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Note 12 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
201
7
    
201
6
    
201
5
  
                         
Numerator-
                        
Numerator for basic and diluted earnings per share
−
                        
Net income available to common shareholders
   $
172,129
     $
40,582
     $
66,053
  
Denominator-
                        
Denominator for basic earnings per share
– weighted average shares
outstanding
    
39,627
      
39,938
      
40,271
  
Effect of dilutive securities
−
                        
Employee and director stock options and restricted share awards
    
1,353
      
665
      
822
  
Denominator for diluted earnings per share
− adjusted weighted average shares outstanding and assumed conversions
    
40,980
      
40,603
      
41,093
  
Basic earnings per common share
   $
4.34
     $
1.02
     $
1.64
  
Diluted earnings per common share and common share equivalents
   $
4.20
     $
1.00
     $
1.96
  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
201
7
    
201
6
    
201
5
  
A
nti-dilutive options – weighted average
    
449
      
2,043
      
1,186