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Stock plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Stock plans |
Schedule of activity related to restricted stock |
Year Ended December 31 |  | 2017 |  | 2016 |  | 2015 |
Nonvested, January 1 |  | 12,362 |  | 14,309 |  | 14,309 |
Granted shares |  | 2,362 |  |  |  |  |
Vested shares |  | 10,542 |  | 1,947 |  |  |
Forfeited shares |  |  |  |  |  |  |
Nonvested, December 31 |  | 4,182 |  | 12,362 |  | 14,309 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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