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Note 14 - Employee Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Nonvested Restricted Stock Shares Activity [Table Text Block] |
|  |  |  |  |  | Weighted |  |  | Weighted |
|  |  |  |  |  | Average |  |  | Average |
|  |  |  |  |  | Grant |  |  | Remaining |
|  |  |  |  |  | Date |  |  | Contractual |
|  | Shares |  |  | Fair value |  |  | Term (in years) |
Unvested at December 31, 2019 |  |  | 35,676 |  |  | $ | 36.49 |  |  |  | 1.40 |
Granted |  |  | 49,349 |  |  |  | 49.90 |  |  |  | 0.80 |
Vested |  |  | (48,112 | ) |  |  | 45.49 |  |  |  |  |
Cancelled and forfeited |  |  | (891 | ) |  |  | 49.9 |  |  |  |  |
Unvested at December 31, 2020 |  |  | 36,022 |  |  |  | 42.73 |  |  |  | 1.40 |
Granted |  |  | 134,218 |  |  |  | 44.48 |  |  |  | 1.07 |
Vested |  |  | (88,225 | ) |  |  | 39.73 |  |  |  |  |
Cancelled and forfeited |  |  | (2,112 | ) |  |  | 44.48 |  |  |  |  |
Unvested at December 31, 2021 |  |  | 79,903 |  |  |  | 48.87 |  |  |  | 1.91 |
Granted |  |  | 117,969 |  |  |  | 36.70 |  |  |  | 1.27 |
Vested |  |  | (79,265 | ) |  |  | 40.80 |  |  |  |  |
Cancelled and forfeited |  |  | (7,343 | ) |  |  | 46.15 |  |  |  |  |
Unvested at December 31, 2022 |  |  | 111,264 |  |  | $ | 41.89 |  |  |  | 1.76 |
Expected to vest in the future at December 31, 2022 |  |  | 108,242 |  |  | $ | 41.89 |  |  |  | 1.76 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + 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) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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