Note 6 - Marketable Securities (Detail) - Amortized cost and estimated fair value of investments in available-for-sale securities, by contractual maturity: (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Mature in one year or less	$ 214,006
Mature in one year or less	219,000
Mature after one year through three years	7,998
Mature after one year through three years	8,415
Mature in more than three years	20,501
Mature in more than three years	20,650
Total	242,505
Total	$ 248,065	$ 251,015

Note 6 - Marketable Securities (Detail) - Amortized cost and estimated fair value of investments in available-for-sale securities, by contractual maturity: (USD $)
In Thousands, unless otherwise specified

Mar. 31, 2013

Dec. 31, 2012

$ 214,006

Mature in one year or less

219,000

Mature after one year through three years

7,998

Mature after one year through three years

8,415

Mature in more than three years

20,501

Mature in more than three years

20,650

Total

242,505

Total

$ 248,065

$ 251,015

- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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