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Note 6 - Property and Equipment (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
June 30, 2017
    
December 31, 2016
  
   
(In thousands)
  
Property and equipment
   $
40,209
     $
37,890
  
Accumulated depreciation
    
(28,071
)
    
(26,084
)
Property and equipment, net
   $
12,138
     $
11,806