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Note 6 - Share-based Compensation and Employee Benefit Plan (Tables) | 3 Months Ended
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Mar. 31, 2018
Notes Tables |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
Three months ended March 31, 2018: |  | Number of Shares Awarded |  |  | Weighted Average Grant Date Fair Value |
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 |
Three months ended March 31, 2017: |  |  |  |  |  |  |  |
Unvested at December 31, 2016 |  |  | 35,264 |  |  |  | $12.84 |
Vested |  |  | (2,231 | ) |  |  | $13.03 |
Unvested at March 31, 2017 |  |  | 33,033 |  |  |  | $12.55 |

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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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