Note 7 - Select Balance Sheet and Statement of Operations Information - Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Lab equipment tooling and molds	$ 4,356	$ 8,194
Office furniture and equipment	1,240	1,743
Leasehold improvements	794	1,839
Computers and software	906	1,939
Demo units	214	114
Total property and equipment	7,547	13,866
Less: Accumulated depreciation	(5,690)	(11,197)
Total property and equipment, net	$ 1,857	2,669
Tools, Dies and Molds [Member] \| Minimum [Member]
Property and equipment, Useful lives	4
Tools, Dies and Molds [Member] \| Maximum [Member]
Property and equipment, Useful lives	10
Office Equipment [Member] \| Minimum [Member]
Property and equipment, Useful lives	6
Office Equipment [Member] \| Maximum [Member]
Property and equipment, Useful lives	10
Leasehold Improvements [Member] \| Maximum [Member]
Property and equipment, Useful lives	up to 10
Computer Equipment [Member]
Property and equipment, Useful lives	3
Vehicles [Member]
Vehicles	$ 37	$ 37
Vehicles [Member] \| Minimum [Member]
Property and equipment, Useful lives	5
Vehicles [Member] \| Maximum [Member]
Property and equipment, Useful lives	7
Demo Units [Member]
Property and equipment, Useful lives	5

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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