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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