Note 9 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, plant and equipment, gross	$ 24,602	$ 15,674
Accumulated depreciation and amortization	(14,260)	(10,968)
Property and equipment, net	10,342	4,706
Machinery, Manufacturing and Demonstration Equipment [Member]
Property, plant and equipment, gross	10,153	9,711
Operating Lease Assets [Member]
Property, plant and equipment, gross	9,203	710
Computer Equipment [Member]
Property, plant and equipment, gross	2,297	2,321
Furniture and Fixtures [Member]
Property, plant and equipment, gross	640	637
Leasehold Improvements [Member]
Property, plant and equipment, gross	$ 2,309	$ 2,295

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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