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Note 8 - Net Income Per Share of Class A and Class B Common Stock (Tables)
 9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Three Months Ended September 30,
 
2016
 
 
2015
 
(in thousands, except per share data)
 
Class A
 
 
Class B
 
 
Class A
 
 
Class B
 
Net income applicable to common stockholders - basic
   $ 50,262     $ 3,779     $ 39,162     $ 4,229  
Reallocation of net income as a result of conversion of dilutive stock options
     1       (1
)
     3       (3
)
Reallocation of net income due to conversion of Class B to Class A common shares outstanding
     439       —       509       —  
Conversion of Class B common shares into Class A common shares
     3,326       —       3,690       —  
Effect of dilutive stock options on net income
     13       (13
)
     27       (27
)
Net income applicable to common stockholders - diluted
   $ 54,041     $ 3,765     $ 43,391     $ 4,199  
                                 
Weighted average common shares outstanding – basic
     23,432       1,762       23,727       2,562  
Conversion of Class B common shares into Class A common shares
     1,762       —       2,562       —  
Effect of dilutive stock options on weighted average common shares
     96       —       191       —  
Weighted average common shares outstanding – diluted
     25,290       1,762       26,480       2,562  
                                 
Net income per common share - basic
   $ 2.14     $ 2.14     $ 1.65     $ 1.65  
Net income per common share - diluted
   $ 2.14     $ 2.14     $ 1.64     $ 1.64  
Three Months Ended September 30,
 
2016
 
 
2015
 
Diluted EPS
 
Class A
 
 
Class B
 
 
Class A
 
 
Class B
 
Antidilutive Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Shares issuable pursuant to stock options not included since they were antidilutive
     —       —       18       —  
Nine Months Ended September 30,
 
2016
 
 
2015
 
(in thousands, except per share data)
 
Class A
 
 
Class B
 
 
Class A
 
 
Class B
 
Net income applicable to common stockholders - basic
   $ 134,533     $ 11,206     $ 122,092     $ 13,175  
Reallocation of net income as a result of conversion of dilutive stock options
     5       (5
)
     11       (11
)
Reallocation of net income due to conversion of Class B to Class A common shares outstanding
     1,365       —       1,425       —  
Conversion of Class B common shares into Class A common shares
     9,794       —       11,653       —  
Effect of dilutive stock options on net income
     42       (42
)
     86       (86
)
Net income applicable to common stockholders - diluted
   $ 145,739     $ 11,159     $ 135,267     $ 13,078  
                                 
Weighted average common shares outstanding – basic
     23,530       1,960       23,742       2,562  
Conversion of Class B common shares into Class A common shares
     1,960       —       2,562       —  
Effect of dilutive stock options on weighted average common shares
     108       —       196       —  
Weighted average common shares outstanding – diluted
     25,598       1,960       26,500       2,562  
                                 
Net income per common share - basic
   $ 5.72     $ 5.72     $ 5.14     $ 5.14  
Net income per common share - diluted
   $ 5.69     $ 5.69     $ 5.10     $ 5.10  
Nine Months Ended September 30,
 
2016
 
 
2015
 
Diluted EPS
 
Class A
 
 
Class B
 
 
Class A
 
 
Class B
 
Antidilutive Securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Shares issuable pursuant to stock options not included since they were antidilutive
     —       —       17       —