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Stock Options (Tables) | 6 Months Ended
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Jun. 30, 2022
Stock Options |
Summary of option activity under stock option plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  |  | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | average | ​ | remaining | ​ | Aggregate | ​
​ | ​ | Number of | ​ | exercise | ​ | contractual | ​ | intrinsic | ​
​ | ​ | options | ​ | price | ​ | term (years) | ​ | value ($) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (in Thousands) | ​
Options outstanding at December 31, 2021 |  | 520,551 | ​ | $ | 28.28 | ​ | ​ | ​ | ​ | ​ | ​
Plus: Options granted |  | 31,150 | ​ |  | 38.92 | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercised |  | 17,437 | ​ |  | 22.27 | ​ | ​ | ​ | ​ | ​ | ​
Options expired |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Options forfeited |  | 7,650 | ​ |  | 32.89 | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at June 30, 2022 |  | 526,614 | ​ |  | 29.04 |  | 4.36 | ​ | $ | 5,812 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options fully vested and exercisable at June 30, 2022 |  | 302,669 | ​ | $ | 24.70 |  | 2.59 | ​ | $ | 4,656 | ​
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