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Stock Options, Stock Grants and New Stock Issues (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Activity in the Company’s Stock Option Plans | A summary of activity in the Company's stock option plans is as follows:
| Weighted Average Exercise Price |  | Options Outstanding |  | Weighted Average Contractual Term (in years) |  | Intrinsic Value of Options |  | Options Available
At January 01, 2016 | $ | 12.79 |  |  | 173,985 |  |  | 6.4 |  | $ | — |  |  | 152,028 |
Expired | $ | 16.01 |  |  | (937 | ) |  |  |  |  |  |  | 937 |
At December 31, 2016 | $ | 12.77 |  |  | 173,048 |  |  | 5.4 |  | $ | — |  |  | 152,965 |
Exercised | $ | 11.55 |  |  | (25,632 | ) |  |  |  | $ | 78,818 |  |  |  |
Expired | $ | 15.26 |  |  | (1,905 | ) |  |  |  |  |  |  | 1,905 |
At December 31, 2017 | $ | 12.96 |  |  | 145,511 |  |  | 4.6 |  | $ | 156,445 |  |  | 154,870 |
Exercised | $ | 12.09 |  |  | (85,440 | ) |  |  |  | $ | 842,742 |  |  |
Expired | $ | 16.01 |  |  | (975 | ) |  |  |  |  |  | 975 |
At December 31, 2018 | $ | 14.16 |  |  | 59,096 |  |  | 4.8 |  | $ | 143,737 |  |  | 155,845 |
Exercisable options | $ | 13.82 |  |  | 49,127 |  |  | 4.5 |  | $ | 136,123 |  |  |  |
Options expected to vest: |  |  |  |  |  |  |  |  | Grant Date Fair Value |  |  |
At December 31, 2016 | $ | 14.72 |  |  | 43,286 |  |  | 7.1 |  | $ | 6.24 |  |  |  |
Vested | $ | 14.35 |  |  | (17,574 | ) |  |  |  | $ | 5.96 |  |  |  |
Forfeited options | $ | 15.38 |  |  | (62 | ) |  |  |  |  |  |
At December 31, 2017 | $ | 14.72 |  |  | 25,650 |  |  | 6.5 |  | $ | 6.41 |  |  |  |
Vested | $ | 14.78 |  |  | (15,380 | ) |  |  |  | $ | 6.38 |  |  |
Forfeited options | $ | 16.01 |  |  | (301 | ) |  |  |  |  |  |
At December 31, 2018 | $ | 15.83 |  |  | 9,969 |  |  | 6.0 |  | $ | 6.44 |  |  |
Stock Options by Exercise Price Range | The following table summarizes information about stock options outstanding at December 31, 2018:
Range of Exercise Prices |  | Outstanding Stock Options |  | Exercisable Stock Options
| Shares |  | Weighted Average |  | Shares |  | Weighted Average Exercise Price
|  | Exercise Price |  | Remaining Contractual Life in Years |  |
$ | 11.35 |  |  | 13,402 |  |  | $ | 11.35 |  |  | 3.10 |  | 13,402 |  |  | $ | 11.35 |
$ | 13.70 |  |  | 15,933 |  |  | $ | 13.70 |  |  | 4.10 |  | 15,933 |  |  | $ | 13.70 |
$ | 14.76 |  |  | 8,109 |  |  | $ | 14.76 |  |  | 5.14 |  | 6,643 |  |  | $ | 14.76 |
$ | 16.01 |  |  | 21,652 |  |  | $ | 16.01 |  |  | 6.11 |  | 13,149 |  |  | $ | 16.01 |
|  |  | 59,096 |  |  |  |  |  |  |  | 49,127 |  |  |  |
Summary of Stock Awards Plan Activity | A summary of plan activity for the 2005 and 2015 Stock Awards Plans is as follows:
| Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2015 | 51,440 |  |  | $ | 15.57 |
Granted February 19, 2016 | 50,062 |  |  | $ | 7.51 |
Granted May 5, 2016 | 42,193 |  |  | $ | 8.05 |
Vested | (21,133 | ) |  | $ | 13.12 |
Forfeited | (1,260 | ) |  | $ | 17.73 |
Outstanding at December 31, 2016 | 121,302 |  |  | $ | 10.03 |
Granted February 8, 2017 | 44,687 |  |  | $ | 12.30 |
Vested | (34,322 | ) |  | $ | 10.45 |
Outstanding at December 31, 2017 | 131,667 |  |  | $ | 10.69 |
Granted February 7, 2018 | 65,527 |  |  | $ | 12.47 |
Vested | (51,775 | ) |  | $ | 10.84 |
Forfeited | (3,245 | ) |  | $ | 10.96 |
Outstanding at December 31, 2018 | 142,174 |  |  | $ | 11.45 |

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