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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | 2014 |  |  | 2013 |  |  | 2012 |
|  | (In thousands, except per share data) |
Net income, as reported |  | $ | 44,239 |  |  | $ | 37,752 |  |  | $ | 34,331 |
Divided by: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 29,788 |  |  |  | 30,047 |  |  |  | 30,402 |
Weighted average common stock equivalents |  |  | 29 |  |  |  | 26 |  |  |  | 31 |
Total weighted average common shares outstanding and common stock equivalents |  |  | 29,817 |  |  |  | 30,073 |  |  |  | 30,433 |
Basic earnings per common share |  | $ | 1.49 |  |  | $ | 1.26 |  |  | $ | 1.13 |
Diluted earnings per common share |  | $ | 1.48 |  |  | $ | 1.26 |  |  | $ | 1.13 |
Dividend Payout ratio |  |  | 40.3 | % |  |  | 41.3 | % |  |  | 46.0 | %

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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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