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Note 4 - Investment Unit (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 03, 2018
Mar. 12, 2014
Dec. 31, 2013
Mar. 31, 2018
Dec. 31, 2019
Mar. 31, 2020
Dec. 31, 2018
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 1.45 $ 1.45 $ 2.36
Fair Value Adjustment of Warrants     $ 2,500,000   $ 0    
Conversion of Preferred Stock to Common Stock [Member]              
Conversion of Stock, Shares Issued (in shares) 1,235,219     9,324,177      
Series B Preferred Stock [Member]              
Stock Issued During Period, Shares, New Issues (in shares)   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 (in dollars per share)   $ 0.001       $ 0.001  
Promissory Note [Member]              
Contingent Debt           $ 4,500,000  
Contingent Debt, Interest Rate           8.00%