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Note 12 - Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Numerator- |  |  |  |  |  |  |  |  |  |  |  |
Numerator for basic and diluted earnings per share - |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders |  | $ | 40,582 |  |  | $ | 66,053 |  |  | $ | 79,957 |
Denominator- |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share – weighted average shares |  |  | 39,938 |  |  |  | 40,271 |  |  |  | 39,783 |
Effect of dilutive securities- |  |  |  |  |  |  |  |  |  |  |  |
Employee and director stock options and restricted share awards |  |  | 665 |  |  |  | 822 |  |  |  | 1,111 |
Denominator for diluted earnings per share - adjusted weighted average shares and assumed conversions |  |  | 40,603 |  |  |  | 41,093 |  |  |  | 40,894 |
Basic earnings per common share |  | $ | 1.02 |  |  | $ | 1.64 |  |  | $ | 2.01 |
Diluted earnings per common share and common share equivalents |  | $ | 1.00 |  |  | $ | 1.61 |  |  | $ | 1.96 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Anti-dilutive options – weighted average |  |  | 2,043 |  |  |  | 1,186 |  |  |  | 482 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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