XML 58 R44.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Stock plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Stock plans |
Schedule of activity related to restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Ended December 31 |  | 2021 |  | 2020 |  | 2019 |
Nonvested, January 1 |  | 31,923 |  | 25,984 |  | 12,892 | ​
Granted shares | ​ | 19,818 |  | 16,269 |  | 17,345 | ​
Vested shares |  | 15,460 | ​ | 8,455 | ​ | 2,542 | ​
Forfeited shares | ​ | ​ | ​ | 1,875 | ​ | 1,711 | ​
Nonvested, December 31 |  | 36,281 |  | 31,923 |  | 25,984 | ​

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration