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Note 12 - Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
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, 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
    
8,990
     
17,662
     
(213
 )    
35,834
 
                                 
Basic net income per share
   $
0.13
    $
0.25
    $
-
    $
0.50
 
                                 
Diluted net income per share
   $
0.12
    $
0.24
    $
-
    $
0.49
 
                                 
Year Ended December 31, 2015:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenue (less agency commissions)
   $
133,303
    $
143,464
    $
151,102
    $
169,487
 
Operating income
   
28,058
     
38,758
     
29,344
     
43,897
 
Net income
    
5,595
     
12,110
     
6,609
     
14,987
 
                                 
Basic net income per share
   $
0.10
    $
0.17
    $
0.09
    $
0.21
 
                                 
Diluted net income per share
   $
0.10
    $
0.17
    $
0.09
    $
0.21