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Note 8 - Common Stock - Common Stock Reserved for Future Issuance (Details) - shares | Sep. 30, 2015 | Dec. 31, 2014
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Employee Stock Option [Member] |  |
Common Stock, Reserved for Future Issuance (in shares) | 1,197,529 | 5,108,826
Warrant [Member] |  |
Common Stock, Reserved for Future Issuance (in shares) | 56,442,157 | 1,197,529
Series B Convertible Preferred Stock [Member] |  |
Common Stock, Reserved for Future Issuance (in shares) |  | 285,715
Common Stock, Reserved for Future Issuance (in shares) | 79,052,160 | 6,592,070

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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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