Note 3 - Fair Value Measurements (Detail) - Assets and Liabilities Recorded at Fair Value (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets:
Available for Sale Securities at Fair Value	$ 186,128	$ 224,769
Derivative Financial Instruments, Liabilities [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets:
Foreign currency hedge contracts	13,300	9,783
Derivative Financial Instruments, Liabilities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Assets:
Foreign currency hedge contracts	13,300	9,783
Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets:
Available for Sale Securities at Fair Value	131,984	163,368
Money Market Funds [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Assets:
Available for Sale Securities at Fair Value	131,984	163,368
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets:
Available for Sale Securities at Fair Value	37,629	44,877
Corporate Debt Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Assets:
Available for Sale Securities at Fair Value	37,629	44,877
Commercial Paper [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets:
Available for Sale Securities at Fair Value	8,997	8,996
Commercial Paper [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Assets:
Available for Sale Securities at Fair Value	8,997	8,996
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets:
Available for Sale Securities at Fair Value	2,011	2,015
US Government Agencies Debt Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Assets:
Available for Sale Securities at Fair Value	2,011	2,015
US Treasury Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets:
Available for Sale Securities at Fair Value	5,507	5,513
US Treasury Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Assets:
Available for Sale Securities at Fair Value	5,507	5,513
Derivative Financial Instruments, Assets [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets:
Foreign currency hedge contracts		6,838
Derivative Financial Instruments, Assets [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Assets:
Foreign currency hedge contracts		6,838
Fair Value, Inputs, Level 1 [Member]
Assets:
Total	139,502	170,896
Fair Value, Inputs, Level 2 [Member]
Assets:
Total	46,626	60,711
Estimate of Fair Value, Fair Value Disclosure [Member]
Assets:
Total	$ 186,128	$ 231,607

- 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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