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Note 8 - Common Stock - Common Stock Reserved for Future Issuance (Details) - shares
Jun. 30, 2015
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) 21,126,760
Warrant [Member]  
Common Stock, Reserved for Future Issuance (in shares) 56,442,157
Employee Stock Option [Member]  
Common Stock, Reserved for Future Issuance (in shares) 1,197,529
Common Stock, Reserved for Future Issuance (in shares) 79,052,160