Note 4 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Property and equipment, gross	$ 949	$ 1,104
Accumulated depreciation	(618)	(673)
Property and equipment, net	331	431
Machinery and Equipment [Member]
Property and equipment, gross	$ 41	42
Estimated useful life (Year)	5 years
Trade Show Booth [Member]
Property and equipment, gross	$ 202	171
Estimated useful life (Year)	5 years
Office Equipment [Member]
Property and equipment, gross	$ 528	511
Estimated useful life (Year)	5 years
Leasehold Improvements [Member]
Property and equipment, gross	$ 178	$ 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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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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