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Note 6 - Convertible Debt and Derivative Liability (Details Textual)
3 Months Ended 9 Months Ended
Sep. 27, 2019
USD ($)
$ / shares
shares
Sep. 28, 2018
USD ($)
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Conversion, Converted Instrument, Amount       $ 338,573  
Bridge Loan     $ 4,470,380 4,470,380   $ 1,634,914
Derivative Liability, Total     210,762 210,762   $ 272,745
Embedded Derivative Financial Instruments [Member]            
Derivative Liability, Total     $ 188,118 188,118    
Warrant for Promissory Notes [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 68,237          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 6.21          
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, Convertible, Threshold Trading Days   20        
Conversion Shares, Sum of Number of Conversion Shares Plus Inducement Shares | shares   267,833        
Securities Purchase Agreements [Member] | Convertible Promissory Note [Member] | Investor 1 [Member]            
Debt Instrument, Increase (Decrease), Net, Total $ 120,000          
Debt Conversion, Converted Instrument, Shares Issued | shares 15,000          
Securities Purchase Agreements [Member] | Convertible Promissory Note [Member] | Investor 2 [Member]            
Debt Conversion, Converted Instrument, Shares Issued | shares     26,573      
Debt Conversion, Converted Instrument, Amount     $ 100,000      
Bridge Loan     $ 1,878,295 1,878,295    
Securities Purchase Agreements [Member] | Promissory Note [Member]            
Debt Instrument, Face Amount $ 847,500          
Debt Instrument, Interest Rate, Stated Percentage 8.00%          
Debt Instrument, Convertible, Threshold Trading Days 20          
Proceeds from Short-term Debt, Total $ 700,000          
Debt Instrument, Convertible, Number of Equity Instruments 8,858          
Debt Securities, Unrealized Gain (Loss), Total       $ (84,627)