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Note 2 - 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] |
|  | 2017 |  | 2016 |  | 2015
|  | (In thousands, except per share data)
Net income, as reported |  | $ | 41,121 |  |  | $ | 64,916 |  |  | $ | 46,209 |
Divided by: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 29,080 |  |  |  | 28,957 |  |  |  | 29,106 |
Weighted average common stock equivalents |  |  | 2 |  |  |  | 13 |  |  |  | 20 |
Total weighted average common shares outstanding and common stock equivalents |  |  | 29,082 |  |  |  | 28,970 |  |  |  | 29,126 |
Basic earnings per common share |  | $ | 1.41 |  |  | $ | 2.24 |  |  | $ | 1.59 |
Diluted earnings per common share |  | $ | 1.41 |  |  | $ | 2.24 |  |  | $ | 1.59 |
Dividend Payout ratio |  |  | 51.1 | % |  |  | 30.4 | % |  |  | 40.3 | %

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