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Note 4 - Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
 
 
June 30,
2017
 
 
December 31,
2016
 
Land
  $
4,157
    $
4,099
 
Buildings
   
105,733
     
104,952
 
Machinery and equipment
   
168,461
     
165,157
 
     
278,351
     
274,208
 
Less accumulated depreciation
   
(158,910
)
   
(152,141
)
Property, plant and equipment, net
  $
119,441
    $
122,067