Note 2 - Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		1 Months Ended					6 Months Ended	1 Months Ended		6 Months Ended		1 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Apr. 30, 2013 2014 Plan [Member]	Jun. 30, 2014 Time-Based RSUs, PSUs, MSUs [Member]	Jun. 30, 2013 Time-Based RSUs, PSUs, MSUs [Member]	Jun. 30, 2014 Time-Based RSUs, PSUs, MSUs [Member]	Jun. 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]	Jun. 30, 2014 Time-Based RSUs [Member]	Feb. 28, 2014 PSUs [Member] Executive Officer [Member]	Apr. 30, 2014 PSUs [Member] Non-Executive Employees [Member]	Jun. 30, 2014 PSUs [Member]		Apr. 30, 2014 PSUs [Member] Minimum [Member] Non-Executive Employees [Member]	Apr. 30, 2014 PSUs [Member] Maximum [Member] Non-Executive Employees [Member]	Jun. 30, 2014 Unvested Options [Member]	Jun. 30, 2014 2004 Plan [Member]	Jun. 30, 2014 Employee Stock Purchase Plan [Member]	Jun. 30, 2013 Employee Stock Purchase Plan [Member]	Jun. 30, 2014 Employee Stock Purchase Plan [Member]	Jun. 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)																							2,700,000
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						$ 8,300,000	$ 2,900,000	$ 18,500,000	$ 11,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding						169,700,000		169,700,000
Share Price (in Dollars per share)	$ 42.35		$ 42.35
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	300,000		300,000			63,000,000		63,000,000																75,000		75,000
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)			1,117,436							336,000	139,000		78,000		236,858		61,000	880,578	[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	4,900,000	5,400,000	11,800,000	10,900,000																						500,000	500,000
Proceeds from Stock Options Exercised			8,600,000	16,200,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares)																								0	0	43,000	65,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)																								4,800,000		4,800,000
Proceeds from Stock Plans			$ 1,053,000	$ 1,167,000

[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.