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Note 3 - Share-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended
March 31,
  
   
2017
    
2016
  
Restricted share units:
                
Pretax compensation expense
   $
8,136
     $
7,968
  
Tax benefit
    
2,278
      
3,028
  
Restricted share unit expense, net of tax
   $
5,858
     $
4,940
  
Performance share units:
                
Pretax compensation expense
   $
3,034
     $
3,004
  
Tax benefit
    
849
      
1,142
  
Performance share unit expense, net of tax
   $
2,185
     $
1,862