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Note 8 - Net Income Per Share of Class A and Class B Common Stock (Tables)
 3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Three Months Ended March 31,
 
2016
 
 
2015
 
Basic EPS
 
Class A
 
 
Class B
 
 
Class A
 
 
Class B
 
Numerator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income applicable to common stockholders
   $ 36,692     $ 3,578     $ 36,690     $ 3,963  
Distributed net income applicable to common stockholders
     (4,693
)
     (458
)
     (3,805
)
     (411
)
Basic undistributed net income applicable to common stockholders
   $ 31,999     $ 3,120     $ 32,885     $ 3,552  
                                 
Denominator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of shares outstanding used to calculate basic net income per share
     23,522       2,294       23,721       2,562  
                                 
Earnings per Share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic net income per share applicable to common stockholders
   $ 1.56     $ 1.56     $ 1.55     $ 1.55  
Basic distributed net income per share applicable to common stockholders
     (0.20
)
     (0.20
)
     (0.16
)
     (0.16
)
Basic undistributed net income per share applicable to common stockholders
   $ 1.36     $ 1.36     $ 1.39     $ 1.39  
Three Months Ended March 31,
 
2016
 
 
2015
 
Diluted EPS
 
Class A
 
 
Class B
 
 
Class A
 
 
Class B
 
Numerator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Distributed net income applicable to common stockholders
   $ 4,693     $ 458     $ 3,805     $ 411  
Reallocation of distributed net income as a result of conversion of dilutive stock options
     3       (3
)
     4       (4
)
Reallocation of distributed net income due to conversion of Class B to Class A common shares outstanding
     455       —       407       —  
Diluted distributed net income applicable to common stockholders
   $ 5,151     $ 455     $ 4,216     $ 407  
                                 
Undistributed net income applicable to common stockholders
   $ 31,999     $ 3,120     $ 32,885     $ 3,552  
Reallocation of undistributed net income as a result of conversion of dilutive stock options
     18       (18
)
     32       (32
)
Reallocation of undistributed net income due to conversion of Class B to Class A
     3,102       —       3,520       —  
Diluted undistributed net income applicable to common stockholders
   $ 35,119     $ 3,102     $ 36,437     $ 3,520  
                                 
Denominator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average number of shares outstanding used to calculate basic net income per share
     23,522       2,294       23,721       2,562  
Weighted average number of shares from stock options
     157       —       236       —  
Conversion of Class B to Class A common shares outstanding
     2,294       —       2,562       —  
Weighted average number of shares outstanding used to calculate diluted net income per share
     25,973       2,294       26,519       2,562  
                                 
Earnings per Share:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Diluted net income per share applicable to common stockholders
   $ 1.55     $ 1.55     $ 1.53     $ 1.53  
Diluted distributed net income per share applicable to common stockholders
     (0.20
)
     (0.20
)
     (0.16
)
     (0.16
)
Diluted undistributed net income per share applicable to common stockholders
   $ 1.35     $ 1.35     $ 1.37     $ 1.37  
Three Months Ended March 31,
 
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
     20       —       15       —