Note 4 - Property and Equipment, Net - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023
Property and equipment, gross	$ 9,815	$ 9,422
Less: Accumulated depreciation and amortization	(7,930)	(7,769)
Total	1,885	1,653
Land and Building [Member]
Property and equipment, gross	1,250	1,250
Leasehold Improvements [Member]
Property and equipment, gross	1,341	1,371
Machinery and Equipment [Member]
Property and equipment, gross	$ 7,224	$ 6,801