Note 15 - Stock-Based Compensation (Detail) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		24 Months Ended		24 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2011 Stock Options [Member]	Sep. 30, 2012 Restricted Stock [Member]	Sep. 30, 2011 Restricted Stock [Member]	Sep. 30, 2012 Restricted Stock [Member]	Sep. 30, 2011 Restricted Stock [Member]	Sep. 30, 2012 Consultants [Member]	Sep. 30, 2012 Employees and Directors [Member] General and Administrative Expense [Member]	Sep. 30, 2012 Employees and Directors [Member]	Sep. 30, 2011 Employees and Directors [Member]	Sep. 30, 2012 Employees and Directors [Member]	Sep. 30, 2011 Employees and Directors [Member]	Sep. 30, 2012 General and Administrative Expense [Member]	Sep. 30, 2011 General and Administrative Expense [Member]	Sep. 30, 2012 General and Administrative Expense [Member]	Sep. 30, 2011 General and Administrative Expense [Member]	Sep. 30, 2012 Research and Development Expense [Member]	Sep. 30, 2011 Research and Development Expense [Member]	Sep. 30, 2012 Research and Development Expense [Member]	Sep. 30, 2011 Research and Development Expense [Member]	Dec. 31, 2012 Minimum [Member]	Sep. 30, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]	Sep. 30, 2012 Maximum [Member]
Share-based Compensation	$ 9,000	$ 4,000	$ 1,028,814	$ 1,242,450	$ 1,000	$ 2,000	$ 12,000	$ 20,000	$ 31,000	$ 500	$ 706,000	$ 265,000	$ 260,000	$ 919,000	$ 758,000	$ 193,000	$ 242,000	$ 56,000	$ 698,000	$ 72,000	$ 18,000	$ 213,000	$ 60,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	1,424,000		1,424,000			5,000		5,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition			255 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 0.06	$ 0.55	$ 0.11	$ 0.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	0	198,000	12,000	279,000
Proceeds from Stock Options Exercised	$ 13,000	$ 131,000	$ 13,110	$ 185,424
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)	60,000		60,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)																									2.00		2.20
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																								6 months		1 year