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Note 12 - Selected Quarterly Financial Data (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2018
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, 2018:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenue (less agency commissions)
  $
226,258
    $
250,344
    $
279,310
    $
328,220
 
Operating income
   
50,035
     
79,690
     
108,402
     
150,644
 
Net income
   
19,945
     
40,705
     
61,886
     
88,267
 
                                 
Basic net income per share
  $
0.22
    $
0.46
    $
0.71
    $
1.01
 
                                 
Diluted net income per share
  $
0.22
    $
0.46
    $
0.70
    $
1.00
 
                                 
Year Ended December 31, 2017:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenue (less agency commissions)
  $
203,461
    $
226,681
    $
218,977
    $
233,609
 
Operating income
   
43,472
     
142,394
     
49,900
     
54,965
 
Net income (loss)
   
10,505
     
70,561
     
15,316
     
165,570
 
                                 
Basic net income (loss) per share
  $
0.15
    $
0.98
    $
0.21
    $
2.15
 
                                 
Diluted net income (loss) per share
  $
0.14
    $
0.97
    $
0.21
    $
2.13