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Note 5 - Convertible Preferred Stock, Common Stock and Common Stock Warrants (Details Textual) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 22, 2018	Jan. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stock Issued During Period, Shares, Conversion of Convertible Securities		8,306,278
Common Stock Dividends, Shares		1,032,219
Stock Issued During Period, Shares, Make-whole Adjustment		11,668,421
Dividends, Make-whole Adjustment		$ 8,200,000			$ (8,167,895)
Class of Warrant or Right, Exercised					0
Warrant [Member]
Class of Warrant or Rights, Expired					411,721
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		$ 1
Option Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		2,250,000
Additional Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 0.80
Class of Warrant or Right, Granted		1,970,625
Underwriter Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 1
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
Proceeds from Issuance or Sale of Equity, Total	$ 10,800,000	$ 10,800,000
Stock Issued During Period, Shares, Issued for Services		2,250,000
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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