Note 7 - Common Stock Reserved for Future Issuance (Details)	Mar. 31, 2016 shares
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)	30,460,663
Warrant [Member]
Common Stock, Reserved for Future Issuance (in shares)	52,777,569
Employee Stock Option [Member]
Common Stock, Reserved for Future Issuance (in shares)	1,722,529
Common Stock, Reserved for Future Issuance (in shares)	85,246,475