v3.25.2
Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Revenues $ 1,000 $ 1,700  
Gain (Loss), Foreign Currency Transaction, before Tax 0 0  
Research and Development Expense 8,142 6,790  
Accounts Receivable, Allowance for Credit Loss, Current 0 0  
Inventory Valuation Reserves 346 296  
Impairment, Long-Lived Asset, Held-for-Use 197 0  
Treasury Stock, Value, Acquired, Cost Method $ 0 $ (0) $ 119
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] Operating Expenses    
Furniture, Fixtures, Equipment, and Leasehold Improvements [Member]      
Property, Plant and Equipment, Useful Life (Year) 5 years    
Purchased Software [Member]      
Property, Plant and Equipment, Useful Life (Year) 3 years