Note 9 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Assumptions used in the valuation of the warrants issued in the Preferred Stock Offering are as follows:
Risk-free interest rate	0.78	%
Expected volatility	102.23	%
Expected life (in years)	5.0
Expected forfeiture rate	0.0	%
Expected dividend yield	0.00	%