Note 4 - Property and Equipment, Net - Equipment, Furniture, and Leasehold Improvements (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Property and equipment, gross	$ 5,698	$ 5,327
Less: Accumulated depreciation and amortization	(2,939)	(2,281)
Property and equipment, net	$ 2,759	3,046
Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Property and equipment, gross	$ 3,111	2,933
Rental Program Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Property and equipment, gross	$ 1,812	1,619
Computer Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Property and equipment, gross	$ 242	243
Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Property and equipment, gross	$ 122	122
Furniture and Fixtures [Member]
Property, Plant and Equipment, Useful Life (Year)	7 years
Property and equipment, gross	$ 386	385
Software [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Property and equipment, gross	$ 25	$ 25

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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