Note 15 - Income Taxes - Components of Net Deferred Income Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Deferred income tax assets:
Accrued compensation	$ 870	$ 609
R&D expenditure capitalization	1,538	0
Property and equipment	(2,153)	(2,874)
Other	(6)	(109)
Domestic Tax Authority [Member]
Deferred income tax assets:
Inventories	8,269
Loss and tax credit carry-forwards	29,581
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
Intangible assets	(292)
Total deferred income tax liabilities	(2,451)
Net deferred income tax liabilities	$ (16)
Foreign Tax Authority [Member]
Deferred income tax assets:
Inventories		8,513
Loss and tax credit carry-forwards		34,643
Property and equipment		578
Other reserves		359
Subtotal deferred income tax assets		44,702
Valuation allowance		(41,376)
Net deferred income tax assets		3,326
Intangible assets		(356)
Total deferred income tax liabilities		(3,339)
Net deferred income tax liabilities		$ (13)