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Note 6 - Acquisition-related Items (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Acquisition Related Expenses [Table Text Block]
     
Year ended December 31,
  
      2020       2019  
                 
Transaction costs (note 4)   $
16,169
     $
5,725
  
Contingent consideration fair value adjustments    
23,393
      
10,849
  
Contingent consideration compensation expense    
6,286
      
11,958
  
    $
45,848
     $
28,532