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Note 7 - Property, Plant and Equipment, Net (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31,
   
December 31,
 
   
2020
   
2019
 
Land
  $
1,423
    $
1,431
 
Buildings and improvements
   
30,550
     
29,722
 
Machinery and equipment
   
132,447
     
132,134
 
Construction in progress
   
2,645
     
5,090
 
     
167,065
     
168,377
 
Accumulated depreciation
   
(126,204
)    
(126,434
)
Property, plant and equipment, net
  $
40,861
    $
41,943