v3.26.3
Note 2 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Number Of Customers 3 3    
Contract with Customer, Liability $ 99 $ 143    
Contract with Customer, Liability, Revenue Recognized 143      
Gain (Loss), Foreign Currency Transaction, before Tax $ 0 0    
Number of Reportable Segments 1      
Research and Development Expense $ 6,484 8,142    
Accounts Receivable, Allowance for Credit Loss, Current 0 0    
Inventory Valuation Reserves 338 346    
Long-Lived Asset, Held and Used, Impairment Loss $ 0 197    
Impairment, Long Lived Asset Held for Use, Statement of Income or Comprehensive Income, Extensible Enumeration, Not Disclosed [Flag] true      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest $ (14,423) $ (13,848) $ (11,700)  
Effective Income Tax Rate Reconciliation, Percent (0.03%) (0.01%) (0.01%)  
Unrecognized Tax Benefits $ 848 $ 762 $ 604  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%    
Treasury Stock, Value, Acquired, Cost Method $ 0     $ 119
Furniture, Fixtures, Equipment, and Leasehold Improvements [Member] | Minimum [Member]        
Property, Plant, and Equipment, Useful Life (Month) 60 months      
Furniture, Fixtures, Equipment, and Leasehold Improvements [Member] | Maximum [Member]        
Property, Plant, and Equipment, Useful Life (Month) 120 months      
Purchased Software [Member]        
Property, Plant, and Equipment, Useful Life (Month) 3 years      
Software, Internally Developed [Member]        
Property, Plant, and Equipment, Useful Life (Month) 3 years      
DHL Maintenance Agreements [Member]        
Contract with Customer, Liability, Revenue Recognized $ 91      
Returned Unit Pending Inspection [Member]        
Deferred Revenue $ 45