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Note 8 - Property and Equipment (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
September 30,
2018
   
December 31,
2017
 
   
(In thousands)
 
Property and equipment
  $
45,094
    $
40,206
 
Accumulated depreciation
   
(30,825
)
   
(27,847
)
Property and equipment, net
  $
14,269
    $
12,359