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Note 5 - Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   

June 30,

2020

   

December 31,

2019

 

Land

  $ 5,612     $ 4,998  

Buildings

    110,679       110,162  

Machinery and equipment

    184,285       182,922  
      300,576       298,082  

Less accumulated depreciation

    (191,419

)

    (186,303

)

Property, plant and equipment, net

  $ 109,157     $ 111,779