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Note 6 - Property and Equipment (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
September
30, 2017
   
December 31, 2016
 
   
(In thousands)
 
Property and equipment
  $
41,183
    $
37,890
 
Accumulated depreciation
   
(29,094
)
   
(26,084
)
Property and equipment, net
  $
12,089
    $
11,806