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Note 6 - Earnings Per Common Share | 12 Months Ended
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Dec. 31, 2017
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) |  | 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 |
Options totaling 145,169, 564,833 and 542,333 equivalent shares were outstanding but were not included in the calculation of diluted earnings per share for 2017, 2016 and 2015, 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 12 ) totaling 124,046, 64,162 and 116,092 equivalent shares for 2017, 2016 and 2015, 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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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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