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Note 6 - Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
END OF FISCAL YEAR
 
   
20
17
   
2016
 
   
(in thousands)
 
Land
  $
17,743
    $
16,063
 
Buildings
   
130,919
     
121,216
 
Equipment
   
371,300
     
350,539
 
                 
     
519,962
     
487,818
 
Accumulated depreciation
   
(307,317
)    
(283,310
)
                 
Property and Equipment   $
212,645
    $
204,508