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Note 2 - Liquidity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
Jan. 22, 2018
Dec. 31, 2017
Nov. 01, 2017
Dec. 31, 2016
Jan. 07, 2016
Common Stock, Par or Stated Value Per Share   $ 0.001   $ 0.001  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights         478,200
Share Price     $ 1.44    
Subsequent Event [Member]          
Common Stock, Par or Stated Value Per Share $ 0.001        
Subsequent Event [Member] | Conversion From Series A Preferred Stock to Common Stock [Member]          
Conversion of Stock, Shares Issued 20,568,632        
Subsequent Event [Member] | 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        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.80        
Class of Warrant or Right, Term 5 years        
Subsequent Event [Member] | 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        
Subsequent Event [Member] | Underwriter Warrants [Member] | Maximum [Member]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 750,000        
Subsequent Event [Member] | January 2018 Offering [Member]          
Stock Issued During Period, Shares, New Issues 15,000,000        
Share Price $ 0.80        
Proceeds from Issuance or Sale of Equity $ 12        
Subsequent Event [Member] | January 2018 Offering [Member] | Additional Warrants [Member]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 1,970,625