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Note 4 - Property and Equipment, Net - Summary of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Property and equipment, gross	$ 804		$ 801
Less accumulated depreciation	(788)		(785)
Property and equipment, net	16	$ 16	16
Computer Equipment and Software [Member]
Property and equipment, gross	174		172
Laboratory and Manufacturing Equipment [Member]
Property and equipment, gross	577		576
Furniture and Fixtures [Member]
Property and equipment, gross	27		27
Leasehold Improvements [Member]
Property and equipment, gross	$ 26		$ 26

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- Definition

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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