Note 5 - Property and Equipment, Net - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property and equipment, gross	$ 1,223	$ 574
Accumulated depreciation	(335)	(217)
Property and equipment, net	888	357
Production and Lab Equipment [Member]
Property and equipment, gross	450	148
Tooling [Member]
Property and equipment, gross	188	81
Computer Equipment [Member]
Property and equipment, gross	408	180
Furniture and Fixtures [Member]
Property and equipment, gross	$ 177	$ 165

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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