Note 3 - Fair Value Measurements (Detail) - Summary of Black-Scholes model to measure accrued warrant liability and stock options: (USD $)	12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Oct. 31, 2012	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2011 Minimum [Member]	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2011 Maximum [Member]	Dec. 31, 2010 Maximum [Member]
Stock Price (in Dollars per share)	$ 4.45	$ 2.48	$ 0.005			$ 1.33	$ 2.86
Exercise Price (in Dollars per share)	$ 5.00	$ 3.00		$ 1.60	$ 1.60	$ 5.00	$ 5.00
Term in years	2 years 6 months	2 years 186 days		1 year 32 days	1 year 211 days	2 years 149 days	2 years 83 days
Volatility	69.36%	79.70%		82.75%	66.68%	95.91%	71.55%
Annual rate of quarterly dividends						0.00%	0.00%	0.00%
Discount rate- bond equivalent yield				0.17%	0.20%	0.29%	0.28%