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Note 6 - Property and Equipment (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31, 2017
    
December 31, 201
6
  
   
(In thousands)
  
Property and equipment
   $
39,186
     $
37,890
  
Accumulated depreciation
    
(27,053
 )    
(26,084
 )
Property and equipment, net
   $
12,133
     $
11,806