Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) - Option Activity (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Option Activity [Abstract]
Outstanding as of	4,533,372	2,861,893
Outstanding as of	$ 1.03	$ 1.53
Outstanding as of	8 years 73 days
Vested and expected to vest as of March 31, 2014	4,094,707
Vested and expected to vest as of March 31, 2014	$ 0.91
Vested and expected to vest as of March 31, 2014	8 years 73 days
Exercisable as of March 31, 2014	2,152,493
Exercisable as of March 31, 2014	$ 1.68
Exercisable as of March 31, 2014	6 years 219 days
Granted	1,950,000
Granted	$ 0.42
Exercised	(5,000)
Exercised	$ 0.23
Cancelled/forfeited	(273,521)
Cancelled/forfeited	$ 2.00