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Note 11 - Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Number of Shares Awarded (1) |  |  | Weighted Average Grant Date F air Value (1) |
Non-vested at December 31, 2012 |  |  | 4,456 |  |  | $ | 17.30 |
2013 Granted |  |  | 32,964 |  |  |  | 12.40 |
Vested |  |  | (9,238 | ) |  |  | 14.10 |
Non-vested at December 31, 2013 |  |  | 28,182 |  |  | $ | 12.60 |
2014 Granted |  |  | 73,558 |  |  |  | 13.21 |
Vested |  |  | (22,532 | ) |  |  | 11.76 |
Non-vested at December 31, 2014 |  |  | 79,208 |  |  | $ | 12.79 |
2015 Granted |  |  | 12,700 |  |  |  | 16.85 |
Vested |  |  | (32,015 | ) |  |  | 13.14 |
Forfeited |  |  | (4,039 | ) |  |  | 14.36 |
Non-vested at December 31, 2015 |  |  | 55,854 |  |  | $ | 12.83 |

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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=6415400&loc=d3e5070-113901 + Details
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