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Stock Based Compensation (Tables)
6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

Option activity under the principal option plans as of June 30, 2016 and changes during the six months ended June 30, 2016 were as follows:

 

                Weighted-      
                Average      
          Weighted-   Remaining      
          Average   Contractual      
          Exercise   Term   Aggregate
    Shares   Price   (In Years)   Intrinsic Value
Outstanding at December 31, 2015   535,906     $     6.48          
Granted   -       -          
Exercised   (38,735 )     6.32          
Forfeited/cancelled/expired   (45,010 )     10.59          
Outstanding at June 30, 2016   452,161     $ 6.09   2.81   $     4,341,277
Exercisable at June 30, 2016        448,631     $ 6.02   2.77   $ 4,336,158
Schedule of Share Based Compensation Stock Option Plan Table Text Block

Information related to stock option exercises during 2016:

 

  2016
Intrinsic value of options exercised $      398,890
Cash received from options exercised   244,625
Tax benefit realized from options exercised   53,631
Weighted average fair value of options granted   n/a
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

The below table represents information regarding restricted shares currently outstanding at June 30, 2016:

 

        Weighted-
        Average
  Nonvested   Grant Date
  Shares   Fair Value
Nonvested at December 31, 2015 96,902     $     16.81
Granted 72,920       15.88
Vested (55,648 )     16.01
Forfeited/cancelled/expired (1,000 )     19.58
Nonvested at June 30, 2016       113,174     $ 16.81
Schedule of Unearned Performance Unit Awards [Table Text Block]

A summary of the status of unearned performance unit awards and the change during the period is presented in the table below:

        Weighted-
        Average
        Grant Date
  Shares   Fair Value
Unearned at December 31, 2015 87,038     $     19.46
Awarded 52,713       17.15
 
Forfeited (7,447 )     19.46
Expired -       -
Unearned at June 30, 2016      132,304     $ 18.60