Note 19 - Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	$ 71,979		$ 74,236,000
Assets, Fair Value Disclosure, Recurring	3,418,045	[1]	2,764,988	[1]
Deferred Compensation Plan, Restricted Cash Equivalents [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities			19,817
Deferred Compensation Plan, Marketable Securities [Member] | Equity Securities [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities			22,235
Deferred Compensation Plan, Marketable Securities [Member] | Fixed Income Securities [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities			5,062
Deferred Compensation Plan, Marketable Securities [Member] | Mutual Funds [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities			27,122
Fair Value, Inputs, Level 1 [Member]
Deferred Compensation Plan Assets [Abstract]
Assets, Fair Value Disclosure, Recurring	3,275,503	[1]	2,759,926	[1]
Fair Value, Inputs, Level 1 [Member] | Deferred Compensation Plan, Restricted Cash Equivalents [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities			19,817
Fair Value, Inputs, Level 1 [Member] | Deferred Compensation Plan, Marketable Securities [Member] | Equity Securities [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities			22,235
Fair Value, Inputs, Level 1 [Member] | Deferred Compensation Plan, Marketable Securities [Member] | Fixed Income Securities [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities			0
Fair Value, Inputs, Level 1 [Member] | Deferred Compensation Plan, Marketable Securities [Member] | Mutual Funds [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities			27,122
Fair Value, Inputs, Level 2 [Member]
Deferred Compensation Plan Assets [Abstract]
Assets, Fair Value Disclosure, Recurring	142,542	[1]	5,062	[1]
Fair Value, Inputs, Level 2 [Member] | Deferred Compensation Plan, Restricted Cash Equivalents [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities			0
Fair Value, Inputs, Level 2 [Member] | Deferred Compensation Plan, Marketable Securities [Member] | Equity Securities [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities			0
Fair Value, Inputs, Level 2 [Member] | Deferred Compensation Plan, Marketable Securities [Member] | Fixed Income Securities [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities			5,062
Fair Value, Inputs, Level 2 [Member] | Deferred Compensation Plan, Marketable Securities [Member] | Mutual Funds [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities			0
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	3,206,811
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	71,979
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	65,222
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	6,199
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | Foreign Government Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	8,213
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | US Government Agencies Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	25,890
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	24,920
Fair Value, Measurements, Recurring [Member] | Other Long-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	74,033
Fair Value, Measurements, Recurring [Member] | Other Long-term Investments [Member] | US Government Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	14,531
Fair Value, Measurements, Recurring [Member] | Other Long-term Investments [Member] | Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	753
Fair Value, Measurements, Recurring [Member] | Other Long-term Investments [Member] | Corporate Bond Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	58,749
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan, Restricted Cash Equivalents [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	17,938
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan, Marketable Securities [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	23,530
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan, Marketable Securities [Member] | Fixed Income Securities [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	5,136
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan, Marketable Securities [Member] | Mutual Funds [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	25,375
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	3,189,462	[2]	2,690,752	[2]
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	750
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	16,599
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	3,200,461
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	66,843
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	8,199
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	6,199
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Foreign Government Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | US Government Agencies Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	2,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Long-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Long-term Investments [Member] | US Government Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Long-term Investments [Member] | Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Long-term Investments [Member] | Corporate Bond Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Deferred Compensation Plan, Restricted Cash Equivalents [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	17,938
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Deferred Compensation Plan, Marketable Securities [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	23,530
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Deferred Compensation Plan, Marketable Securities [Member] | Fixed Income Securities [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Deferred Compensation Plan, Marketable Securities [Member] | Mutual Funds [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	25,375
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	3,189,462	[2]	2,690,752	[2]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	10,999
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	6,350
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	5,136
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	57,023
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | Foreign Government Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	8,213
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | US Government Agencies Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	25,890
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	22,920
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Long-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	74,033
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Long-term Investments [Member] | US Government Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	14,531
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Long-term Investments [Member] | Municipal Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	753
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Long-term Investments [Member] | Corporate Bond Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Fair Value Disclosure	58,749
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Deferred Compensation Plan, Restricted Cash Equivalents [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Deferred Compensation Plan, Marketable Securities [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Deferred Compensation Plan, Marketable Securities [Member] | Fixed Income Securities [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	5,136
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Deferred Compensation Plan, Marketable Securities [Member] | Mutual Funds [Member]
Deferred Compensation Plan Assets [Abstract]
Deferred compensation plan - marketable securities	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	[2]	0	[2]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	750
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 5,600

[1] Included in Deferred compensation plan - marketable securities and Deferred compensation plan - restricted cash equivalents in the accompanying consolidated balance sheets as of December 31, 2011 and 2010.

[2] Included in Cash and cash equivalents in the accompanying consolidated balance sheets as of December 31, 2011 and 2010.