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Note 4 - Property, Plant and Equipment (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
September
3
0
,
2017
   
December 31,
2016
 
Land
  $
4,148
    $
4,099
 
Buildings
   
106,356
     
104,952
 
Machinery and equipment
   
168,190
     
165,157
 
 
   
278,694
     
274,208
 
Less accumulated depreciation
   
(161,223
)
   
(152,141
)
Property, plant and equipment, net
  $
117,471
    $
122,067