Note 7 - Stock-Based Compensation (Details) - RSU Summary - $ / shares		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 7 - Stock-Based Compensation (Details) - RSU Summary [Line Items]
Shares (in Shares)		4,048,000	3,582,000	1,630,000
Weighted-Average Grant Date Fair Value Per Share		$ 26.14	$ 22.53	$ 17.46
Shares (in Shares)		1,562,000	1,426,000	2,974,000
Weighted-Average Grant Date Fair Value Per Share		$ 46.03	$ 34.82	$ 23.89
Shares (in Shares)		(364,000)	(139,000)	(124,000)
Weighted-Average Grant Date Fair Value Per Share		$ 39.20	$ 31.40	$ 21.98
Shares (in Shares)		(948,000)	(772,000)	(725,000)
Weighted-Average Grant Date Fair Value Per Share		$ 24.47	$ 19.48	$ 17.95
Shares (in Shares)		(66,000)	(49,000)	(173,000)
Weighted-Average Grant Date Fair Value Per Share		$ 33.06	$ 19.77	$ 17.61
Shares (in Shares)		4,232,000	4,048,000	3,582,000
Weighted-Average Grant Date Fair Value Per Share		$ 32.64	$ 26.14	$ 22.53
Time-Based RSUs [Member]
Note 7 - Stock-Based Compensation (Details) - RSU Summary [Line Items]
Shares (in Shares)		589,000	754,000	1,099,000
Weighted-Average Grant Date Fair Value Per Share		$ 28.48	$ 19.41	$ 16.96
Shares (in Shares)		271,000	335,000	299,000
Weighted-Average Grant Date Fair Value Per Share		$ 49.82	$ 36.71	$ 24.25
Shares (in Shares)		(319,000)	(468,000)	(519,000)
Weighted-Average Grant Date Fair Value Per Share		$ 26.56	$ 20.36	$ 17.57
Shares (in Shares)		(42,000)	(32,000)	(125,000)
Weighted-Average Grant Date Fair Value Per Share		$ 35.60	$ 19.75	$ 17.06
Shares (in Shares)		499,000	589,000	754,000
Weighted-Average Grant Date Fair Value Per Share		$ 40.75	$ 28.48	$ 19.41
PSUs and MPSUs [Member]
Note 7 - Stock-Based Compensation (Details) - RSU Summary [Line Items]
Shares (in Shares)		1,659,000	1,028,000	531,000
Weighted-Average Grant Date Fair Value Per Share		$ 28.11	$ 23.02	$ 18.49
Shares (in Shares)	[1]	1,291,000	1,091,000	875,000
Weighted-Average Grant Date Fair Value Per Share		$ 45.24	$ 34.23	$ 24.43
Shares (in Shares)	[2]	(364,000)	(139,000)	(124,000)
Weighted-Average Grant Date Fair Value Per Share		$ 39.20	$ 31.40	$ 21.98
Shares (in Shares)		(629,000)	(304,000)	(206,000)
Weighted-Average Grant Date Fair Value Per Share		$ 23.40	$ 18.12	$ 18.90
Shares (in Shares)		(24,000)	(17,000)	(48,000)
Weighted-Average Grant Date Fair Value Per Share		$ 28.68	$ 19.79	$ 19.06
Shares (in Shares)		1,933,000	1,659,000	1,028,000
Weighted-Average Grant Date Fair Value Per Share		$ 38.99	$ 28.11	$ 23.02
MSUs [Member]
Note 7 - Stock-Based Compensation (Details) - RSU Summary [Line Items]
Shares (in Shares)		1,800,000	1,800,000
Weighted-Average Grant Date Fair Value Per Share		$ 23.57	$ 23.57
Shares (in Shares)				1,800,000
Weighted-Average Grant Date Fair Value Per Share				$ 23.57
Shares (in Shares)		1,800,000	1,800,000	1,800,000
Weighted-Average Grant Date Fair Value Per Share		$ 23.57	$ 23.57	$ 23.57

[1] Amount reflects the maximum number of PSUs and MPSUs that can be earned assuming the achievement of the highest level of performance conditions.

[2] Amount reflects the number of PSUs and MPSUs that have not been earned or may not be earned based on management's probability assessment at each reporting period.