Note 3 - Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Jun. 30, 2025
Property and equipment, gross	$ 807	$ 758
Accumulated depreciation	(756)	(743)
Net property and equipment	51	15
Leasehold Improvements [Member]
Property and equipment, gross	$ 213	213
Property and Equipment Useful Life (Year)	5 years
Machinery and Equipment [Member]
Property and equipment, gross	$ 357	308
Machinery and Equipment [Member] \| Minimum [Member]
Property and Equipment Useful Life (Year)	3 years
Machinery and Equipment [Member] \| Maximum [Member]
Property and Equipment Useful Life (Year)	7 years
Furniture and Fixtures [Member]
Property and equipment, gross	$ 45	45
Property and Equipment Useful Life (Year)	5 years
Computer Equipment [Member]
Property and equipment, gross	$ 72	72
Property and Equipment Useful Life (Year)	3 years
Other Equipment [Member]
Property and equipment, gross	$ 120	$ 120
Other Equipment [Member] \| Minimum [Member]
Property and Equipment Useful Life (Year)	3 years
Other Equipment [Member] \| Maximum [Member]
Property and Equipment Useful Life (Year)	7 years

Amount of accumulated depreciation, depletion, and amortization of property, plant, and equipment. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection.

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