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Note 5 - Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
June
3
0
, 2019
   
December 31, 2018
 
Land
  $
3,876
    $
3,869
 
Buildings
   
107,676
     
106,940
 
Machinery and equipment
   
180,338
     
177,668
 
 
   
291,890
     
288,477
 
Less accumulated depreciation
   
(181,364
)
   
(174,984
)
Property, plant and equipment, net
  $
110,526
    $
113,493