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Note 5 - Balance Sheet Information - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment, Gross $ 17,864 $ 20,557
Less: accumulated depreciation (14,449) (16,597)
Property, plant and equipment, net 3,415 3,960
Machinery and Equipment [Member]    
Property, Plant and Equipment, Gross 7,698 7,450
Computer Equipment and Software [member]    
Property, Plant and Equipment, Gross 6,269 9,114
Leasehold Improvements [Member]    
Property, Plant and Equipment, Gross 2,560 2,540
Furniture and Fixtures [Member]    
Property, Plant and Equipment, Gross 1,296 1,353
Automobiles [Member]    
Property, Plant and Equipment, Gross $ 41 $ 100