Note 2 - Stock-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		1 Months Ended					9 Months Ended	1 Months Ended				9 Months Ended				3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Apr. 30, 2013 2014 Plan [Member]	Sep. 30, 2014 Time-Based RSUs, PSUs, MSUs [Member]	Sep. 30, 2013 Time-Based RSUs, PSUs, MSUs [Member]	Sep. 30, 2014 Time-Based RSUs, PSUs, MSUs [Member]	Sep. 30, 2013 Time-Based RSUs, PSUs, MSUs [Member]	Feb. 28, 2014 Time-Based RSU's and PSUs [Member] Executive Officer [Member]	Apr. 30, 2014 Time-Based RSU's and PSUs [Member] Non-Executive Employees [Member]	Feb. 28, 2014 Time-Based RSUs [Member] Executive Officer [Member]	Apr. 30, 2014 Time-Based RSUs [Member] Non-Executive Employees [Member]	Feb. 28, 2014 Time-Based RSUs [Member] Non-Executive Employees [Member]	Sep. 30, 2014 Time-Based RSUs [Member]	Apr. 30, 2014 PSUs [Member] Minimum [Member] Non-Executive Employees [Member]	Apr. 30, 2014 PSUs [Member] Maximum [Member] Non-Executive Employees [Member]	Feb. 28, 2014 PSUs [Member] Executive Officer [Member]	Apr. 30, 2014 PSUs [Member] Non-Executive Employees [Member]	Sep. 30, 2014 PSUs [Member]		Sep. 30, 2014 Unvested Options [Member]	Sep. 30, 2014 2004 Plan [Member]	Sep. 30, 2014 Employee Stock Purchase Plan [Member]	Sep. 30, 2013 Employee Stock Purchase Plan [Member]	Sep. 30, 2014 Employee Stock Purchase Plan [Member]	Sep. 30, 2013 Employee Stock Purchase Plan [Member]
Note 2 - Stock-Based Compensation (Details) [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance (in Shares)																							4,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)					5,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested						$ 5,300,000	$ 3,200,000	$ 23,800,000	$ 14,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding						182,700,000		182,700,000
Share Price (in Dollars per share)						$ 44.05		$ 44.05
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	200,000		200,000			79,500,000		79,500,000																200,000		200,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition								6 years														1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)			1,403,698							336,000	139,000		78,000		312,697				61,000	1,091,001	[1]
Percentage Of Time Based RSUs														25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period												2 years	4 years					2 years	2 years
Percentage Of Time Based PSU																		75.00%
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed										300.00%						200.00%	300.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	2,300,000	11,300,000	14,100,000	22,200,000																				500,000	300,000	900,000	800,000
Proceeds from Stock Options Exercised			10,400,000	32,700,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares)																								34,000	46,000	78,000	111,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)																								4,700,000		4,700,000
Proceeds from Stock Plans			$ 2,078,000	$ 2,145,000

[1] The number of PSUs granted reflects the maximum number of shares that can ultimately be earned assuming the achievement of the highest level of performanceconditions under the programs.