Note 10 - Subsequent Event (Details Textual) $ / shares in Units, $ in Thousands		1 Months Ended
	Aug. 31, 2015 USD ($) $ / shares shares	Sep. 30, 2015 USD ($)	Aug. 31, 2015 USD ($) $ / shares shares	Jun. 30, 2014 $ / shares	Jun. 18, 2014 shares	Jan. 30, 2014 $ / shares shares
Subsequent Event [Member] | Employee Severance [Member]
Restructuring Costs | $		$ 245
Subsequent Event [Member] | Series A Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares	22,058,823		22,058,823
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.68		$ 0.68
Subsequent Event [Member] | Series B Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares	12,132,353		12,132,353
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.68		$ 0.68
Subsequent Event [Member] | Payment After Approval of Authorities [Member]
Proceeds from Warrant Exercises | $		$ 9,500
Subsequent Event [Member]
Proceeds from Convertible Debt | $			$ 15,000
Proceeds from Warrant Exercises | $	$ 5,500
Assumption of Change in Common Stock Shares Authorized | shares	350,000,000		350,000,000
Approval for Grant in Amount for Clinical Trial | $	$ 10,000		$ 10,000
Debt Instrument, Convertible, Conversion Price	$ 0.68		$ 0.68
Cashless Basis of Class of Warrant to be Exercised Per Share	$ 0.10		$ 0.10
Restructuring and Related Cost, Number of Positions Eliminated		15
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares					2,259,000	1,668,400
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 1.55		$ 2.81