Note 3 - Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment, Gross	$ 4,103	$ 4,089
Less: Accumulated depreciation and amortization	(2,699)	(2,559)
Accumulated impairment loss	(1,004)	(1,004)
Property and equipment, net	400	526
Equipment and Furniture [Member]
Property, Plant and Equipment, Gross	1,430	1,416
Buildings, Leasehold, and Building Improvements [Member]
Property, Plant and Equipment, Gross	$ 2,673	$ 2,673