Note 5 - Marketable Securities (Detail) - Portfolio of Marketable Securities (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2012	Dec. 31, 2011
Available-for-sale securities:
Available-for-sale securities cost	$ 249,254	$ 317,236
Available-for-sale securities gross unrealized gains	464	622
Available-for-sale securities gross unrealized losses	(227)	(3)
Available-for-sale securities estimated fair value	249,491	317,855
Cash equivalents cost	(61,284)	(2,914)
Cash equivalents unrealized gains	(1)
Cash equivalents estimated fair value	(61,284)	(2,914)
Cash equivalents unrealized losses	1
Marketable securities cost	187,970	314,322
Marketable securities unrealized gains	463	622
Marketable securities unrealized losses	(226)	(3)
Marketable securities estimated fair value	188,207	314,941
Short-term Deposits [Member]
Available-for-sale securities:
Available-for-sale securities cost	44,592	3,029
Available-for-sale securities estimated fair value	44,592	3,029
Mutual Funds [Member]
Available-for-sale securities:
Available-for-sale securities cost	10,000
Available-for-sale securities gross unrealized gains	135
Available-for-sale securities estimated fair value	10,135
US Treasury Securities [Member]
Available-for-sale securities:
Available-for-sale securities cost	117,794	309,189
Available-for-sale securities gross unrealized gains	253	593
Available-for-sale securities gross unrealized losses	(7)	(3)
Available-for-sale securities estimated fair value	118,040	309,779
US Government Agencies Debt Securities [Member]
Available-for-sale securities:
Available-for-sale securities cost	2,501	3,505
Available-for-sale securities gross unrealized gains	3	21
Available-for-sale securities estimated fair value	2,504	3,526
Securities (Assets) [Member]
Available-for-sale securities:
Available-for-sale securities cost	4,720
Available-for-sale securities gross unrealized gains	43
Available-for-sale securities gross unrealized losses	(208)
Available-for-sale securities estimated fair value	4,555
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Available-for-sale securities:
Available-for-sale securities cost	35,805
Available-for-sale securities gross unrealized gains	21
Available-for-sale securities estimated fair value	35,826
Corporate Debt Securities [Member]
Available-for-sale securities:
Available-for-sale securities cost	33,842	1,513
Available-for-sale securities gross unrealized gains	9	8
Available-for-sale securities gross unrealized losses	(12)
Available-for-sale securities estimated fair value	$ 33,839	$ 1,521

Available For Sale Securities Classified As Cash Equivalents

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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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No definition available.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer.

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The increase (decrease), resulting in a gain, in the difference between the fair value and the carrying value, or in the comparative fair values, of securities held at each balance sheet date, that was included in earnings for the period.

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The increase (decrease), resulting in a loss, in the difference between the fair value and the carrying value, or in the comparative fair values, of securities held at each balance sheet date, that was included in earnings for the period.

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