Note 9 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, plant and equipment, gross	$ 20,660	$ 24,061
Accumulated depreciation and amortization	(9,689)	(13,719)
Property and equipment, net	10,971	10,342
Machinery, Manufacturing and Demonstration Equipment [Member]
Property, plant and equipment, gross	8,289	9,909
Operating Lease Assets [Member]
Property, plant and equipment, gross	10,143	8,906
Computer Equipment [Member]
Property, plant and equipment, gross	325	2,297
Furniture and Fixtures [Member]
Property, plant and equipment, gross	644	640
Leasehold Improvements [Member]
Property, plant and equipment, gross	$ 1,259	$ 2,309

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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