Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used

	For the nine months ended September 30,
	2013					2012
Risk-free interest rate		0.02	-	1.92	%		0.71	-	1.49	%
Expected dividend yield				0	%				0	%
Expected life (in years)		5	-	7.3			5	-	6
Expected volatility		80.71	-	89.66	%		86.58	-	92.24	%

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	As of September 30,
Common Equivalent Securities	2013		2012
Warrants		10,534,245		6,065,495
Options		5,608,912		4,816,012
Total		16,143,157		10,881,507