Note 5 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Property and equipment, at cost	$ 581	$ 718
Less: Impairment	(30)	0
Less: Accumulated depreciation	(539)	(674)
Property and equipment, net	12	44	$ 44
Office and Laboratory Equipment [Member]
Property and equipment, at cost	20	20
Furniture and Fixtures [Member]
Property and equipment, at cost	73	157
Computer Equipment and Software [Member]
Property and equipment, at cost	336	389
Leasehold Improvements [Member]
Property and equipment, at cost	$ 152	$ 152

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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