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Note 8 - Property, Plant and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31,
  
   
2019
    
2018
  
Land
   $
1,431
     $
2,251
  
Buildings and improvements
    
29,722
      
30,119
  
Machinery and equipment
    
132,134
      
126,747
  
Construction in progress
    
5,090
      
4,687
  
     
168,377
      
163,804
  
Accumulated depreciation
    
(126,434
 )    
(119,872
 )
Property, plant and equipment, net
   $
41,943
     $
43,932