Note 1 - General (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Expense (Benefit)	$ 56,277	$ 67,067	$ 154,499	$ 192,778
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit)	$ (4,500)
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life			5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life			8 years