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Note 6 - Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
 
 
Three Months Ended
 
 
Six Months Ended
 
 
 
June 30,
 
 
June 30,
 
 
 
2016
 
 
2015
 
 
2016
 
 
2015
 
Share-based compensation expense, gross
  $ 1,270     $ 1,009     $ 2,556     $ 2,002  
Income tax benefit at our statutory rate associated
with share-based compensation
    (495 )     (394 )     (997 )     (781 )
Share-based compensation expense, net
  $ 775     $ 615     $ 1,559     $ 1,221  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
 
 
Six Months Ended
 
 
 
June 30, 2016
 
 
June 30, 2015
 
 
 
 
 
 
 
Weighted-
 
 
 
 
 
 
Weighted-
 
 
 
 
 
 
 
average
 
 
 
 
 
 
average
 
 
 
 
 
 
 
Grant Date
 
 
 
 
 
 
Grant Date
 
 
 
Number of
 
 
Fair Value
 
 
Number of
 
 
Fair Value
 
 
 
Shares
 
 
Per Share
 
 
Shares
 
 
Per Share
 
Restricted stock - common:
                               
Outstanding - beginning of period
    337,506     $ 9.57       385,056     $ 9.09  
Granted
    237,500     $ 12.88       150,308     $ 10.27  
Vested
    (178,973 )   $ 8.46       (197,858 )   $ 9.16  
Outstanding - end of period
    396,033     $ 12.06       337,506     $ 9.57  
 
 
Six Months Ended
 
 
 
June 30, 2016
 
 
June 30, 2015
 
 
 
 
 
 
 
Weighted-average
 
 
 
 
 
 
Weighted-average
 
 
 
 
 
 
 
Grant Date
 
 
 
 
 
 
Grant Date
 
 
 
Number of
 
 
Fair Value
 
 
Number of
 
 
Fair Value
 
 
 
Shares
 
 
Per Share
 
 
Shares
 
 
Per Share
 
Restricted stock - class A common:
                               
Restricted stock - beginning of period
    374,693     $ 9.46       204,473     $ 9.81  
Granted
    218,612     $ 11.25       287,513     $ 9.37  
Vested
    (178,223 )   $ 10.04       (117,293 )   $ 9.85  
Restricted stock - end of period
    415,082     $ 10.15       374,693     $ 9.46  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Six Months Ended
 
 
 
June 30, 2016
 
 
June 30, 2015
 
 
 
Number of
Shares
Underlying
Options
 
 
Weighted-
Average
Exercise
Price
 
 
Number of
Shares
Underlying
Options
 
 
Weighted-
Average
Exercise
Price
 
Stock options - common:
                               
Outstanding - beginning of period
    274,746     $ 1.99       274,746     $ 1.99  
Options exercised
    -     $ -       -     $ -  
Options expired
    -     $ -       -     $ -  
Options outstanding - end of period
    274,746     $ 1.99       274,746     $ 1.99  
                                 
Exercisable at end of period
    274,476     $ 1.99       206,064     $ 1.99