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Note 2 - Cash, Cash Equivalents and Investments (Details) - Current Assets Fair Market Value (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Cash | $ 62,625 | $ 59,145 |
| Money market funds | 35,588 | 15,959 |
| U.S. treasuries and government agency bonds | 128,126 | 85,521 |
| Total cash, cash equivalents and investments | 236,199 | 172,380 |
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Auction Rate Securities [Member]
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Auction-rate securities backed by student-loan notes | $ 9,860 | $ 11,755 |