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Note 6 - Earnings per Common Share | 12 Months Ended
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Dec. 31, 2020
Notes to Financial Statements |
Earnings Per Share [Text Block] | 6. Earnings per Common Share Basic and diluted earnings per common share were computed as follows:
(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 |
Options totaling 266,650, 330,450 and 230,250 equivalent shares were outstanding but were not included in the calculation of diluted earnings per share for 2020, 2019 and 2018, respectively, because including the options in the denominator would be antidilutive, or decrease the number of weighted-average shares, due to their exercise prices exceeding the average market price of the common shares, or because inclusion of average unrecognized compensation expense in the calculation would cause the options to be antidilutive. Unvested performance unit awards (see Note 13) totaling 46,705, 104,454 and 2,457 equivalent shares for 2020, 2019 and 2018, respectively, were considered outstanding but were not included in the calculation of diluted earnings per share because inclusion of average unrecognized compensation expense in the calculation would cause the performance units to be antidilutive.

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