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Note 8 - Common Stock - Common Stock Reserved for Future Issuance (Details)	Dec. 31, 2017 shares
Common Stock, Reserved for Future Issuance (in shares)	245,852,413
Warrant [Member]
Common Stock, Reserved for Future Issuance (in shares)	7,550,300
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)	171,349,733
Series D Convertible Preferred Stock [Member]
Common Stock, Reserved for Future Issuance (in shares)	66,666,666

X

- 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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- Details

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