Note 9 - Stockholders' Equity (Detail) (USD $)	0 Months Ended	1 Months Ended		3 Months Ended		1 Months Ended
	Feb. 26, 2013	Feb. 25, 2013	Feb. 28, 2013	Mar. 31, 2013	Dec. 31, 2012	Feb. 25, 2013 Series A Convertible Preferred Stock (Member)	Jan. 31, 2013 Series A Convertible Preferred Stock (Member)
Proceeds from Issuance or Sale of Equity (in Dollars)	$ 15,000,000			$ 0.4
Stock Issued During Period, Shares, New Issues		5,381,670				15,000.00422	120,516
Aggregate Offering Price (in Dollars)			25,000,000
Proceeds from Issuance of Common Stock (in Dollars)		6,800,000		6,711,173
Commission on Proceeds from ATM Shares, Percent		3.00%
Legal Fees (in Dollars)		50,000
Convertible Preferred Stock, Shares Reserved for Future Issuance	12,072,438
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)	6,036,219
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)	1.18			2.42	3.37
Stock Issued During Period, Shares, Conversion of Convertible Securities				8,018,112
Conversion of Stock, Shares Converted				9,963
Warrants and Rights Outstanding (in Dollars)				5,400,000
Dividends Payable, Current (in Dollars)				$ 4,600,000