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Note 12 - Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Number of Shares Awarded |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2015 |  |  | 55,854 |  |  | $ | 12.83 |
Granted |  |  | 58,084 |  |  | $ | 15.25 |
Vested |  |  | (8,161 | ) |  | $ | 14.79 |
Forfeited |  |  | (70,513 | ) |  | $ | 14.67 |
Unvested at December 31, 2016 |  |  | 35,264 |  |  | $ | 12.84 |
Granted |  |  | 5,084 |  |  | $ | 15.05 |
Vested |  |  | (7,878 | ) |  | $ | 14.31 |
Forfeited |  |  | (6,600 | ) |  | $ | 15.50 |
Unvested at December 31, 2017 |  |  | 25,870 |  |  | $ | 12.15 |
Granted |  |  | 18,323 |  |  | $ | 18.07 |
Vested |  |  | (10,999 | ) |  | $ | 16.21 |
Forfeited |  |  | (1,404 | ) |  | $ | 14.44 |
Unvested at December 31, 2018 |  |  | 31,790 |  |  | $ | 14.06 |

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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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