Note 5 - Convertible Debentures (Details Textual) - USD ($)			1 Months Ended		3 Months Ended	12 Months Ended
	Feb. 29, 2016	Feb. 16, 2016	Feb. 29, 2016	Aug. 31, 2015	Dec. 31, 2015	Jun. 30, 2016	Jun. 30, 2015
Series A Warrant [Member] | Thirty-Year Debentures [Member]
Residual Fair Value of Warrants				$ 3,385,000
Series A Warrant [Member] | Other Expense [Member]
Derivative, Gain (Loss) on Derivative, Net	$ (149,000)
Series A Warrant [Member]
Fair Value Assumptions, Expected Dividend Rate	0.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 8		$ 8	$ 13.60
Warrant Expiration Period				5 years 182 days
Fair Value Assumptions, Expected Term	5 years
Fair Value Assumptions, Expected Volatility Rate	91.00%
Fair Value Inputs, Discount Rate	1.20%
Class of Warrant or Right, Outstanding				404,412		404,412
Warrants [Member]
Fair Value Assumptions, Expected Term			5 years
Fair Value Assumptions, Expected Volatility Rate			91.00%
Fair Value Inputs, Discount Rate			1.20%
Series B Warrant [Member] | Thirty-Year Debentures [Member]
Residual Fair Value of Warrants				$ 897,000
Class of Warrant or Right, Cancelled During Period,Value						$ 159,000
Series B Warrant [Member]
Fair Value Assumptions, Expected Dividend Rate						0.00%
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				606,618
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 13.60
Warrant Expiration Period				1 year 180 days
Fair Value Assumptions, Expected Term						1 year 73 days
Fair Value Assumptions, Expected Volatility Rate						88.00%
Fair Value Inputs, Discount Rate						0.57%
Warrants Not Settleable in Cash, Fair Value Disclosure		$ 25,000				$ 33,000
Class of Warrant or Right, Outstanding				222,427		222,427
Shares Issued for Cashless Exercise of Warrants		125,000				106,711
Class of Warrant or Right, Cancelled During Period,Value		$ 159,000
Convertible Debt [Member] | Debt Issuance Cost Allocated to Debt [Member]
Debt Issuance Costs, Net	$ 183,000		$ 183,000
Convertible Debt [Member] | Debt Issuance Cost Allocated to Equity [Member]
Debt Issuance Costs, Net	37,000		37,000
Convertible Debt [Member]
Debt Instrument, Face Amount	$ 12,500,000		$ 12,500,000
Debt Conversion, Convertible Shares	3,676,471		3,676,471
Debt Instrument, Term			3 years
Debt Instrument, Interest Rate, Stated Percentage	22.00%		22.00%
Proceeds from Convertible Debt			$ 12,319,000
Warrants Not Settleable in Cash, Fair Value Disclosure	$ 4,434,000		4,434,000
Convertible Debt	1,061,000		1,061,000
Debt Instrument, Unamortized Discount	$ 11,258,000		11,258,000
Amortization of Debt Discount (Premium)						$ 1,407,000
Amortization of Debt Issuance Costs						23,000
Interest Expense						1,031,000
Debentures, Beneficial Conversion Feature [Member]
Debt Instrument, Convertible, Beneficial Conversion Feature			6,824,000
Thirty-Year Debentures [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				1,102,942
Debt Instrument, Term				30 years
Proceeds from Convertible Debt				$ 4,720,000
Convertible Debt				0
Debt Instrument, Unamortized Discount				4,720,000
Amortization of Debt Discount (Premium)		4,648,000				4,720,000
Amortization of Debt Issuance Costs		$ 765,000				777,000
Potential Proceed from Issuance of Convertible Debt				15,000,000
Gross Proceeds from Convertible Debt				5,500,000		5,500,000
Registration Payment Arrangement, Gains and Losses						1,100,000
Registration Payment					$ 220,000
Repayments of Debt			7,500,000			7,500,000
Gain (Loss) on Extinguishment of Debt						$ (795,000)
Payment After Approval of Authorities [Member]
Potential Proceed from Issuance of Convertible Debt				9,500,000
Thirty-Year Debentures, Beneficial Conversion Feature [Member]
Debt Instrument, Convertible, Beneficial Conversion Feature				438,000
Fair Value Assumptions, Expected Dividend Rate						0.00%	0.00%
Gross Proceeds from Financing Transaction			$ 15,000,000
Stock Issued During Period, Shares, New Issues			735,294
Sale of Stock, Price Per Share	$ 3.40		$ 3.40
Stock Issued During Period, Value, New Issues			$ 2,500,000			$ 2,464,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	3,529,412		3,529,412
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 8		$ 8
Warrant Expiration Period			5 years
Number of Warrants, Percentage of Shares Issued or to Be Issued			80.00%
Debt Issuance Costs, Net	$ 220,000		$ 220,000			$ 160,000
Period after Benchmark Reached			15 days
Net Cash and Short-Term Investment Benchmark	$ 2,100,000		$ 2,100,000
Duration of Moving Average Price			20 days
Percent of Stock Price			125.00%
Consecutive Days of Weighted Average Trading Price			10 days
Share Price	$ 4		$ 4
Fair Value Assumptions, Expected Term						5 years	5 years
Fair Value Assumptions, Expected Volatility Rate						80.00%	75.00%
Proceeds from Convertible Debt						$ 18,000,000
Convertible Debt						2,489,000
Debt Instrument, Unamortized Discount						9,851,000
Amortization of Debt Discount (Premium)						6,127,000
Amortization of Debt Issuance Costs						800,000
Interest Expense						1,864,000	14,000
Approval for Grant in Amount for Clinical Trial				$ 10,000,000
Registration Payment Arrangement, Gains and Losses						(1,100,000)
Derivative, Gain (Loss) on Derivative, Net						3,395,000
Gain (Loss) on Extinguishment of Debt						$ (795,000)