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Note 6 - Earnings per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
(In thousands, except per share amounts) |  | 20 15 |  |  | 2014 |  |  | 2013 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 35,745 |  |  | $ | 29,834 |  |  | $ | 30,147 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share - weighted-average shares |  |  | 33,477 |  |  |  | 33,381 |  |  |  | 33,221 |
Effect of dilutive stock options |  |  | 238 |  |  |  | 297 |  |  |  | 208 |
Diluted earnings per common share - weighted-average shares and assumed conversions |  |  | 33,715 |  |  |  | 33,678 |  |  |  | 33,429 |
Basic earnings per common share |  | $ | 1.07 |  |  | $ | 0.89 |  |  | $ | 0.91 |
Diluted earnings per common share |  | $ | 1.06 |  |  | $ | 0.89 |  |  | $ | 0.90 |

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