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Note 3 - Share-based Compensation (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended
March 31,
 
   
2018
   
2017
 
Restricted share units:
               
Pretax compensation expense
  $
8,591
    $
8,136
 
Tax benefit
   
2,234
     
2,278
 
Restricted share unit expense, net of tax
  $
6,357
    $
5,858
 
Performance share units:
               
Pretax compensation expense
  $
3,445
    $
3,034
 
Tax benefit
   
896
     
849
 
Performance share unit expense, net of tax
  $
2,549
    $
2,185