Note 3 - Fair Value of Financial Instruments (Detail) - Summary of Black-Scholes model to measure accrued warrant liability and stock options: (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Stock Price (in Dollars per share)	$ 1.96
Volatility	82.31%
Annual rate of quarterly dividends	0.00%
Minimum [Member]
Stock Price (in Dollars per share)	$ 1.96	$ 1.33
Exercise Price (in Dollars per share)	$ 1.60	$ 1.60
Term in years	350 days	1 year 32 days
Volatility	85.16%	82.75%
Annual rate of quarterly dividends	0.00%	0.00%
Discount rate- bond equivalent yield	0.13%	0.17%
Maximum [Member]
Exercise Price (in Dollars per share)	$ 5.00	$ 5.00
Term in years	2 years 102 days	2 years 149 days
Volatility	92.85%	95.91%
Discount rate- bond equivalent yield	0.28%	0.29%