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Note 11 - New Accounting Pronouncements (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Tax Expense (Benefit) $ 12,584 $ 6,992 $ 20,163 $ 8,539
Accounting Standards Update 2016-09 [Member]        
Income Tax Expense (Benefit) $ (900)   $ (2,000)