees | ||||||
| Share-based compensation | ||||||
| Separation benefits | ||||||
| Other | ||||||
| Foreign exchange loss (gain) | ||||||
| Loss from operations | ||||||
| Gain on deconsolidation of subsidiaries | — | |||||
| Impairment expense | ||||||
| Investment loss from Smackover Lithium | ||||||
| Fair value gain on financial asset - FID | ||||||
| Fair value gain on Investment in Aqualung | ||||||
| Interest and other income | ||||||
| Interest expense | ||||||
| Net (loss) income before income taxes | ||||||
| Deferred income tax benefit (expense) | ||||||
| Net (loss) income | ||||||
| Item that may be reclassified subsequently to income or loss: | ||||||
| Currency translation differences of foreign operations | ||||||
| Total comprehensive (loss) income | ||||||
| Basic (loss) earnings per share (in USD per share) | ||||||
| Diluted (loss) earnings per share (in USD per share) |