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Note 6 - Earnings per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
(In thousands, except per share amounts) |  | 2020 |  |  | 2019 |  |  | 2018 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 69,500 |  |  | $ | 61,071 |  |  | $ | 55,027 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share - weighted-average shares |  |  | 82,527 |  |  |  | 81,945 |  |  |  | 81,885 |
Effect of dilutive stock options |  |  | 637 |  |  |  | 725 |  |  |  | 839 |
Diluted earnings per common share - weighted-average shares and assumed conversions |  |  | 83,164 |  |  |  | 82,670 |  |  |  | 82,724 |
Basic earnings per common share |  | $ | 0.84 |  |  | $ | 0.75 |  |  | $ | 0.67 |
Diluted earnings per common share |  | $ | 0.84 |  |  | $ | 0.74 |  |  | $ | 0.67 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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