Note 4 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Property and equipment, gross	$ 1,104	$ 994
Accumulated depreciation	(673)	(463)
Property and equipment, net	431	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	$ 511	405
Estimated useful life (Year)	5 years
Leasehold Improvements [Member]
Property and equipment, gross	$ 380	$ 380

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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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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