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Note 5 - Property, Plant and Equipment (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31,
2020
   
December 31,
2019
 
Land
  $
4,968
    $
4,998
 
Buildings
   
109,758
     
110,162
 
Machinery and equipment
   
183,622
     
182,922
 
 
   
298,348
     
298,082
 
Less accumulated depreciation
   
(188,523
)
   
(186,303
)
Property, plant and equipment, net
  $
109,825
    $
111,779