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Note 5 - Acquisition-related Items
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Business Combination Disclosure Acquisition Related Items [Text Block]
5.
Acquisition-related items
 
Acquisition-related expense (income) comprises the following:
 
    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
  
 
Contingent consideration compensation expense and contingent consideration fair value adjustments relate to acquisitions made in the current year as well as the preceding
four
years.