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Note 7 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property and equipment, at cost	$ 741	$ 834
Less: accumulated depreciation	(622)	(641)
Total property and equipment, net	119	193
Office and Laboratory Equipment [Member]
Property and equipment, at cost	20	20
Furniture and Fixtures [Member]
Property and equipment, at cost	157	157
Computer Equipment and Software [Member]
Property and equipment, at cost	412	464
Production Equipment [Member]
Property and equipment, at cost	0	114
Leasehold Improvements [Member]
Property and equipment, at cost	$ 152	$ 79

X

- Definition

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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- Definition

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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