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Note 4 - Acquisition-related Items
12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Business Combination Disclosure Acquisition Related Items [Text Block]
4.
Acquisition-related items
 
Acquisition-related expense (income) comprises the following:
 
      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
 
 
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.