Note 3 - Fair Value Measurements (Detail) - Assets and Liabilities Recorded at Fair Value (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financial assets:
Available for Sale Securities at Fair Value	$ 176,739	$ 224,769
Derivative Financial Instruments, Liabilities [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial liabilities:
Foreign currency hedge contracts	4,446	9,783
Derivative Financial Instruments, Liabilities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial liabilities:
Foreign currency hedge contracts	4,446	9,783
Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial assets:
Available for Sale Securities at Fair Value	128,962	163,368
Money Market Funds [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets:
Available for Sale Securities at Fair Value	128,962	163,368
Certificates of Deposit [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial assets:
Available for Sale Securities at Fair Value	20,000
Certificates of Deposit [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets:
Available for Sale Securities at Fair Value	20,000
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial assets:
Available for Sale Securities at Fair Value	23,772	44,877
Corporate Debt Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets:
Available for Sale Securities at Fair Value	23,772	44,877
Commercial Paper [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial assets:
Available for Sale Securities at Fair Value		8,996
Commercial Paper [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets:
Available for Sale Securities at Fair Value		8,996
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial assets:
Available for Sale Securities at Fair Value	2,004	2,015
US Government Agencies Debt Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets:
Available for Sale Securities at Fair Value	2,004	2,015
US Treasury Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial assets:
Available for Sale Securities at Fair Value	2,001	5,513
US Treasury Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets:
Available for Sale Securities at Fair Value	2,001	5,513
Derivative Financial Instruments, Assets [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial assets:
Foreign currency hedge contracts	562	6,838
Derivative Financial Instruments, Assets [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets:
Foreign currency hedge contracts	562	6,838
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Total	132,967	170,896
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Total	44,334	60,711
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets:
Total	$ 177,301	$ 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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