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Note 7 - Share-based Compensation and Employee Benefit Plan (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
Three months ended September 30, 2019: |  | Number of Shares Awarded |  |  | Weighted Average Grant Date Fair Value |
Unvested at June 30, 2019 |  |  | 29,529 |  |  | $ | 13.94 |
Vested |  |  | (2,392 | ) |  | $ | 17.11 |
Unvested at September 30, 2019 |  |  | 27,137 |  |  | $ | 13.66 |
Nine months ended September 30, 2019: |  |  |  |  |  |  |  |
Unvested at December 31, 2018 |  |  | 31,790 |  |  | $ | 14.06 |
Granted |  |  | 9,675 |  |  | $ | 15.52 |
Vested |  |  | (14,328 | ) |  | $ | 15.79 |
Unvested at September 30, 2019 |  |  | 27,137 |  |  | $ | 13.66 |
Three months ended September 30, 2018: |  | Number of Shares Awarded |  |  | Weighted Average Grant Date Fair Value |
Unvested at June 30, 2018 |  |  | 38,086 |  |  | $ | 14.57 |
Vested |  |  | (2,388 | ) |  | $ | 16.24 |
Forfeited |  |  | (200 | ) |  | $ | 15.50 |
Unvested at September 30, 2018 |  |  | 35,498 |  |  | $ | 14.46 |
Nine months ended September 30, 2018: |  |  |  |  |  |  |  |
Unvested at December 31, 2017 |  |  | 25,870 |  |  | $ | 12.15 |
Granted |  |  | 18,323 |  |  | $ | 18.07 |
Vested |  |  | (7,291 | ) |  | $ | 15.36 |
Forfeited |  |  | (1,404 | ) |  | $ | 14.44 |
Unvested at September 30, 2018 |  |  | 35,498 |  |  | $ | 14.46 |

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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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