Note 9 - Common Stock (Details) - Common Stock Reserved for Future Issuance	Dec. 31, 2013
Class of Stock [Line Items]
Common Stock, Reserved for Future Issuance	14,406,898
Warrant [Member]
Class of Stock [Line Items]
Common Stock, Reserved for Future Issuance	8,292,226
Employee Stock Option [Member]
Class of Stock [Line Items]
Common Stock, Reserved for Future Issuance	1,197,529
Series A Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Common Stock, Reserved for Future Issuance	202,857
Series B Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Common Stock, Reserved for Future Issuance	4,714,286