Note 4 - Property and Equipment, Net - Equipment, Furniture, and Leasehold Improvements (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Property and equipment, gross	$ 5,327	$ 4,429
Less: Accumulated depreciation and amortization	(2,281)	(1,513)
Property and equipment, net	$ 3,046	2,916
Equipment [Member]
Property, Plant and Equipment, Useful Life	5 years
Property and equipment, gross	$ 2,933	3,571
Rental Program Equipment [Member]
Property, Plant and Equipment, Useful Life	5 years
Property and equipment, gross	$ 1,619
Computer Equipment [Member]
Property, Plant and Equipment, Useful Life	3 years
Property and equipment, gross	$ 243	309
Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life	3 years
Property and equipment, gross	$ 384	403
Furniture and Fixtures [Member]
Property, Plant and Equipment, Useful Life	7 years
Property and equipment, gross	$ 123	121
Software [Member]
Property, Plant and Equipment, Useful Life	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.

+ References

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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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