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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Option activity under the Company’s option plans as of and for the six months ended June 30, 2017 were as follows:

Weighted-
Average
  Weighted- Remaining
Average Contractual  
  Exercise Term Aggregate
       Shares       Price       (In Years)       Intrinsic Value
Outstanding at December 31, 2016 358,367 $     6.26
Granted   - -  
Exercised (10,846 ) 13.44
Forfeited/cancelled/expired - -  
Outstanding at June 30, 2017 347,521   $ 6.11 2.20   $     5,711,643
Exercisable at June 30, 2017      343,991 $ 6.03 2.16 $ 5,682,309
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

The below table represents information regarding restricted shares currently outstanding at June 30, 2017:

Weighted-
Average
Nonvested Grant Date
Shares       Fair Value
Nonvested at December 31, 2016       111,273 $     16.81
Granted 56,164   23.82
Vested (65,359 ) 16.46
Forfeited/cancelled/expired - -
Nonvested at June 30, 2017 102,078 $ 20.41
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
Units Units Date Fair
      (expected)         (maximum)       Value
Unearned at December 31, 2016        151,572 189,455 $ 18.47
Awarded   24,891 37,336   22.75
Forfeited -   - -
Adjustments (25,269 ) - 18.47
Unearned at June 30, 2017 151,194 226,791 $ 19.19