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Note 8 - Stockholders' Equity (Details) - Common Shares Reserved | Dec. 31, 2013
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Note 8 - Stockholders' Equity (Details) - Common Shares Reserved [Line Items] |  |
Common stock reserved for future issuance | 22,023,232 |
Issuance Upon Exercise of Outstanding Stock Options [Member] |  |
Note 8 - Stockholders' Equity (Details) - Common Shares Reserved [Line Items] |  |
Common stock reserved for future issuance | 6,355,681 |
Employee Stock Option [Member] |  |
Note 8 - Stockholders' Equity (Details) - Common Shares Reserved [Line Items] |  |
Common stock reserved for future issuance | 1,797,694 |
Employee Stock Purchase Plan [Member] |  |
Note 8 - Stockholders' Equity (Details) - Common Shares Reserved [Line Items] |  |
Common stock reserved for future issuance | 16,651 |
Issuance of Common Stock Related to Convertible Notes [Member] |  |
Note 8 - Stockholders' Equity (Details) - Common Shares Reserved [Line Items] |  |
Common stock reserved for future issuance | 9,884,342 | [1]
Issuance Upon Exercise of Warrants [Member] |  |
Note 8 - Stockholders' Equity (Details) - Common Shares Reserved [Line Items] |  |
Common stock reserved for future issuance | 3,968,864 |
[1] | Assumes all interest payments are paid-in-kind through the maturity date.

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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