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Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | Activity under the Company’s options as of and for the six months ended June 30, 2019 was as follows:
|  | Number of Stock Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2018 |  | 108,463 |  |  | $ | 8.35 |  |  |  |  |
Granted |  | - |  |  |  | - |  |  |  |  |
Exercised |  | (28,937 | ) |  |  | 8.96 |  |  |  |  |
Forfeited/cancelled/expired |  | - |  |  |  | - |  |  |  |  |
Outstanding at June 30, 2019 |  | 79,526 |  |  |  | 8.13 |  | 2.6 |  | $ | 1,155,895
Exercisable at June 30, 2019 |  | 79,526 |  |  | $ | 8.13 |  | 2.6 |  | $ | 1,155,895
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | Activity under the Company’s restricted shares for the six months ended June 30, 2019 was as follows:
|  |  |  |  | Weighted-
|  |  |  |  | Average
|  | Nonvested |  | Grant Date
|  | Shares |  | Fair Value
Nonvested at December 31, 2018 |  | 68,428 |  |  | $ | 23.04
Granted |  | 171,488 |  |  |  | 20.70
Vested |  | (52,629 | ) |  |  | 21.98
Forfeited/cancelled/expired |  | - |  |  |  | -
Nonvested June 30, 2019 |  | 187,287 |  |  | $ | 21.20
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, 2018 |  | 86,009 |  |  |  |  | $ | 22.06
Awarded |  | 35,636 |  |  |  |  |  | 20.79
Change in estimate |  | 23,375 |  |  |  |  |  | 30.95
Vested |  | (52,508 | ) |  |  |  |  | 21.26
Unearned at June 30, 2019 |  | 92,512 |  |  | 120,212 |  | $ | 24.27
Schedule of Unearned Restricted Unit Awards [Table Text Block] | A summary of the status of unearned restricted stock units and the change in restricted stock units during the period is presented in the table below:
|  |  |  |  | Weighted
|  |  |  |  | Average Grant
|  | Units |  | Date Fair
|  | (expected) |  | Value
Unearned at December 31, 2018 |  | 29,423 |  |  | $ | 31.35
Awarded |  | 53,454 |  |  |  | 20.79
Vested |  | (9,808 | ) |  |  | 21.28
Unearned at June 30, 2019 |  | 73,069 |  |  | $ | 24.98

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