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Note 8 - Common Stock - Common Stock Reserved for Future Issuance (Details) | Dec. 31, 2018 shares
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Common Stock, Reserved for Future Issuance (in shares) | 265,565,942
Common Stock [Member] |
Common Stock, Reserved for Future Issuance (in shares) | 17,412,300
Warrant [Member] |
Common Stock, Reserved for Future Issuance (in shares) | 57,348,383
Series B Convertible Preferred Stock [Member] |
Common Stock, Reserved for Future Issuance (in shares) | 285,714
Series C Convertible Preferred Stock [Member] |
Common Stock, Reserved for Future Issuance (in shares) | 143,349,733
Series E Convertible Preferred Stock [Member] |
Common Stock, Reserved for Future Issuance (in shares) | 47,169,812

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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