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Stock Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2021
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 three months ended March 31, 2021 was as follows:
| Number of Stock Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value |
Outstanding as of December 31, 2020 | 38,013 |  |  | $ | 9.03 |  |  |  |  |  |
Granted | - |  |  |  | - |  |  |  |  |  |
Exercised | (5,449 | ) |  |  | 8.34 |  |  |  |  |  |
Forfeited/cancelled/expired | - |  |  |  | - |  |  |  |  |  |
Outstanding as of March 31, 2021 | 32,564 |  |  |  | 9.15 |  | 1.21 |  | $ | 527,672 |
Exercisable as of March 31, 2021 | 32,564 |  |  | $ | 9.15 |  | 1.21 |  | $ | 527,672 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | Activity under the Company’s restricted shares for the three months ended March 31, 2021 was as follows:
|  |  |  | Weighted-
|  |  |  | Average
|  | Nonvested |  | Grant Date
|  | Shares |  | Fair Value
Nonvested as of December 31, 2020 |  | 113,114 |  |  | $ | 18.15
Granted |  | 27,147 |  |  |  | 23.23
Vested |  | (15,157 | ) |  |  | 24.36
Forfeited/cancelled/expired |  | (378 | ) |  |  | 23.23
Nonvested March 31, 2021 |  | 124,726 |  |  | $ | 18.49
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 as of December 31, 2020 |  | 147,636 |  |  |  |  | $ | 17.29 |
Awarded |  | 35,593 |  |  |  |  |  | 25.24 |
Change in estimate |  | 17,818 |  |  |  |  |  | 20.79 |
Vested shares |  | (29,421 | ) |  |  |  |  | 31.35 |
Unearned as of March 31, 2021 |  | 171,626 |  |  | 230,712 |  | $ | 16.89 |
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 as of December 31, 2020 |  | 169,313 |  |  | $ | 14.07 |
Awarded |  | 43,077 |  |  |  | 25.24 |
Vested shares |  | (68,916 | ) |  |  | 16.29 |
Unearned as of March 31, 2021 |  | 143,474 |  |  | $ | 16.36 |

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