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Note 6 - Convertible Debt and Derivative Liability (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Sep. 28, 2018
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivative Liability, Total   $ 541,599 $ 541,599   $ 272,745
Debt Conversion, Converted Instrument, Amount     238,573  
Embedded Derivative Financial Instruments [Member]          
Unrealized Gain (Loss) on Derivatives     (231,348)    
Derivative Liability, Total   504,092 504,092    
Securities Purchase Agreements [Member] | Convertible Promissory Note [Member]          
Debt Instrument, Face Amount $ 2,297,727        
Debt Instrument, Interest Rate, Stated Percentage 8.00%        
Debt Instrument, Term 1 year        
Debt Instrument, Convertible, Conversion Price, Percentage of Lowers Volume-weighted Average Price of Common Stock 70.00%        
Debt Instrument, Convertible, Threshold Trading Days 20        
Conversion Shares, Sum of Number of Conversion Shares Plus Inducement Shares 2,678,328        
Securities Purchase Agreements [Member] | Convertible Promissory Note [Member] | Maximum [Member]          
Debt Instrument, Convertible, Conversion Price $ 1        
Bridge Notes [Member]          
Debt Conversion, Original Debt, Amount   148,573      
Debt Conversion, Converted Instrument, Amount   398,734      
Convertible Debt, Total   $ 325,278 $ 325,278