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Note 7 - Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
September 30,
    
December 31,
  
   
2019
    
2018
  
Land
   $
1,426
     $
2,251
  
Buildings and improvements
    
29,341
      
30,119
  
Machinery and equipment
    
128,766
      
126,747
  
Construction in progress
    
6,363
      
4,687
  
     
165,896
      
163,804
  
Accumulated depreciation
    
(123,426
 )    
(119,872
 )
Property, plant and equipment, net
   $
42,470
     $
43,932