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Note 11 - Stock-based Compensation (Details) - Information Regarding Outstanding Restricted Stock Units (Restricted Stock Units (RSUs) [Member], USD $)
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12 Months Ended | |
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Dec. 31, 2014
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Dec. 31, 2012
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Restricted Stock Units (RSUs) [Member]
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| Note 11 - Stock-based Compensation (Details) - Information Regarding Outstanding Restricted Stock Units [Line Items] | ||
| Outstanding at December 31, 2013 | 3,209,567 | |
| Outstanding at December 31, 2013 (in Dollars per share) | $ 11.69 | |
| Granted | 2,878,836 | |
| Granted (in Dollars per share) | $ 13.99 | |
| Vested | (1,098,924) | |
| Vested (in Dollars per share) | $ 12.61 | |
| Canceled | (199,857) | |
| Canceled (in Dollars per share) | $ 11.92 | |
| Outstanding at December 31, 2014 | 4,789,622 | 3,209,567 |
| Outstanding at December 31, 2014 (in Dollars per share) | $ 12.85 | $ 11.69 |
| Expected to vest in the future as of December 31, 2014 | 4,712,501 |