Note 11 - Warrants (Detail) (USD $)	1 Months Ended	3 Months Ended
	Sep. 30, 2009	Mar. 31, 2013	Mar. 31, 2012	Feb. 26, 2013	Dec. 31, 2012
Proceeds from Warrant Exercises		$ 200,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)				6,036,219
Proceeds from Issuance of Warrants	7,100,000
Proceeds from Issuance of Warrants, Net	6,300,000
Common Stock and Warrants Issued, Shares (in Shares)	2,018,153
Common Stock, Shares, Issued (in Shares)	1,009,076	51,497,856			37,967,708
Investment Warrants, Exercise Price (in Dollars per share)	$ 5.24
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	66 months	4 years 83 days
Common Stock Warrant Liability		3,635			4,283,932
Change in Fair Value of Common Stock Warrant Liability		4,280,297	77,600
Warrant Liability [Member]
Change in Fair Value of Common Stock Warrant Liability		$ 4,300,000
Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)		71,250