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Note 8 - Common Stock - Common Stock Reserved for Future Issuance (Details) - shares
Sep. 30, 2015
Dec. 31, 2014
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