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Stock plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Stock plans |
Schedule of activity related to restricted stock |
Year Ended December 31 |  | 2019 |  | 2018 |  | 2017 |
Nonvested, January 1 |  | 21,309 |  | 12,448 |  | 12,362 |
Granted shares |  | 17,345 |  | 11,468 |  | 10,628 |
Vested shares |  | 10,120 |  | 2,607 |  | 10,542 |
Forfeited shares |  | 1,069 |  |  |  |  |
Nonvested, December 31 |  | 27,465 |  | 21,309 |  | 12,448 |

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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=116856206&loc=d3e5070-113901 + Details
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