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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