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Note 8 - Income Taxes (Details) - Income Tax Rate Reconciliation
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Income Tax Rate Reconciliation [Abstract] | |||
| U.S. statutory federal tax rate | 34.00% | 34.00% | 34.00% |
| State, net of federal benefit | 0.30% | ||
| Research and development credits | (3.60%) | (0.50%) | |
| Stock-based compensation | (13.70%) | 0.10% | 5.60% |
| Foreign income at lower rates | (33.80%) | (28.40%) | (31.80%) |
| Changes in valuation allowance | 16.80% | 7.00% | (6.10%) |
| Litigation reserves and other | 1.00% | 2.80% | 1.90% |
| Effective tax rate | 4.60% | 11.90% | 3.10% |