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Stock plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Stock plans |
Schedule of activity related to restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Ended December 31 |  | 2020 |  | 2019 |  | 2018 |
Nonvested, January 1 |  | 25,984 |  | 12,892 |  | 1,538 | ​
Granted shares | ​ | 16,269 |  | 17,345 |  | 11,468 | ​
Vested shares |  | 8,455 | ​ | 2,542 | ​ | 114 | ​
Forfeited shares | ​ | 1,875 | ​ | 1,711 | ​ | ​ | ​
Nonvested, December 31 |  | 31,923 |  | 25,984 |  | 12,892 | ​

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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