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Note 6 - Notes Payable (Details Textual)
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended
Apr. 21, 2020
USD ($)
$ / shares
shares
Apr. 20, 2020
USD ($)
Mar. 19, 2020
USD ($)
shares
Feb. 05, 2020
USD ($)
$ / shares
shares
Sep. 28, 2018
USD ($)
$ / shares
shares
Jan. 31, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Feb. 27, 2019
USD ($)
shares
Nov. 30, 2018
USD ($)
Apr. 05, 2020
USD ($)
shares
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Jul. 15, 2019
USD ($)
$ / shares
shares
Mar. 05, 2020
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument, Face Amount                     $ 4,694,476   $ 4,694,476       $ 5,146,226  
Debt Instrument, Unamortized Discount, Total                     282,099   282,099       350,426  
Gain (Loss) on Extinguishment of Debt, Total                         (300,000)        
Payments for Penalties                         $ 247,327        
Dr. Schwartz [Member]                                    
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 1.43                                  
Stock Issued, Agreement, Not to be Transferred or Sold For Three Months (in shares) | shares 766,740                                  
Stock Issued, Agreement, Not to be Transferred or Sold for Six Months (in shares) | shares 766,741                                  
Investor of Promissory Note [Member]                                    
Stock Issued During Period, Shares, New Issues (in shares) | shares       46,875                            
Chief Executive Officer [Member]                                    
Stock Issued During Period, Shares, New Issues (in shares) | shares           50,000                        
Proceeds from Related Party Debt                 $ 370,000           $ 1,920,000      
Conversion of Bridge Loan to Common Stock [Member]                                    
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares                         170,000 55,859        
Conversion of Promissory Note Into Common Stock [Member]                                    
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 1.43                                  
Conversion of Promissory Note Into Common Stock [Member] | Dr. Schwartz [Member]                                    
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares 1,533,481                                  
Bridge Loan Warrants [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares         107,178                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares         $ 11.55                          
Dr. Schwartz Notes Warrants [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares                             22,129      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                             $ 8.36      
Warrant for Promissory Notes [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares             68,237                      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares             $ 6.21                      
Warrants Issued With Promissory Note, One [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares       94,631                            
Warrants Issued With Promissory Note, Two [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares                               92,700    
Warrants Issued With Promissory Note, Three [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares                   92,700                
Warrants Issued With Promissory Note [Member]                                    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares       $ 2.992                            
Convertible Promissory Note [Member]                                    
Debt Instrument, Face Amount                     1,721,776   $ 1,721,776       1,989,104  
Dr. Schwartz Note, One [Member]                                    
Debt Instrument, Face Amount                                   $ 370,000
Debt Instrument, Unamortized Discount, Total                                   $ 63,028
DrSchwartz Notes [Member]                                    
Debt Instrument, Face Amount $ 2,115,000         $ 2,115,000                 2,115,000  
Debt Instrument, Interest Rate, Stated Percentage           12.00%                        
Short-term Debt, Total 2,192,878         $ 2,115,000                        
Interest Payable $ 77,878                                  
DrSchwartz Notes [Member] | Conversion of Promissory Note Into Common Stock [Member]                                    
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares 1,533,481                                  
Second Promissory Note [Member]                                    
Debt Instrument, Face Amount       $ 1,450,000                            
Debt Instrument, Interest Rate, Stated Percentage       8.00%                            
Proceeds from Short-term Debt, Total       $ 400,000           $ 1,200,000                
Payments for Penalties                     0   0          
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares       $ 2.589                            
Borrowings Against Equity Line [Member]                                    
Debt Instrument, Face Amount                     $ 1,098,684   $ 1,098,684          
Debt Instrument, Interest Rate, Stated Percentage                     8.00%   8.00%          
Proceeds from Short-term Debt, Total                         $ 1,020,000          
Payments for Penalties                         247,327          
Repayments of Short-term Debt, Total                         1,459,973          
Bridge Notes [Member] | Convertible Promissory Note [Member]                                    
Debt Instrument, Face Amount         $ 2,297,727                          
Proceeds from Notes Payable, Total         $ 2,000,000                          
Stock Issued During Period, Shares, New Issues (in shares) | shares         65,000     16,667                    
Debt Instrument, Interest Rate, Stated Percentage         8.00%                          
Debt Instrument, Increase (Decrease), Net, Total               $ 344,659                    
Penalties Accrued                     $ 430,444   430,444          
Bridge Loan                     1,721,776   1,721,776          
Debt Instrument, Unamortized Discount, Total                     52,909   52,909          
Debt Instrument, Convertible, Threshold Trading Days         20                          
Conversion Shares, Sum of Number of Conversion Shares Plus Inducement Shares (in shares) | shares         267,833                          
Debt Conversion, Original Debt, Amount                         267,328 $ 238,573        
Securities Purchase Agreements [Member] | Promissory Note [Member]                                    
Debt Instrument, Face Amount     $ 300,000       $ 847,500                      
Stock Issued During Period, Shares, New Issues (in shares) | shares             8,857                      
Debt Instrument, Interest Rate, Stated Percentage             8.00%                      
Penalties Accrued                     196,167   196,167          
Debt Instrument, Unamortized Discount, Total                     229,190   229,190          
Short-term Debt, Total                     980,833   980,833          
Proceeds from Short-term Debt, Total             $ 700,000                      
Stock Issued During Period, Shares, Extension of Notes Payable (in shares) | shares     30,000                              
Gain (Loss) on Extinguishment of Debt, Total                       $ 300,000            
Payments for Penalties                       $ 0            
Securities Purchase Agreements [Member] | Second Promissory Note [Member]                                    
Penalties Accrued                     290,000   290,000          
Short-term Debt, Total                     1,450,000   1,450,000          
Paycheck Protection Program CARES Act [Member]                                    
Debt Instrument, Face Amount                     $ 541,867   $ 541,867        
Proceeds from Issuance of Long-term Debt, Total   $ 541,867