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Note 14 - Net (Loss) Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
 
 
 
  
Weighted-Average
   
 
 
 
   
 
 
 
  
Shares
    
 
 
 
   
Net Loss
    
Outstanding
    
Per Share
  
   
(Numerator)
    
(Denominator)
    
Amount
  
2019
  
 
 
 
  
 
 
 
  
 
 
 
Basic and diluted
   $
(68,552
 )    
85,607
     $
(0.80
 )
2018
  
 
 
 
  
 
 
 
  
 
 
 
Basic and diluted
   $
(67,657
 )    
77,890
     $
(0.87
 )
2017
  
 
 
 
  
 
 
 
  
 
 
 
Basic and diluted
   $
(51,013
 )    
70,284
     $
(0.73
 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
2019
    
2018
    
2017
  
Stock options
    
5,811
      
3,794
      
2,395
  
Contingent consideration liability
(1)
    
766
      
2,619
      
2,824
  
Total securities excluded
  
 
6,577
    
 
6,413
    
 
5,219