Note 6 - Select Balance Sheet and Statement of Operations Information - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Lab equipment tooling and molds	$ 3,579	$ 4,356
Office furniture and equipment	1,246	1,240
Leasehold improvements	616	794
Computers and software	919	906
Demo units	214	214
Total property and equipment	6,611	7,547
Less: Accumulated depreciation	(4,868)	(5,690)
Total property and equipment, net	$ 1,743	1,857
Tools, Dies and Molds [Member] \| Minimum [Member]
Property and equipment, Useful lives (Year)	4 years
Tools, Dies and Molds [Member] \| Maximum [Member]
Property and equipment, Useful lives (Year)	10 years
Office Equipment [Member] \| Minimum [Member]
Property and equipment, Useful lives (Year)	6 years
Office Equipment [Member] \| Maximum [Member]
Property and equipment, Useful lives (Year)	10 years
Leasehold Improvements [Member] \| Maximum [Member]
Property and equipment, Useful lives (Year)	10 years
Computer Equipment [Member]
Property and equipment, Useful lives (Year)	3 years
Vehicles [Member]
Vehicles	$ 37	$ 37
Vehicles [Member] \| Minimum [Member]
Property and equipment, Useful lives (Year)	5 years
Vehicles [Member] \| Maximum [Member]
Property and equipment, Useful lives (Year)	7 years
Demo Units [Member]
Property and equipment, Useful lives (Year)	5 years

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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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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