Note 7 - Stock-Based Compensation (Details) - RSU Summary (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Note 7 - Stock-Based Compensation (Details) - RSU Summary [Line Items]
Outstanding at January 1, 2012	3,582,000		1,630,000		1,299,000
Outstanding at January 1, 2012	$ 22,530		$ 17,460		$ 16,870
Modification (1)						[1]
Modification (1)						[1]
Shares	1,426,000	[2],[3]	2,974,000	[2]	1,580,000	[2],[4]
Weighted-Average Grant Date Fair Value Per Share	$ 34,820	[2],[3]	$ 23,890	[2]	$ 18,420	[2],[4]
Shares	(139,000)	[5]	(124,000)	[5]	(624,000)	[5]
Weighted-Average Grant Date Fair Value Per Share	$ 31,400	[5]	$ 21,980	[5]	$ 18,190	[5]
Shares	(772,000)		(725,000)		(544,000)
Weighted-Average Grant Date Fair Value Per Share	$ 19,480		$ 17,950		$ 17,910
Shares	(49,000)		(173,000)		(81,000)
Weighted-Average Grant Date Fair Value Per Share	$ 19,770		$ 17,610		$ 16,740
Shares	4,048,000		3,582,000		1,630,000
Weighted-Average Grant Date Fair Value Per Share	$ 26,140		$ 22,530		$ 17,460
Time-Based RSUs [Member]
Note 7 - Stock-Based Compensation (Details) - RSU Summary [Line Items]
Outstanding at January 1, 2012	754,000		1,099,000		1,082,000
Outstanding at January 1, 2012	$ 19,410		$ 16,960		$ 16,000
Modification (1)					(76,000)	[1]
Modification (1)					$ 15,690	[1]
Shares	335,000	[2],[3]	299,000	[2]	617,000	[2],[4]
Weighted-Average Grant Date Fair Value Per Share	$ 36,710	[2],[3]	$ 24,250	[2]	$ 18,690	[2],[4]
Shares		[5]		[5]		[5]
Weighted-Average Grant Date Fair Value Per Share		[5]		[5]		[5]
Shares	(468,000)		(519,000)		(447,000)
Weighted-Average Grant Date Fair Value Per Share	$ 20,360		$ 17,570		$ 17,300
Shares	(32,000)		(125,000)		(77,000)
Weighted-Average Grant Date Fair Value Per Share	$ 19,750		$ 17,060		$ 16,610
Shares	589,000		754,000		1,099,000
Weighted-Average Grant Date Fair Value Per Share	$ 28,480		$ 19,410		$ 16,960
PSUs [Member]
Note 7 - Stock-Based Compensation (Details) - RSU Summary [Line Items]
Outstanding at January 1, 2012	1,028,000		531,000		217,000
Outstanding at January 1, 2012	$ 23,020		$ 18,490		$ 20,730
Modification (1)					76,000	[1]
Modification (1)					$ 15,690	[1]
Shares	1,091,000	[2],[3]	875,000	[2]	963,000	[2],[4]
Weighted-Average Grant Date Fair Value Per Share	$ 34,230	[2],[3]	$ 24,430	[2]	$ 18,240	[2],[4]
Shares	(139,000)	[5]	(124,000)	[5]	(624,000)	[5]
Weighted-Average Grant Date Fair Value Per Share	$ 31,400	[5]	$ 21,980	[5]	$ 18,190	[5]
Shares	(304,000)		(206,000)		(97,000)
Weighted-Average Grant Date Fair Value Per Share	$ 18,120		$ 18,900		$ 20,730
Shares	(17,000)		(48,000)		(4,000)
Weighted-Average Grant Date Fair Value Per Share	$ 19,790		$ 19,060		$ 19,070
Shares	1,659,000		1,028,000		531,000
Weighted-Average Grant Date Fair Value Per Share	$ 28,110		$ 23,020		$ 18,490
MSUs [Member]
Note 7 - Stock-Based Compensation (Details) - RSU Summary [Line Items]
Outstanding at January 1, 2012	1,800,000
Outstanding at January 1, 2012	$ 23,570
Modification (1)						[1]
Modification (1)						[1]
Shares		[2],[3]	1,800,000	[2]		[2],[4]
Weighted-Average Grant Date Fair Value Per Share		[2],[3]	$ 23,570	[2]		[2],[4]
Shares		[5]		[5]		[5]
Weighted-Average Grant Date Fair Value Per Share		[5]		[5]		[5]
Shares	1,800,000		1,800,000
Weighted-Average Grant Date Fair Value Per Share	$ 23,570		$ 23,570

[1] See "2011 and 2012 CEO Awards" below for further discussion.

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

[3] Amount does not include 674,000 shares of time-based RSUs and PSUs authorized by the Board of Directors in October 2014, as the grant date of these awards has not been established at the time of approval. See "2014 Time-Based RSUs and PSUs" below for further discussion.

[4] Amount includes 74,000 shares granted as a result of the equity award modification. See "Equity Award Modifications" above for further discussion.

[5] Amount reflects the number of PSUs that have not been earned or may not be earned based on management's probability assessment.