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Note 7 - Share-based Compensation and Employee Benefit Plan (Tables) | 3 Months Ended
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Mar. 31, 2019
Notes Tables |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
Three months ended March 31, 2019: |  | Number of Shares Awarded |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2018 |  |  | 31,790 |  |  | $ | 14.06 |
Vested |  |  | (8,936 | ) |  | $ | 15.07 |
Unvested at March 31, 2019 |  |  | 22,854 |  |  | $ | 13.66 |
Three months ended March 31, 2018: |  |  |  |  |  |  |  |
Unvested at December 31, 2017 |  |  | 25,870 |  |  | $ | 12.15 |
Granted |  |  | 14,199 |  |  | $ | 17.93 |
Vested |  |  | (2,935 | ) |  | $ | 14.18 |
Forfeited |  |  | (100 | ) |  | $ | 15.50 |
Unvested at March 31, 2018 |  |  | 37,034 |  |  | $ | 14.20 |

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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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