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Note 4 - Acquisition-related Items (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Acquisition Related Expenses [Table Text Block]
      2017       2016  
         
Transaction costs   $
6,247
     $
2,794
  
Contingent consideration fair value adjustments    
1,054
      
(4,591
 )
Contingent consideration compensation expense    
7,626
      
5,356
  
    $
14,927
     $
3,559