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Note 4 - Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, plant, and equipment, gross	$ 481	$ 442
Less: accumulated depreciation	(312)	(258)
Property and equipment, net	169	184
Office Equipment [Member]
Property, plant, and equipment, gross	213	181
Laboratory Equipment [Member]
Property, plant, and equipment, gross	127	121
Automobiles [Member]
Property, plant, and equipment, gross	24	24
Leasehold Improvements [Member]
Property, plant, and equipment, gross	$ 117	$ 116

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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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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