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Note 2 - Liquidity (Details Textual) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended
	Jan. 22, 2018	Jan. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Common Stock, Par or Stated Value Per Share	$ 0.001		$ 0.001	$ 0.001
Conversion From Series A Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Issued	21,006,918	21,006,918
Warrants Issued in Connection with the January 2018 Offering [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	15,000,000	15,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.80	$ 0.80
Class of Warrant or Right, Term	5 years
Warrants Issued in Connection with the January 2018 Offering [Member] | Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 1
Additional Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights		0.80
Underwriter Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 1
Underwriter Warrants [Member] | H.C Wainwright & Co., LLC [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 1
Class of Warrant or Right, Term	5 years
Underwriter Warrants [Member] | Maximum [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	750,000	750,000
Class of Warrant or Right, Term		5 years
January 2018 Offering [Member]
Stock Issued During Period, Shares, New Issues	15,000,000	15,000,000
Share Price	$ 0.80
Proceeds from Issuance or Sale of Equity, Total	$ 10.8	$ 10.8
January 2018 Offering [Member] | Additional Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	1,970,625

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- Definition

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