Note 16 - Income Taxes - Components of Net Deferred Income Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Deferred income tax assets:
Accrued compensation	$ 733	$ 870
R&D expenditure capitalization	3,064	1,538
Intangible assets	0	(292)
Property and equipment	(1,249)	(2,153)
Other	(105)	(6)
Domestic 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)
Foreign Tax Jurisdiction [Member]
Deferred income tax assets:
Inventories		8,269
Loss and tax credit carryforwards		29,581
Intangible assets		0
Property and equipment		504
Other reserves		590
Subtotal deferred income tax assets		41,352
Valuation allowance		(38,917)
Net deferred income tax assets		2,435
Total deferred income tax liabilities		(2,451)
Net deferred income tax liabilities		$ (16)