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Note 1 - Basis of Presentation (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Expense (Benefit) | $ 14,678,000 | $ 10,782,000 | $ 35,429,000 | $ 34,209,000
Employee Stock Option [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 3,305 | 0 | 61,395
Accounting Standards Update 2016-09 [Member] |  |  |  |
Income Tax Expense (Benefit) | $ 22,000 |  | $ 1,500,000 |

X
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