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Note 7 - Share-based Compensation and Employee Benefit Plan (Tables) | 6 Months Ended
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Jun. 30, 2018
Notes Tables |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
Three months ended June 30, 2018: |  | Number of Shares Awarded |  |  | Weighted Average Grant Date Fair Value |
Unvested at March 31, 2018 |  |  | 37,034 |  |  | $ | 14.20 |
Granted |  |  | 4,124 |  |  | $ | 18.55 |
Vested |  |  | (1,968 | ) |  | $ | 16.05 |
Forfeited |  |  | (1,104 | ) |  | $ | 14.15 |
Unvested at June 30, 2018 |  |  | 38,086 |  |  | $ | 14.57 |
Six months ended June 30, 2018: |  |  |  |  |  |  |  |
Unvested at December 31, 2017 |  |  | 25,870 |  |  | $ | 12.15 |
Granted |  |  | 18,323 |  |  | $ | 18.07 |
Vested |  |  | (4,903 | ) |  | $ | 14.93 |
Forfeited |  |  | (1,204 | ) |  | $ | 14.26 |
Unvested at June 30, 2018 |  |  | 38,086 |  |  | $ | 14.57 |
Three months ended June 30, 2017: |  | Number of Shares Awarded |  |  | Weighted Average Grant Date Fair Value |
Unvested at March 31, 2017 |  |  | 33,033 |  |  | $ | 12.55 |
Granted |  |  | 5,084 |  |  | $ | 15.05 |
Forfeited |  |  | (6,000 | ) |  | $ | 15.50 |
Unvested at June 30, 2017 |  |  | 32,117 |  |  | $ | 12.39 |
Six months ended June 30, 2017: |  |  |  |  |  |  |  |
Unvested at December 31, 2016 |  |  | 35,264 |  |  | $ | 12.84 |
Granted |  |  | 5,084 |  |  | $ | 15.05 |
Vested |  |  | (2,231 | ) |  | $ | 13.05 |
Forfeited |  |  | (6,000 | ) |  | $ | 15.50 |
Unvested at June 30, 2017 |  |  | 32,117 |  |  | $ | 12.39 |

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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=109197908&loc=d3e5070-113901 + Details
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- References No definition available. + Details
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