Note 14 - Stock Incentive and Employee Benefit Plans - Stock Option and Stock Appreciation Rights Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Outstanding, Number (in shares)	4,900,617	4,418,308	3,956,373
Outstanding, Weighted average exrecise price (in dollars per share)	$ 33.83	$ 29.19	$ 27.70
Granted, Number (in shares)	0	2,167,150	1,303,054
Granted, Weighted average exrecise price (in dollars per share)		$ 34.32	$ 39.50
Exercised, Number (in shares)	(408,839)	(1,287,216)	(524,185)
Exercised, Weighted average exrecise price (in dollars per share)	$ 18.61	$ 14.17	$ 18.20
Canceled, Number (in shares)	(484,611)	(397,625)	(316,934)
Canceled, Weighted average exrecise price (in dollars per share)	$ 41.34	$ 48.61	$ 71.20
Outstanding, Number (in shares)	4,007,167	4,900,617	4,418,308
Outstanding, Weighted average exrecise price (in dollars per share)	$ 34.47	$ 33.83	$ 29.19
Exercisable at end of year, Number (in shares)	2,789,384	2,554,114	1,952,477
Exercisable at end of year, Weighted average exrecise price (in dollars per share)	$ 33.32	$ 28.90	$ 19.90
Available for future grant, Number (in shares)	8,650,219	9,061,407	10,246,013