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Note 10 - Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2017 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
HK |  | $ (5,673) | $ (765) | $ (3,161)
Income Tax Expense (Benefit) |  | 117 | 0 | 0
Foreign Tax Jurisdiction [Member] | Inland Revenue, Hong Kong [Member] |  |  |  |
HK |  | $ (5,673) | $ (765) | $ (3,161)
HK statutory income tax rate | 16.50% | 16.50% | 16.50% | 16.50%
Income tax at HK statutory income tax rate |  | $ 0 | $ 0 | $ 0
Tax effect of prior-year tax filing difference |  | 117 | 0 | 0
Income Tax Expense (Benefit) |  | $ 117 | $ 0 | $ 0

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