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Note 6 - Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
(In thousands, except per share amounts) |  | 2013 |  |  | 2012 |  |  | 2011 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 30,147 |  |  | $ | 27,267 |  |  | $ | 24,285 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share - weighted-average shares |  |  | 33,221 |  |  |  | 33,095 |  |  |  | 32,969 |
Effect of dilutive stock options |  |  | 208 |  |  |  | 130 |  |  |  | 144 |
Diluted earnings per common share - weighted-average shares and assumed conversions |  |  | 33,429 |  |  |  | 33,225 |  |  |  | 33,113 |
Basic earnings per common share |  | $ | 0.91 |  |  | $ | 0.82 |  |  | $ | 0.74 |
Diluted earnings per common share |  | $ | 0.90 |  |  | $ | 0.82 |  |  | $ | 0.73 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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