v3.26.3
Note 10 - Income Taxes - Summary of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Tax at Federal Statutory Rate $ (3,029) $ (2,908)  
Tax at Federal Statutory Rate, percent 21.00% 21.00%  
State and local income tax, net of federal (national) income tax effect(1) $ 3 [1] $ 2  
State and local income tax, net of federal (national) income tax effect, percent [1] (0.02%)    
Changes in valuation allowances $ 2,973 3,127  
Changes in valuation allowances, percent (20.62%)    
Nontaxable or nondeductible items $ 69    
Nontaxable or nondeductible items, percent (0.48%)    
Expiration of NOL and Charitable Contribution C/O $ 264 1  
Expiration of NOL and Charitable Contribution C/O, percent (1.83%)    
Other $ (89)    
Other, percent 0.62%    
Provision (Benefit) for Income Taxes $ 4 $ 2  
Provision (Benefit) for Income Taxes, percent (0.03%) (0.01%) (0.01%)
Research Tax Credit Carryforward [Member]      
Federal R&D Credit $ (187) $ 347  
Federal R&D Credit, percent 1.30%    
[1] State taxes in Massachusetts and Oregon made up the majority (greater than 50%) of the tax effect int his category.