Note 14 - Stock Incentive and Employee Benefit Plans (Details) - Stock Option And Stock Appreciation Rights Activity - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Option And Stock Appreciation Rights Activity [Abstract]
Outstanding, beginning of year	4,418,308	3,956,373	3,723,276
Outstanding, beginning of year (in Dollars per share)	$ 29.19	$ 27.70	$ 21.05
Granted	2,167,150	1,303,054	1,252,320
Granted (in Dollars per share)	$ 34.32	$ 39.50	$ 42.00
Exercised	(1,287,216)	(524,185)	(895,865)
Exercised (in Dollars per share)	$ 14.17	$ 18.20	$ 17.75
Canceled	(397,625)	(316,934)	(123,359)
Canceled (in Dollars per share)	$ 48.61	$ 71.20	$ 43.95
Outstanding, end of year	4,900,617	4,418,308	3,956,373
Outstanding, end of year (in Dollars per share)	$ 33.83	$ 29.19	$ 27.70
Exercisable at end of year	2,554,114	1,952,477	1,947,313
Exercisable at end of year (in Dollars per share)	$ 28.90	$ 19.90	$ 21.40
Available for future grant	9,061,407	10,246,013	2,794,218