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Note 5 - Acquisition-related Items (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Acquisition Related Expenses [Table Text Block]
    2016   2015   2014
             
Transaction costs   $
2,794
     $
5,301
     $
9,103
  
Contingent consideration fair value adjustments    
(4,591
 )    
383
      
1,774
  
Contingent consideration compensation expense    
5,356
      
915
      
226
  
    $
3,559
     $
6,599
     $
11,103