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Note 6 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment, Gross $ 19,756 $ 19,716
Less: accumulated depreciation (15,268) (14,940)
Property, plant and equipment, net 4,488 4,776
Machinery and Equipment [Member]    
Property, Plant and Equipment, Gross 7,437 7,198
Computer Equipment and Software [member]    
Property, Plant and Equipment, Gross 8,763 8,954
Leasehold Improvements [Member]    
Property, Plant and Equipment, Gross 2,157 2,151
Furniture and Fixtures [Member]    
Property, Plant and Equipment, Gross 1,309 1,321
Automobiles [Member]    
Property, Plant and Equipment, Gross $ 90 $ 92