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Note 8 - Stockholders' Equity - Common Stock Reserved for Future Issuance (Details)
Mar. 31, 2017
shares
Common stock, reserved for future issuance (in shares) 92,895,777
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) 57,363,520
Warrant [Member]  
Common stock, reserved for future issuance (in shares) 30,656,243
Equity Incentive Plans [Member]  
Common stock, reserved for future issuance (in shares) 4,590,300