Note 1 - Basis of Presentation (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	May 25, 2017
Net Income (Loss) Attributable to Parent	$ (5,992,000)	$ (5,175,000)	$ (26,789,000)	$ (19,615,000)
Working Capital	$ 7,600,000		7,600,000
Net Cash Provided by (Used in) Operating Activities			$ (7,726,000)	$ (6,410,000)
Percentage of Future Quarterly Interest Payments	25.00%		25.00%		50.00%
Interest Payments in Stock			$ 433,000
Stock Issued During Period, Shares, New Issues			29,706
Debt Conversion, Original Debt, Amount			$ 2,250,000
Stock Issued During Period, Shares, Conversion of Convertible Securities			326,163
2017 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	357,500		357,500		357,500
Warrants and Rights Outstanding	$ 2,900,000		$ 2,900,000		$ 2,900,000