Note 4 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Property and equipment, gross	$ 1,067	$ 994
Accumulated depreciation	(618)	(463)
Property and equipment, net	449	531
Machinery and Equipment [Member]
Property and equipment, gross	$ 42	38
Estimated useful life (Year)	5 years
Trade Show Booth [Member]
Property and equipment, gross	$ 171	171
Estimated useful life (Year)	5 years
Office Equipment [Member]
Property and equipment, gross	$ 474	405
Estimated useful life (Year)	5 years
Leasehold Improvements [Member]
Property and equipment, gross	$ 380	$ 380
Estimated useful life	Lesser of lease term or estimated useful life

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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Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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