Stock-Based Compensation (Tables)
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12 Months Ended |
Dec. 31, 2018 |
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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| Share-based Compensation, Stock Options, Activity |
Information with respect to options outstanding during the years ended December 31, 2018 and 2017 is as follows: | | | | | | | | | | | | | | | | Stock Options Outstanding | | | | | | | | | | | 2018 | | 2017 | | | Shares | | Weighted Average Exercise Price | | Shares | | Weighted Average Exercise Price | Outstanding at beginning of year | | 1,363,444 |
| | $ | 8.01 |
| | 1,599,976 |
| | $ | 6.36 |
| Add: Granted | | 373,750 |
| | 11.44 |
| | 260,600 |
| | 12.38 |
| Less: Exercised | | (230,894 | ) | | 5.67 |
| | (358,332 | ) | | 4.65 |
| Less: Retired on exercise | | (37,240 | ) | | 5.07 |
| | — |
| | — |
| Less: Expired/cancelled/forfeited | | (37,200 | ) | | 7.34 |
| | (138,800 | ) | | 5.87 |
| Outstanding at end of year | | 1,431,860 |
| | $ | 9.38 |
| | 1,363,444 |
| | $ | 8.01 |
| Exercisable at end of year | | 643,610 |
| | $ | 7.78 |
| | 644,472 |
| | $ | 6.47 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable |
A summary of information about stock options outstanding is as follows: | | | | | | | | | | | | | | | | | Stock Option Summary | | | | | | | | | | | Weighted Average Exercise Price | | Average Remaining Life (years) | | Outstanding Shares | | Exercisable Shares | December 31, 2018 | | | | | | | | | | | $ | 6.63 |
| | 1.0 |
| | 283,886 |
| | 268,886 |
| | | 7.50 |
| | 2.0 |
| | 297,348 |
| | 207,898 |
| | | 8.50 |
| | 3.0 |
| | 222,276 |
| | 103,176 |
| | | 11.38 |
| | 5.0 |
| | 354,750 |
| | — |
| | | 12.38 |
| | 4.0 |
| | 266,600 |
| | 63,650 |
| | | 12.80 |
| | 4.8 |
| | 7,000 |
| | — |
| Total outstanding options | | 9.38 |
| | 3.1 |
| | 1,431,860 |
| | 643,610 |
| Intrinsic value on December 31, 2018 | | | | | | $ | 3,178,491 |
| | $ | 2,399,743 |
| | | | | | |
| | | December 31, 2017 | | | | | | | | | | | $ | 5.00 |
| | 1.0 |
| | 211,952 |
| | 211,952 |
| | | 6.63 |
| | 2.0 |
| | 323,792 |
| | 218,868 |
| | | 7.50 |
| | 3.0 |
| | 328,900 |
| | 154,100 |
| | | 8.50 |
| | 4.0 |
| | 238,200 |
| | 59,552 |
| | | 12.38 |
| | 5.0 |
| | 260,600 |
| | — |
| Total outstanding options | | 8.01 |
| | 2.6 |
| | 1,363,444 |
| | 644,472 |
| Intrinsic value on December 31, 2017 | | $ | 5,951,363 |
| | $ | 4,271,277 |
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| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions |
The weighted average fair value of options granted during 2018 and 2017 were estimated using the Black-Scholes option-pricing model with the following weighted average assumptions: | | | | | | Stock Option Pricing Assumptions | | | | | | | 2018 | | 2017 | Dividend yield | | 0.00% | | 0.00% | Risk free interest rate | | 2.53% | | 2.20% | Expected volatility | | 18.94% | | 18.94% | Expected life in years | | 5 | | 5 |
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| Schedule of Share-based Compensation, Restricted Stock Units Award Activity |
Nonvested restricted stock for the years ended December 31, 2018 and 2017 is summarized in the following table. | | | | | | | | | | | | | | | | Restricted Stock Summary | | | | | | | | | | | 2018 | | 2017 | | | Shares | | Weighted Average Grant-Date Fair Value | | Shares | | Weighted Average Grant-Date Fair Value | Nonvested at beginning of year | | 42,000 |
| | $ | 8.66 |
| | 52,000 |
| | $ | 7.45 |
| Add: Granted | | 12,000 |
| | 12.38 |
| | 10,000 |
| | 12.38 |
| Less: Vested | | (16,000 | ) | | 7.50 |
| | (16,000 | ) | | 7.50 |
| Less: Forfeited | | — |
| | — |
| | (4,000 | ) | | 6.88 |
| Nonvested at end of year | | 38,000 |
| | $ | 10.32 |
| | 42,000 |
| | $ | 8.66 |
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| Share Based Compensation, Restricted Stock, Vesting Schedule |
The vesting schedule of restricted shares as of December 31, 2018 is as follows: | | | | | Restricted Stock Vesting Schedule | | | Year | | Shares | 2019 | | 18,500 |
| 2020 | | 5,500 |
| 2021 | | 5,500 |
| 2022 | | 5,500 |
| 2023 | | 3,000 |
| | | 38,000 |
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