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Note 15 - Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Number of Shares Awarded |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2017 |  |  | 25,870 |  |  | $ | 12.15 |
Granted |  |  | 18,323 |  |  | $ | 18.07 |
Vested |  |  | (10,999 | ) |  | $ | 16.21 |
Forfeited |  |  | (1,404 | ) |  | $ | 14.44 |
Unvested at December 31, 2018 |  |  | 31,790 |  |  | $ | 14.06 |
Granted |  |  | 9,675 |  |  | $ | 15.52 |
Vested |  |  | (19,995 | ) |  | $ | 15.99 |
Unvested at December 31, 2019 |  |  | 21,470 |  |  | $ | 12.91 |
Granted |  |  | 12,484 |  |  | $ | 6.12 |
Vested |  |  | (12,903 | ) |  | $ | 13.82 |
Forfeited |  |  | (2,553 | ) |  | $ | 15.86 |
Unvested at December 31, 2020 |  |  | 18,498 |  |  | $ | 7.29 |

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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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