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Note 5 - Property, Plant and Equipment (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
September
3
0
,
2019
   
December 31,
2018
 
Land
  $
4,936
    $
3,869
 
Buildings
   
109,143
     
106,940
 
Machinery and equipment
   
181,417
     
177,668
 
 
   
295,496
     
288,477
 
Less accumulated depreciation
   
(184,143
)
   
(174,984
)
Property, plant and equipment, net
  $
111,353
    $
113,493