Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) - Option Activity (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Option Activity [Abstract]
Outstanding options	466,556	286,188
Weighted average exercise price, outstanding	$ 9.19	$ 15.30
Weighted average remaining contractual term, outstanding	8 years 73 days
Vested and expected to vest as of September 30, 2014	429,781
Vested and expected to vest as of September 30, 2014	$ 8.18
Vested and expected to vest as of September 30, 2014	8 years 73 days
Exercisable as of September 30, 2014	244,648
Exercisable as of September 30, 2014	$ 13.32
Exercisable as of September 30, 2014	7 years 109 days
Granted	278,000
Granted	$ 4.58
Exercised	(3,000)
Exercised	$ 2.30
Cancelled/forfeited	(94,632)
Cancelled/forfeited	$ 14.32