Note 2 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

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

	For the six months ended June 30,
	2013			2012
Risk-free interest rate	0.02	-	1.92%	0.75	-	1.49%
Expected dividend yield	0%			0%
Expected life (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 June 30,
Common Equivalent Securities	2013		2012
Warrants		10,377,995		6,065,495
Options		5,683,944		4,716,012
Total		16,061,939		10,781,507