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Note 8 - Stockholders' Equity (Details) - Stock-based Compensation Expense (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Note 8 - Stockholders' Equity (Details) - Stock-based Compensation Expense [Line Items] |  |  |
Share-based compensation expense | $ 10,890 | $ 5,732 | $ 1,890
Impact on basic and diluted net loss per common share (in Dollars per share) | $ 0.67 | $ 0.47 | $ 0.31
Research and Development Expense [Member] |  |  |
Note 8 - Stockholders' Equity (Details) - Stock-based Compensation Expense [Line Items] |  |  |
Share-based compensation expense | 2,562 | 1,585 | 819
General and Administrative Expense [Member] |  |  |
Note 8 - Stockholders' Equity (Details) - Stock-based Compensation Expense [Line Items] |  |  |
Share-based compensation expense | $ 8,328 | $ 4,147 | $ 1,071

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- Definition Impact on basic and diluted net loss per common share. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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