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Note 11 - Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
Fiscal Quarter
  
   
First
    
Second
    
Third
    
Fourth
  
   
(In thousands, except for per share data)
  
Year Ended December 31, 2017:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Revenue (less agency commissions)
   $
203,461
     $
226,681
     $
218,977
     $
233,609
  
Operating income
    
43,558
      
142,555
      
50,024
      
55,089
  
Net income
    
10,505
      
70,561
      
15,316
      
165,570
  
                                 
Basic net income per share
   $
0.15
     $
0.98
     $
0.21
     $
2.15
  
                                 
Diluted net income per share
   $
0.14
     $
0.97
     $
0.21
     $
2.13
  
                                 
Year Ended December 31, 2016:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Revenue (less agency commissions)
   $
173,723
     $
196,633
     $
204,490
     $
237,619
  
Operating income
    
36,111
      
53,687
      
60,467
      
83,874
  
Net income (loss)
    
8,990
      
17,662
      
(213
 )    
35,834
  
                                 
Basic net income (loss) per share
   $
0.13
     $
0.25
     $
-
     $
0.50
  
                                 
Diluted net income (loss) per share
   $
0.12
     $
0.24
     $
-
     $
0.49