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Note 10 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Years ended December 31,
 
   
2016
    
2017
    
2018
  
   
(in thousands, except per share data)
  
Numerator:
                        
Net income (loss)
   $
(96,378
 )   $
16,006
     $
57,821
  
                         
Denominator for basic earnings per share - weighted-average common shares outstanding
    
122,132
      
161,141
      
165,635
  
Effect of dilutive securities: Stock options, restricted shares and performance based shares
    
-
      
1,703
      
2,054
  
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed exercise of options, restricted shares and performance based shares
    
122,132
      
162,844
      
167,689
  
                         
                         
Net (loss) income per common share - basic
   $
(0.79
 )   $
0.10
     $
0.35
  
                         
Net (loss) income per common share - diluted
   $
(0.79
 )   $
0.10
     $
0.34