Note 8 - Property and Equipment, Net - Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
Property and equipment, gross	$ 5,467	$ 5,325
Accumulated depreciation	(3,984)	(3,774)
Property and equipment, net	1,483	1,551
Furniture and Fixtures [Member]
Property and equipment, gross	1,622	1,582
Machinery and Equipment [Member]
Property and equipment, gross	1,480	1,441
Leasehold Improvements [Member]
Property and equipment, gross	2,294	2,302
Construction in Progress [Member]
Property and equipment, gross	$ 71	$ 0