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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
(In thousands, except per share data) |  | 2017 |  | 2016 |  | 2015
Net income available to common shareholders |  | $ | 92,940 |  |  | $ | 96,790 |  |  | $ | 74,107 |
Average common shares outstanding |  |  | 69,385 |  |  |  | 61,291 |  |  |  | 56,168 |
Average potential dilutive common shares |  |  | 468 |  |  |  | 636 |  |  |  | 252 |
Average diluted common shares |  |  | 69,853 |  |  |  | 61,927 |  |  |  | 56,420 |
Basic earnings per share |  | $ | 1.34 |  |  | $ | 1.58 |  |  | $ | 1.32 |
Diluted earnings per share |  | $ | 1.33 |  |  | $ | 1.56 |  |  | $ | 1.31 |

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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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