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Note 5 - Acquisition-related Items (Tables)
12 Months Ended
Dec. 31, 2014
Business Combination Disclosure Acquisition Related Items [Abstract]  
Schedule of Acquisition-Related Expenses [Table Text Block]
 
 
2014
   
2013
   
2012
 
 
 
 
   
 
   
 
 
Transaction costs
  $ 9,454     $ 3,336     $ 5,032  
Contingent consideration fair value adjustments
    2,145       1,801       3,645  
Contingent consideration compensation expense
    226       6,181       5,096  
Reclassification from accumulated other comprehensive loss
    -       -       2,553  
Gain on revaluation of previously held equity investment (note 3)
    -       (820 )     -  
 
  $ 11,825     $ 10,498     $ 16,326