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Note 5 - Share-based Compensation and Employee Benefit Plan (Tables) | 3 Months Ended
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Mar. 31, 2017
Notes Tables |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
Three months ended March 31, 2017: |  | Number of Shares Awarded |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2016 |  |  | 35,264 |  |  | $ | 12.84 |
Vested |  |  | (2,231 | ) |  | $ | (13.03 | )
Unvested at March 31, 2017 |  |  | 33,033 |  |  | $ | 12.55 |
Three months ended March 31, 2016: |  |  |  |  |  |  |  |
Unvested at December 31, 2015 |  |  | 55,854 |  |  | $ | 12.83 |
Granted |  |  | 58,084 |  |  | $ | 15.25 |
Unvested at March 31, 2016 |  |  | 113,938 |  |  | $ | 14.06 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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