Note 4 - Shareholders' Equity (Detail) (USD $)	3 Months Ended						1 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended				1 Months Ended		3 Months Ended	4 Months Ended	12 Months Ended				3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Mar. 31, 2012	Mar. 20, 2013	Dec. 31, 2012	Sep. 30, 2012	May 31, 2013 Subsequent Event [Member] Additional [Member]	Jun. 30, 2013 Subsequent Event [Member]	Mar. 31, 2013 Common Stock [Member] Series A Convertible Preferred Stock [Member]	Dec. 31, 2012 Common Stock [Member] Series A Convertible Preferred Stock [Member]	Mar. 31, 2013 Common Stock [Member]	Sep. 30, 2012 Series A Convertible Preferred Stock [Member] First Closing [Member]	Dec. 31, 2012 Series A Convertible Preferred Stock [Member] Second Closing [Member]	Dec. 31, 2012 Series A Convertible Preferred Stock [Member] Minimum [Member]	Jan. 31, 2013 Series A Convertible Preferred Stock [Member]	Sep. 30, 2012 Series A Convertible Preferred Stock [Member]	Mar. 31, 2013 Series A Convertible Preferred Stock [Member]	Dec. 31, 2012 Series A Convertible Preferred Stock [Member]	Dec. 31, 2012 Series A Convertible Preferred Stock [Member]	Dec. 31, 2012 First Closing [Member]	Mar. 31, 2013 Series B Convertible Preferred Stock [Member] Additional [Member]	Mar. 31, 2013 Series B Convertible Preferred Stock [Member] Original [Member]	Jun. 30, 2013 Series B Convertible Preferred Stock [Member]	Mar. 31, 2013 Series B Convertible Preferred Stock [Member]	Mar. 31, 2013 Warrant [Member] Minimum [Member]	Mar. 31, 2013 Warrant [Member] Maximum [Member]	Mar. 31, 2013 Amortization of Deferred Offering Costs [Member]	Mar. 31, 2013 Fixed Combination [Member]	Mar. 31, 2013 Maximum [Member]	Mar. 31, 2013 Maximum [Member]	Mar. 31, 2013 Maximum [Member]
Convertible Preferred Stock, Shares Reserved for Future Issuance												1,050.70039	1,449.29961
Preferred Stock, Dividend Rate, Percentage																6.00%								6.00%
Share Price (in Dollars per share)											$ 3.05	$ 1,000	$ 1,000	$ 4.91										$ 1,000
Term After Stockholder Approval is Obtained					5 days
Proceeds from Issuance of Convertible Preferred Stock (in Dollars)							$ 1,200,000											$ 2,000,000						$ 1,760,000
Debt Instrument, Convertible, Conversion Price (in Dollars per share)																		$ 1.9995	$ 1.9995
Conversion of Stock, Shares Converted		420,005						219,998									1,644.45186	1,250,000	855.54814				1,275.4
Number of Days After Closing																				12 months
Make Whole Payment, Per Share (in Dollars per share)																		$ 118	$ 118
Preferred Stock, Stated Value (in Dollars per share)																		$ 1,000	$ 1,000
Stock Issued During Period, Shares, Conversion of Convertible Securities	418,163																		427,878
Stock Issued During Period, Shares, New Issues (in Shares)										12,871	130,000													1,610
Dividends, Preferred Stock, Stock (in Dollars)															22,000
Preferred Stock Dividends, Shares															4,164
Conversion of Stock, Shares Issued																	822,421
Stock Dividends, Shares									50,307
Dividends, Preferred Stock (in Dollars)																	247,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights												213,945	724,825								528,000			275,000				171
Warrants, Term					5 years 6 months	5 years 6 months																		5 years 6 months
Period Following The Closing					6 months	6 months																		6 months
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)				9.50	2.364	9.50															3.05	9.50		3.49
Proceeds from Warrant Exercises (in Dollars)		993,000						520,000
Fair Value Assumptions, Expected Term																									5 years	5 years 73 days
Fair Value Assumptions, Expected Volatility Rate																									114.50%	116.00%
Fair Value Assumptions, Risk Free Interest Rate																									0.70%	0.80%
Class of Warrant or Right, Outstanding		1,526,904			1,219,479												2,600,000
Class of Warrant or Right, Change in Fair Value (in Dollars)		1,800,000
Derivative, Gain on Derivative (in Dollars)		1,800,000
Interest Expense (in Dollars)		$ 302,000	$ 6,000																								$ 280,000
Percent of Outstanding Common Stock																								19.99%					9.99%	4.99%	19.99%
Class of Warrant or Right, Number of Underlying Shares, Exercisable																						213,935		666,375
Percent of Stated Value		130.00%
Percent of the Three-day Volume Weighted Average Price		75.00%
VWAP, Number of Days		10 days
Percent of Warrants Outstanding		7.50%