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Note 11 - Net Income Per Share of Class A and Class B Common Stock (Tables)
 3 Months Ended
Mar. 31, 2013
Schedule of Earnings Per Share Reconciliation [Table Text Block]
Three Months Ended March 31,
 
2013
   
2012
 
Basic EPS from Continuing Operations
 
Class A
   
Class B
   
Class A
   
Class B
 
Numerator:
                       
Income from continuing operations applicable to common stockholders
  $ 19,525     $ 2,357     $ 14,235     $ 2,399  
Distributed income applicable to common stockholders
    -       -       (1,552 )     (262 )
Basic undistributed income from continuing operations applicable to common stockholders
  $ 19,525     $ 2,357     $ 12,683     $ 2,137  
                                 
Denominator:
                               
Weighted average number of shares outstanding used to calculate basic income per share
    22,866       2,760       22,238       3,748  
                                 
Basic income per share from continuing operations applicable to common stockholders
  $ 0.85     $ 0.85     $ 0.64     $ 0.64  
Basic distributed income per share from continuing operations applicable to common stockholders
    -       -       (0.07 )     (0.07 )
Basic undistributed income per share from continuing operations applicable to common stockholders
  $ 0.85     $ 0.85     $ 0.57     $ 0.57  
Three Months Ended March 31,
 
2013
   
2012
 
Diluted EPS from Continuing Operations
 
Class A
   
Class B
   
Class A
   
Class B
 
Numerator:
                       
Distributed income applicable to common stockholders
  $ -     $ -     $ 1,552     $ 262  
Reallocation of distributed income as a result of conversion of dilutive stock options
    -       -       5       (5 )
Reallocation of distributed income due to conversion of Class B to Class A common shares outstanding
    -       -       257       -  
Diluted distributed income applicable to common stockholders
  $ -     $ -     $ 1,814     $ 257  
Undistributed income from continuing operations applicable to common stockholders
  $ 19,525     $ 2,357     $ 12,683     $ 2,137  
Reallocation of undistributed income as a result of conversion of dilutive stock options
    39       (39 )     39       (39 )
Reallocation of undistributed income due to conversion of Class B to Class A
    2,318       -       2,098       -  
Diluted undistributed income from continuing operations applicable to common stockholders
  $ 21,882     $ 2,318     $ 14,820     $ 2,098  
                                 
Denominator:
                               
Weighted average number of shares outstanding used to calculate basic income per share from continuing operations
    22,866       2,760       22,238       3,748  
Weighted average number of shares from stock options
    428       -       492       -  
Conversion of Class B to Class A common shares outstanding
    2,760       -       3,748       -  
Weighted average number of shares outstanding used to calculate diluted income per share from continuing operations
    26,054       2,760       26,478       3,748  
                                 
Diluted income per share from continuing operations applicable to common stockholders
  $ 0.84     $ 0.84     $ 0.63     $ 0.63  
Diluted distributed income per share from continuing operations applicable to common stockholders
    -       -       (0.07 )     (0.07 )
Diluted undistributed income per share from continuing operations applicable to common stockholders
  $ 0.84     $ 0.84     $ 0.56     $ 0.56  
Three Months Ended March 31,
 
2013
   
2012
 
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         -       90         -