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Stock Based Compensation (Tables)
6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

Activity under the Company’s option plans as of and for the three months ended June 30, 2018 was as follows:

Weighted-
Average
Weighted- Remaining
Average Contractual
Exercise Term Aggregate
      Shares       Price       (In Years)       Intrinsic Value
Outstanding at December 31, 2017 299,778 $           6.18
Granted
Exercised (46,497 ) 5.42
Forfeited/cancelled/expired (1,323 ) 14.24
Outstanding at June 30, 2018      251,958 6.28 1.7 $ 4,690,971
 
Exercisable at June 30, 2018 249,751 6.21 1.6 $ 4,667,445
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

Activity under the Company’s restricted shares as of and for the six months ended June 30, 2018 was as follows:

Weighted-
Average
Nonvested Grant Date
      Shares       Fair Value
Nonvested at December 31, 2017 103,078 $        20.41
Granted 23,018 28.08
Vested         (58,002 ) 20.33
Forfeited/cancelled/expired (666 ) 24.25
Nonvested at June 30, 2018 67,428 23.07
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, 2017        151,194 $                  19.19
Awarded 19,614 31.35
Change in Estimate (20,595 )
Vested (69,627 ) 19.46
Unearned at June 30, 2018 80,586 151,772 22.53
Schedule of Unearned Restricted Unit Awards [Table Text Block]

A summary of the status of unearned restricted share units and the change during the period is presented in the table below:

Weighted
Average Grant
Units Date Fair
       (expected)        Value
Unearned at December 31, 2017 - $                 -
Awarded           29,423 31.35
Forfeited - -
Vested - -
Unearned at June 30, 2018 29,423 $ 31.35