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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
(In thousands, except per share data) |  | 2016 |  | 2015 |  | 2014
Net income available to common shareholders |  | $ | 96,790 |  |  | $ | 74,107 |  |  | $ | 35,688 |
Average common shares outstanding |  |  | 30,646 |  |  |  | 28,084 |  |  |  | 16,879 |
Average potential dilutive common shares |  |  | 318 |  |  |  | 126 |  |  |  | 43 |
Average diluted common shares |  |  | 30,964 |  |  |  | 28,210 |  |  |  | 16,922 |
Basic earnings per share |  | $ | 3.16 |  |  | $ | 2.64 |  |  | $ | 2.11 |
Diluted earnings per share |  | $ | 3.13 |  |  | $ | 2.63 |  |  | $ | 2.11 |

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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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