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Note 3 - Share-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended
September 30,
    
Nine Months Ended
September 30,
  
   
2016
    
2015
    
2016
    
2015
  
Restricted share units:
  
Pretax compensation expense
   $ 5,390     $ 4,668     $ 22,298     $ 20,372  
Tax benefit
     2,048       1,778       8,473       7,762  
Restricted share unit expense, net of tax
   $ 3,342     $ 2,890     $ 13,825     $ 12,610  
Performance share units:
 
Pretax compensation expense
   $ 1,868     $ 1,645     $ 7,875     $ 6,638  
Tax benefit
     710       627       2,992       2,529  
Performance share unit expense, net of tax
   $ 1,158     $ 1,018     $ 4,883     $ 4,109