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Note 17 - Income Taxes - Components of Net Deferred Income Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Deferred income tax assets:    
Accrued compensation $ 652 $ 733
R&D expenditure capitalization 4,366 3,064
Property and equipment (1,210) (1,249)
Other 0 (105)
Domestic Tax Jurisdiction [Member]    
Deferred income tax assets:    
Inventories 4,684  
Loss and tax credit carryforwards 34,129  
Intangible assets 245  
Property and equipment 321  
Other reserves 590  
Subtotal deferred income tax assets 44,987  
Valuation allowance (43,781)  
Net deferred income tax assets 1,206  
Total deferred income tax liabilities (1,210)  
Net deferred income tax liabilities $ (4)  
Foreign Tax Jurisdiction [Member]    
Deferred income tax assets:    
Inventories   5,447
Loss and tax credit carryforwards   31,850
Intangible assets   290
Property and equipment   331
Other reserves   456
Subtotal deferred income tax assets   42,171
Valuation allowance   (40,851)
Net deferred income tax assets   1,320
Total deferred income tax liabilities   (1,354)
Net deferred income tax liabilities   $ (34)