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Note 8 - Net Income Per Share of Class A and Class B Common Stock (Tables)
 6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Three Months Ended June 30,
 
2016
 
 
2015
 
Basic EPS
 
Class A
 
 
Class B
 
 
Class A
 
 
Class B
 
Numerator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income applicable to common stockholders
   $ 47,869     $ 3,559     $ 46,239     $ 4,984  
Distributed net income applicable to common stockholders
     (5,932
)
     (441
)
     (4,754
)
     (512
)
Basic undistributed net income applicable to common stockholders
   $ 41,937     $ 3,118     $ 41,485     $ 4,472  
                                 
Denominator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of shares outstanding used to calculate basic net income per share
     23,700       1,762       23,770       2,562  
                                 
Earnings per Share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic net income per share applicable to common stockholders
   $ 2.02     $ 2.02     $ 1.95     $ 1.95  
Basic distributed net income per share applicable to common stockholders
     (0.25
)
     (0.25
)
     (0.20
)
     (0.20
)
Basic undistributed net income per share applicable to common stockholders
   $ 1.77     $ 1.77     $ 1.75     $ 1.75  
Three Months Ended June 30,
 
2016
 
 
2015
 
Diluted EPS
 
Class A
 
 
Class B
 
 
Class A
 
 
Class B
 
Numerator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Distributed net income applicable to common stockholders
   $ 5,932     $ 441     $ 4,754     $ 512  
Reallocation of distributed net income as a result of conversion of dilutive stock options
     1       (1
)
     3       (3
)
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding
     440       —       509       —  
Diluted distributed net income applicable to common stockholders
   $ 6,373     $ 440     $ 5,266     $ 509  
                                 
Undistributed net income applicable to common stockholders
   $ 41,937     $ 3,118     $ 41,485     $ 4,472  
Reallocation of undistributed net income as a result of conversion of dilutive stock options
     9       (9
)
     28       (28
)
Reallocation of undistributed net income due to conversion of Class B to Class A
     3,109       —       4,444       —  
Diluted undistributed net income from continuing operations applicable to common stockholders
   $ 45,055     $ 3,109     $ 45,957     $ 4,444  
Denominator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of shares outstanding used to calculate basic net income per share
     23,700       1,762       23,770       2,562  
Weighted average number of shares from stock options
     72       —       164       —  
Conversion of Class B to Class A common shares outstanding
     1,762       —       2,562       —  
Weighted average number of shares outstanding used to calculate diluted net income per share
     25,534       1,762       26,496       2,562  
                                 
Earnings per Share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Diluted net income per share applicable to common stockholders
   $ 2.01     $ 2.01     $ 1.93     $ 1.93  
Diluted distributed net income per share applicable to common stockholders
     (0.25
)
     (0.25
)
     (0.20
)
     (0.20
)
Diluted undistributed net income per share applicable to common stockholders
   $ 1.76     $ 1.76     $ 1.73     $ 1.73  
Three Months Ended June 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       —  
Six Months Ended June 30,
 
2016
 
 
2015
 
Basic EPS
 
Class A
 
 
Class B
 
 
Class A
 
 
Class B
 
Numerator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income applicable to common stockholders
   $ 84,445     $ 7,253     $ 82,929     $ 8,947  
Distributed net income applicable to common stockholders
     (10,612
)
     (912
)
     (8,559
)
     (923
)
Basic undistributed net income applicable to common stockholders
   $ 73,833     $ 6,341     $ 74,370     $ 8,024  
                                 
Denominator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of shares outstanding used to calculate basic net income per share
     23,611       2,028       23,748       2,562  
                                 
Earnings per Share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic net income per share applicable to common stockholders
   $ 3.58     $ 3.58     $ 3.49     $ 3.49  
Basic distributed net income per share applicable to common stockholders
     (0.45
)
     (0.45
)
     (0.36
)
     (0.36
)
Basic undistributed net income per share applicable to common stockholders
   $ 3.13     $ 3.13     $ 3.13     $ 3.13  
Six Months Ended June 30,
 
2016
 
 
2015
 
Diluted EPS
 
Class A
 
 
Class B
 
 
Class A
 
 
Class B
 
Numerator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Distributed net income applicable to common stockholders
   $ 10,612     $ 912     $ 8,559     $ 923  
Reallocation of distributed net income as a result of conversion of dilutive stock options
     5       (5
)
     7       (7
)
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding
     907       —       916       —  
Diluted distributed net income applicable to common stockholders
   $ 11,524     $ 907     $ 9,482     $ 916  
                                 
Undistributed net income applicable to common stockholders
   $ 73,833     $ 6,341     $ 74,370     $ 8,024  
Reallocation of undistributed net income as a result of conversion of dilutive stock options
     28       (28
)
     61       (61
)
Reallocation of undistributed net income due to conversion of Class B to Class A
     6,313       —       7,963       —  
Diluted undistributed net income applicable to common stockholders
   $ 80,174     $ 6,313     $ 82,394     $ 7,963  
                                 
Denominator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of shares outstanding used to calculate basic net income per share
     23,611       2,028       23,748       2,562  
Weighted average number of shares from stock options
     115       —       199       —  
Conversion of Class B to Class A common shares outstanding
     2,028       —       2,562       —  
Weighted average number of shares outstanding used to calculate diluted net income per share
     25,754       2,028       26,509       2,562  
                                 
Earnings per Share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Diluted net income per share applicable to common stockholders
   $ 3.56     $ 3.56     $ 3.47     $ 3.47  
Diluted distributed net income per share applicable to common stockholders
     (0.45
)
     (0.45
)
     (0.36
)
     (0.36
)
Diluted undistributed net income per share applicable to common stockholders
   $ 3.11     $ 3.11     $ 3.11     $ 3.11  
Six Months Ended June 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
     10       —       16       —