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Note 6 - Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2018
    
2017
    
2018
    
2017
  
   
(in thousands, except per share data)
  
Numerator:
                                
                                 
Net income
   $
(10,554
 )   $
7,195
     $
225
     $
20,885
  
Denominator for basic earnings per share - weighted-average common shares outstanding
    
165,162
      
162,357
      
164,812
      
158,259
  
Effect of dilutive securities: Stock options, restricted shares and performance based shares
    
-
      
1,448
      
2,903
      
1,683
  
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed exercise of options, restricted shares and performance based shares
    
165,162
      
163,805
      
167,715
      
159,942
  
                                 
Net (loss) income per common share - basic
   $
(0.06
 )   $
0.04
     $
0.00
     $
0.13
  
                                 
Net (loss) income per common share - diluted
   $
(0.06
 )   $
0.04
     $
0.00
     $
0.13