Note 9 - Stockholders' Equity (Details) - Assumptions Used in the Valuation of the Warrants Associated with Preferred Stock Offering	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Note 9 - Stockholders' Equity (Details) - Assumptions Used in the Valuation of the Warrants Associated with Preferred Stock Offering [Line Items]
Risk-free interest rate	2.75%	0.85%
Expected volatility	100.72%	83.41%
Expected life (in years)	10 years	5 years 3 months
Expected forfeiture rate	5.00%	5.00%
Expected dividend yield	0.00%	0.00%
Warrant [Member]
Note 9 - Stockholders' Equity (Details) - Assumptions Used in the Valuation of the Warrants Associated with Preferred Stock Offering [Line Items]
Risk-free interest rate	0.78%
Expected volatility	102.23%
Expected life (in years)	5 years
Expected forfeiture rate	0.00%
Expected dividend yield	0.00%