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Note 2 - Liquidity (Details Textual)
$ / shares in Units, $ in Millions
1 Months Ended
Jun. 14, 2018
Jan. 22, 2018
USD ($)
$ / shares
shares
Jan. 31, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
$ / shares
Dec. 31, 2017
$ / shares
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 | shares   21,006,918 21,006,918    
Maximum [Member] | Reverse Stock Split [Member ]          
Stockholders' Equity Note, Stock Split, Conversion Ratio 15        
Minimum [Member] | Reverse Stock Split [Member ]          
Stockholders' Equity Note, Stock Split, Conversion Ratio 2        
Warrants Issued in Connection with the January 2018 Offering [Member]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares   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  
Warrants Issued in Connection with the January 2018 Offering [Member] | Minimum [Member]          
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 0.80  
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 | shares   750,000 750,000    
Class of Warrant or Right, Term     5 years    
January 2018 Offering [Member]          
Stock Issued During Period, Shares, New Issues | shares   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 | shares   1,970,625