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Note 6 - Earnings Per Common Share (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 amounts) |  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 90,284 |  |  | $ | 33,464 |  |  | $ | 35,745 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share - weighted-average shares |  |  | 54,492 |  |  |  | 54,177 |  |  |  | 55,796 |
Effect of dilutive stock options |  |  | 358 |  |  |  | 284 |  |  |  | 395 |
Diluted earnings per common share - weighted-average shares and assumed conversions |  |  | 54,850 |  |  |  | 54,461 |  |  |  | 56,191 |
Basic earnings per common share |  | $ | 1.66 |  |  | $ | 0.62 |  |  | $ | 0.64 |
Diluted earnings per common share |  | $ | 1.65 |  |  | $ | 0.61 |  |  | $ | 0.64 |

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