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Note 4 - Investment Unit (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Jun. 30, 2018
Mar. 12, 2014
Apr. 30, 2018
Dec. 31, 2013
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 4.60 $ 4.60 $ 5.17
Fair Value Adjustment of Warrants       $ 2,500,000 $ 0    
Conversion of Preferred Stock to Common Stock [Member]              
Conversion of Stock, Shares Issued 9,324,177   1,235,219        
Series B Preferred Stock [Member]              
Stock Issued During Period, Shares, New Issues   184,797          
Warrant Issued to TETF [Member]              
Class of Warrant or Right, Purchase Percentage         80.00%    
Warrant Discount Rate         20.00%    
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.001     $ 0.001    
Promissory Note [Member]              
Contingent Debt         $ 4,500,000    
Contingent Debt, Interest Rate         8.00%