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Note 12 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
2018
    
2017
    
2016
  
Numerator-
                        
Numerator for basic and diluted earnings per share −
                        
Net income available to common shareholders
   $
139,062
     $
172,129
     $
40,582
  
Denominator-
                        
Denominator for basic earnings per share – weighted average shares outstanding
    
39,223
      
39,627
      
39,938
  
Effect of dilutive securities−
                        
Employee and director stock options and restricted share awards
    
1,070
      
1,353
      
665
  
Denominator for diluted earnings per share − adjusted weighted average shares outstanding and assumed conversions
    
40,293
      
40,980
      
40,603
  
Basic earnings per common share
   $
3.55
     $
4.34
     $
1.02
  
Diluted earnings per common share and common share equivalents
   $
3.45
     $
4.20
     $
1.00
  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
2018
    
2017
    
2016
  
Anti-dilutive options – weighted average
    
513
      
449
      
2,043