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Note 10 - Net Income Per Share of Class A and Class B Common Stock (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Three Months Ended June 30,

  

2015

    

2014

  

Basic EPS from Continuing Operations

  

Class A

    

Class B

    

Class A

    

Class B

  

Numerator:

                                

Income from continuing operations applicable to common stockholders

   $ 46,239     $ 4,984     $ 31,720     $ 3,450  

Distributed income applicable to common stockholders

     (4,754 )     (512 )     (3,769 )     (410 )

Basic undistributed income from continuing operations applicable to common stockholders

   $ 41,485     $ 4,472     $ 27,951     $ 3,040  
                                 

Denominator:

                                

Weighted average number of shares outstanding used to calculate basic income per share

    23,770       2,562       23,557       2,562  
                                 

Basic income per share from continuing operations applicable to common stockholders

   $ 1.95     $ 1.95     $ 1.35     $ 1.35  

Basic distributed income per share from continuing operations applicable to common stockholders

     (0.20 )     (0.20 )     (0.16 )     (0.16 )

Basic undistributed income per share from continuing operations applicable to common stockholders

   $ 1.75     $ 1.75     $ 1.19     $ 1.19  

Three Months Ended June 30,

  

2015

    

2014

  

Diluted EPS from Continuing Operations

  

Class A

    

Class B

    

Class A

    

Class B

  

Numerator:

                                

Distributed income applicable to common stockholders

   $ 4,754     $ 512     $ 3,769     $ 410  

Reallocation of distributed income as a result of conversion of dilutive stock options

     3       (3 )     3       (3 )

Reallocation of distributed income due to conversion of Class B to Class A common shares outstanding

     509       -       407       -  

Diluted distributed income applicable to common stockholders

   $ 5,266     $ 509     $ 4,179     $ 407  

Undistributed income from continuing operations applicable to common stockholders

   $ 41,485     $ 4,472     $ 27,951     $ 3,040  

Reallocation of undistributed income as a result of conversion of dilutive stock options

     28       (28 )     25       (25 )

Reallocation of undistributed income due to conversion of Class B to Class A

     4,444       -       3,015       -  

Diluted undistributed income from continuing operations applicable to common stockholders

   $ 45,957     $ 4,444     $ 30,991     $ 3,015  
                                 

Denominator:

                                

Weighted average number of shares outstanding used to calculate basic income per share from continuing operations

     23,770       2,562       23,557       2,562  

Weighted average number of shares from stock options

    164       -       212       -  

Conversion of Class B to Class A common shares outstanding

     2,562       -       2,562       -  

Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations

    26,496       2,562       26,331       2,562  
                                 

Diluted income per share from continuing operations applicable to common stockholders

   $ 1.93     $ 1.93     $ 1.34     $ 1.34  

Diluted distributed income per share from continuing operations applicable to common stockholders

     (0.20 )     (0.20 )     (0.16 )     (0.16 )

Diluted undistributed income per share from continuing operations applicable to common stockholders

   $ 1.73     $ 1.73     $ 1.18     $ 1.18  

Three Months Ended June 30,

  

2015

    

2014

  

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       -       12       -  

Six Months Ended June 30,

  

2015

    

2014

  

Basic EPS from Continuing Operations

  

Class A

    

Class B

    

Class A

    

Class B

  

Numerator:

                                

Income from continuing operations applicable to common stockholders

   $ 82,929     $ 8,947     $ 53,976     $ 5,888  

Distributed income applicable to common stockholders

     (8,559 )     (923 )     (6,814 )     (743 )

Basic undistributed income from continuing operations applicable to common stockholders

   $ 74,370     $ 8,024     $ 47,162     $ 5,145  
                                 

Denominator:

                                

Weighted average number of shares outstanding used to calculate basic income per share

    23,748       2,562       23,485       2,562  
                                 

Basic income per share from continuing operations applicable to common stockholders

   $ 3.49     $ 3.49     $ 2.30     $ 2.30  

Basic distributed income per share from continuing operations applicable to common stockholders

     (0.36 )     (0.36 )     (0.29 )     (0.29 )

Basic undistributed income per share from continuing operations applicable to common stockholders

   $ 3.13     $ 3.13     $ 2.01     $ 2.01  

Six Months Ended June 30,

  

2015

    

2014

  

Diluted EPS from Continuing Operations

  

Class A

    

Class B

    

Class A

    

Class B

  

Numerator:

                                

Distributed income applicable to common stockholders

   $ 8,559     $ 923     $ 6,814     $ 743  

Reallocation of distributed income as a result of conversion of dilutive stock options

     7       (7 )     8       (8 )

Reallocation of distributed income due to conversion of Class B to Class A common shares outstanding

     916       -       735       -  

Diluted distributed income applicable to common stockholders

   $ 9,482     $ 916     $ 7,557     $ 735  

Undistributed income from continuing operations applicable to common stockholders

   $ 74,370     $ 8,024     $ 47,162     $ 5,145  

Reallocation of undistributed income as a result of conversion of dilutive stock options

     61       (61 )     55       (55 )

Reallocation of undistributed income due to conversion of Class B to Class A

     7,963       -       5,090       -  

Diluted undistributed income from continuing operations applicable to common stockholders

   $ 82,394     $ 7,963     $ 52,307     $ 5,090  
                                 

Denominator:

                                

Weighted average number of shares outstanding used to calculate basic income per share from continuing operations

     23,748       2,562       23,485       2,562  

Weighted average number of shares from stock options

    199       -       279       -  

Conversion of Class B to Class A common shares outstanding

     2,562       -       2,562       -  

Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations

    26,509       2,562       26,326       2,562  
                                 

Diluted income per share from continuing operations applicable to common stockholders

   $ 3.47     $ 3.47     $ 2.27     $ 2.27  

Diluted distributed income per share from continuing operations applicable to common stockholders

     (0.36 )     (0.36 )     (0.29 )     (0.29 )

Diluted undistributed income per share from continuing operations applicable to common stockholders

   $ 3.11     $ 3.11     $ 1.98     $ 1.98  

Six Months Ended June 30,

  

2015

    

2014

  

Diluted EPS

  

Class A

    

Class B

    

Class A

    

Class B

  

Antidilutive Securities

                                

Shares issuable pursuant to stock options not included since they were antidilutive

     16       -       14       -