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Stock Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Activity [Table Text Block] | The weighted average grant date fair value of all stock options granted during the nine months ended September 30, 2015 was $12.31. This was determined using the Black-Scholes option-pricing model with the following weighted-average assumptions:
Dividend yield |  | 0.0 | %
Expected life |  | 10 Years |
Expected volatility |  | 81.7 | %
Risk-free interest |  |  |
rate |  | 1.54 | %
Officer and Employee Plans [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Activity [Table Text Block] | A summary of the status of these stock option plans is presented in the following table:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
|  |  |  |  | Exercisable |
|  | Number |  | Price |
Outstanding at December 31, 2014 |  |  | 483,629 |  | $ | 10.20 |
Granted |  |  | 52,689 |  |  | 15.05 |
Exercised |  |  | (13,542) |  |  | 9.89 |
Forfeited |  |  | (2,139) |  |  | 11.94 |
Share conversion |  |  | 23,468 |  |  | 9.71 |
Retained by Cornerstone shareholders in merger |  |  | 285,209 |  |  | 11.22 |
Outstanding at September 30, 2015 |  |  | 829,314 |  | $ | 10.57 |
Board Of Directors Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Activity [Table Text Block] | Information pertaining to options outstanding at September 30, 2015, is as follows:
|  |  | Options Outstanding |  | Options Exercisable |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Average |  | Weighted- |  |  |  |  | Weighted- |
|  |  | Number |  | Remaining |  | Average |  | Number |  | Average |
|  |  | Outstanding |  | Contractual |  | Exercise |  | Exercisable |  | Exercise |
Exercise Prices |  | at 9/30/2015 |  | Life |  | Price |  | at 9/30/2015 |  | Price |
$ | 4.08 |  |  | 1,250 |  | 6.1 years |  | $ | 4.08 |  |  | 1,250 |  | $ | 4.08 |
| 4.40 |  |  | 1,250 |  | 5.9 years |  |  | 4.40 |  |  | 1,250 |  |  | 4.40 |
| 6.20 |  |  | 750 |  | 5.5 years |  |  | 4.40 |  |  | 750 |  |  | 6.20 |
| 6.60 |  |  | 64,800 |  | 6.5 years |  |  | 6.60 |  |  | 64,800 |  |  | 6.60 |
| 6.80 |  |  | 40,500 |  | 5.4 years |  |  | 6.80 |  |  | 40,500 |  |  | 6.80 |
| 9.48 |  |  | 58,350 |  | 7.5 years |  |  | 9.48 |  |  | 58,350 |  |  | 9.48 |
| 9.52 |  |  | 407,400 |  | 1.7 years |  |  | 9.52 |  |  | 407,400 |  |  | 9.52 |
| 9.60 |  |  | 71,250 |  | 8.4 years |  |  | 9.60 |  |  | 71,250 |  |  | 9.60 |
| 10.00 |  |  | 1,250 |  | 7.8 years |  |  | 10.00 |  |  | 1,250 |  |  | 10.00 |
| 10.48 |  |  | 79,220 |  | 4.7 years |  |  | 10.48 |  |  | 79,220 |  |  | 10.48 |
| 11.67 |  |  | 5,250 |  | 5.3 years |  |  | 11.67 |  |  | 4,200 |  |  | 11.67 |
| 14.29 |  |  | 1,050 |  | 2.8 years |  |  | 14.29 |  |  | 1,050 |  |  | 14.29 |
| 14.40 |  |  | 22,005 |  | 3.4 years |  |  | 14.40 |  |  | 22,005 |  |  | 14.40 |
| 15.05 |  |  | 52,689 |  | 10.0 years |  |  | 15.05 |  |  | - |  |  | 15.05 |
| 31.96 |  |  | 14,454 |  | 2.4 years |  |  | 31.96 |  |  | 14,454 |  |  | 31.96 |
| 53.00 |  |  | 4,200 |  | 0.4 years |  |  | 53.00 |  |  | 4,200 |  |  | 53.00 |
| 60.80 |  |  | 688 |  | 1.6 years |  |  | 60.80 |  |  | 688 |  |  | 60.80 |
| 61.00 |  |  | 2,958 |  | 1.4 years |  |  | 61.00 |  |  | 2,958 |  |  | 61.00 |
| Outstanding, end of year |  |  | 829,314 |  | 2.4 years |  |  | 10.57 |  |  | 775,575 |  |  | 10.27 |
Information related to non-vested options for the period ended September 30, 2015, is as follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
|  |  |  |  | Grant-Date |
|  | Number |  | Fair Value |
Nonvested at December 31, 2014 |  |  | 7,358 |  | $ | 2.16 |
Granted |  |  | 52,689 |  |  | 12.31 |
Vested |  |  | (6,439) |  |  | 2.05 |
Forfeited/expired |  |  | (237) |  |  | 2.02 |
Share conversion |  |  | 368 |  |  | 2.17 |
Nonvested at September 30, 2015 |  |  | 53,739 |  | $ | 12.12 |

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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