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Note 17 - Net Income Per Share of Class A and Class B Common Stock (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Year Ended December 31,
 
2016
 
 
2015
 
 
2014
 
(in thousands, except per share data)
 
Class A
 
 
Class B
 
 
Class A
 
 
Class B
 
 
Class A
 
 
Class B
 
Net income applicable to common stockholders - basic
   $
182,369
     $
14,689
     $
165,172
     $
17,827
     $
122,246
     $
13,294
  
Reallocation of distributed net income as a result of conversion of dilutive stock options
    
8
      
(8
)
    
15
      
(15
)
    
15
      
(15
)
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding
    
1,791
      
—
      
1,932
      
—
      
1,547
      
—
  
Conversion of Class B common shares into Class A common shares
    
12,833
      
—
      
15,760
      
—
      
11,616
      
—
  
Effect of dilutive stock options on net income
    
57
      
(57
)
    
120
      
(120
 )    
116
      
(116
)
Net income applicable to common stockholders - diluted
   $
197,058
     $
14,624
     $
182,999
     $
17,692
     $
135,540
     $
13,163
  
                                                 
Weighted average common shares outstanding – basic
    
23,515
      
1,894
      
23,729
      
2,561
      
23,559
      
2,562
  
Conversion of Class B common shares into Class A common shares
    
1,894
      
—
      
2,561
      
—
      
2,562
      
—
  
Effect of dilutive stock options on weighted average common shares
    
112
      
—
      
200
      
—
      
261
      
—
  
Weighted average common shares outstanding – diluted
    
25,521
      
1,894
      
26,490
      
2,561
      
26,382
      
2,562
  
                                                 
Net income per common share - basic
   $
7.76
     $
7.76
     $
6.96
     $
6.96
     $
5.19
     $
5.19
  
Net income per common share - diluted
   $
7.72
     $
7.72
     $
6.91
     $
6.91
     $
5.14
     $
5.14
  
                                                 
Antidilutive Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Shares issuable pursuant to stock options not included since they were antidilutive
    
—
      
—
      
16
      
—
      
13
      
—