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Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
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 for the six months ended June 30, 2020 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, 2019 | 73,426 |  |  | $ | 8.19 |  |  |  |  |  |
Granted | - |  |  |  | - |  |  |  |  |  |
Exercised | (25,413 | ) |  |  | 7.39 |  |  |  |  |  |
Forfeited/cancelled/expired | - |  |  |  | - |  |  |  |  |  |
Outstanding at June 30, 2020 | 48,013 |  |  | $ | 8.61 |  | 1.7 |  | $ | 360,793 |
Exercisable at June 30, 2020 | 48,013 |  |  | $ | 8.61 |  | 1.7 |  | $ | 360,793 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | Activity under the Company’s restricted shares for the six months ended June 30, 2020 was as follows:
|  |  |  | Weighted-
|  |  |  | Average
|  | Nonvested |  | Grant Date
|  | Shares |  | Fair Value
Nonvested at December 31, 2019 |  | 75,351 |  |  | $ | 21.61
Granted |  | 68,853 |  |  |  | 17.42
Vested |  | (47,198 | ) |  |  | 21.41
Forfeited/cancelled/expired |  | - |  |  |  | -
Nonvested June 30, 2020 |  | 97,006 |  |  | $ | 18.73
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, 2019 |  | 90,097 |  |  |  |  | $ | 23.85 |
Awarded |  | 82,579 |  |  |  |  |  | 10.77 |
Change in estimate |  | 2,490 |  |  |  |  |  | 22.75 |
Vested shares |  | (37,337 | ) |  |  |  |  | 22.75 |
Unearned at June 30, 2020 |  | 137,829 |  |  | 206,744 |  | $ | 16.29 |
Schedule of Unearned Restricted Unit Awards [Table Text Block] | A summary of the status of unearned restricted stock units and the changes 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, 2019 |  | 73,069 |  |  | $ | 23.62 |
Awarded |  | 123,870 |  |  |  | 10.77 |
Vested shares |  | (27,626 | ) |  |  | 24.53 |
Unearned at June 30, 2020 |  | 169,313 |  |  | $ | 14.07 |

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