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Note 6 - Stock-based Compensation (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
 
 
Year Ended December 31,
 
 
 
2015
 
 
2014
 
 
2013
 
Stock-based compensation expense, gross
  $ 4,019     $ 5,012     $ 1,974  
Income tax benefit at our statutory rate associated
with stock-based compensation
    (1,567 )     (1,955 )     (770 )
Stock-based compensation expense, net
  $ 2,452     $ 3,057     $ 1,204  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
 
 
Year Ended December 31,
 
 
 
2015
 
 
2014
 
 
2013
 
 
 
Number
of
Shares
 
 
Weighted-
Average
Grant Date
Fair Value
Per Share
 
 
Number
of
Shares
 
 
Weighted-
Average
Grant Date
Fair Value
Per Share
 
 
Number
of
Shares
 
 
Weighted-
Average
Grant Date
Fair Value
Per Share
 
                                                 
Restricted stock - common:
                                               
Outstanding - beginning
of period
    385,056     $ 9.09       274,838     $ 4.43       -     $ -  
Granted
    150,308       10.27       312,961       11.78       382,062       5.20  
Vested
    (197,858 )     9.16       (202,743 )     6.93       (107,224 )     7.16  
Outstanding - end of period
    337,506     $ 9.57       385,056     $ 9.09       274,838     $ 4.43  
 
 
Year Ended December 31,
 
 
 
2015
 
 
2014
 
 
2013
 
 
 
Number
of
Shares
 
 
Weighted-
Average
Grant Date
Fair Value
Per Share
 
 
Number
of
Shares
 
 
Weighted-
Average
Grant Date
Fair Value
Per Share
 
 
Number
of
Shares
 
 
Weighted-
Average
Grant Date
Fair Value
Per Share
 
                                                 
Restricted stock - Class A common:
                                               
Outstanding - beginning
of period
    204,473     $ 9.81       -     $ -       -     $ -  
Granted
    287,513       9.37       236,294       9.80       -       -  
Vested
    (117,293 )     9.85       (31,821 )     9.75       -       -  
Outstanding - end of period
    374,693     $ 9.46       204,473     $ 9.81       -     $ -  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Year Ended December 31,
 
 
 
2015
 
 
2014
 
 
2013
 
 
 
Number of
Shares
Underlying
Options
 
 
Weighted
Average
Exercise
Price
 
 
Number of
Shares
Underlying
Options
 
 
Weighted
Average
Exercise
Price
 
 
Number of
Shares
Underlying
Options
 
 
Weighted
Average
Exercise
Price
 
Common stock:
                                               
Options outstanding -
beginning of period
    274,746     $ 1.99       274,746     $ 1.99       1,316,068     $ 5.98  
Options granted
    -       -       -       -       -       -  
Options exercised
    -       -       -       -       (119,822 )     2.34  
Options forfeited
    -       -       -       -       -       -  
Options expired
    -       -       -       -       (921,500 )     7.64  
Options outstanding -
end of period
    274,746     $ 1.99       274,746     $ 1.99       274,746     $ 1.99  
                                                 
Options exercisable at
end of period
    206,064     $ 1.99       137,376     $ 1.99       68,688     $ 1.99