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Note 6 - Property, Plant and Equipment
 3 Months Ended
Mar. 31, 2020
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]
6.
Property, Plant and Equipment
Property, plant, and equipment consist of the following:
 
    March 31,
2020		   December 31,
2019
    (in thousands)
Machinery and equipment   $
7,437
     $
7,198
  
Computer equipment and software    
8,763
      
8,954
  
Leasehold improvements    
2,157
      
2,151
  
Furniture and fixtures    
1,309
      
1,321
  
Automobiles    
90
      
92
  
     
19,756
      
19,716
  
Less: accumulated depreciation    
(15,268
 )    
(14,940
 )
Property, plant and equipment, net   $
4,488
     $
4,776