Note 4 - Equity, Stock Plan and Warrants (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock Issued During Period, Shares, Restricted Stock Award, Gross	3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	371,718
Stock Issued During Period, Shares, Other	21,622
Stock Issued During Period, Shares, Issued for Noncash Consideration	137,778
Shares Held in Employee Stock Option Plan, Allocated	2,300,001
Shares held in Employee Stock Option Plan, Suspense Shares	3,071
Share-based Compensation (in Dollars)	$ 631,414	$ 615,619
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)	2,400,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	295 days
Options vested in period	0.4
Class of Warrant or Rights, Weighted Average Exercise Price, Outstanding (in Dollars per share)	$ 6.56
Selling, General and Administrative Expenses [Member]
Share-based Compensation (in Dollars)	300,000	300,000
Research and Development Expense [Member]
Share-based Compensation (in Dollars)	$ 300,000	$ 300,000