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Note 14 - Convertible Notes Payable (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Jul. 10, 2020
Jun. 29, 2020
Jun. 12, 2020
Jun. 10, 2020
May 06, 2020
Mar. 12, 2020
Feb. 13, 2020
Jan. 13, 2020
Jul. 10, 2019
Jul. 31, 2020
Sep. 30, 2020
Mar. 30, 2020
Sep. 23, 2015
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                         8,681
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                       $ 12 $ 28.80
Payments of Stock Issuance Costs, Commitment Fees                 $ 50,000        
Stock Issued During Period, Shares, Issued for Due Diligence Fee (in shares)   17,071     14,368       33,334        
Stock Issued During Period, Value, Issued for Due Diligence Fee   $ 100,000     $ 133,333       $ 400,000        
Payments of Stock Issuance Costs, Banker Fees                 193,500        
Payments of Stock Issuance Costs, Legal Fees                 71,330        
Class of Warrant or Right, Recorded as Debt Discount                 $ 595,662        
Share Price (in dollars per share)     $ 5.20     $ 6.08              
Stock Returned During the Period, Shares, Commitment Fee (in shares)                   75,000      
Shares Issued, Price Per Share (in dollars per share)   $ 5.86     $ 9.28                
Conversion of Senior Secured Convertible Note to Common Stock [Member]                          
Debt Conversion, Original Debt, Amount       $ 3,789,000                  
Debt Conversion, Converted Instrument, Shares Issued (in shares)       728,654                  
Investor Warrant [Member]                          
Warrants and Rights Outstanding, Term (Year)   5 years     5 years       5 years        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   178,125     237,500       250,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 9.28     $ 9.28       $ 12        
Repayments of Convertible Debt                   $ 2,415,000      
Warrants and Rights Outstanding         $ 876,937                
Payments of Debt Issuance Costs                   1,218,163      
Secured Redeemable Convertible Note [Member] | February 2020 Note [Member]                          
Debt Instrument, Convertible, Conversion Price (in dollars per share)           $ 5.20 $ 9.20            
The Note [Member] | Senior Secured Convertible Note [Member]                          
Debt Instrument, Face Amount                 $ 3,060,000        
Proceeds from Debt, Net of Issuance Costs                 2,550,000        
Debt Instrument, Unamortized Discount, Total                 510,000        
Debt Instrument, Periodic Payment, Principal due in 180 Days                 918,000        
Debt Instrument, Periodic Payment, Principal due in 270 Days                 $ 1,071,000        
Debt Instrument, Convertible, Conversion Price (in dollars per share)                 $ 12        
Amended Note [Member] | Senior Secured Convertible Note [Member]                          
Debt Instrument, Face Amount           $ 3,789,000              
Debt Instrument, Unamortized Discount, Total           $ 641,215              
Debt Instrument, Convertible, Conversion Price (in dollars per share)           $ 5.20              
Interest Expense, Debt, Total           $ 729,000              
Debt Instrument, Convertible, Beneficial Conversion Feature, Per Share (in dollars per share)           $ 0.88              
Long-term Debt, Total       $ 0                  
January 2020 Note [Member] | Secured Redeemable Convertible Note [Member]                          
Debt Instrument, Face Amount               $ 157,000          
Debt Instrument, Convertible, Conversion Price (in dollars per share)               $ 12          
Debt Instrument, Interest Rate, Stated Percentage               10.00%          
Stock Issued During Period, Shares, Commitment Fees (in shares)               81,250          
Debt Instrument, Fee Amount               $ 75,000          
Debt Instrument, Covenant, Shares to be Paid, Commitment Fee, Repaid Prior to Maturity (in shares)               6,250          
Repayments of Convertible Debt     $ 211,984                    
February 2020 Note [Member] | Secured Redeemable Convertible Note [Member]                          
Debt Instrument, Face Amount             $ 126,000            
Debt Instrument, Interest Rate, Stated Percentage             10.00%            
Stock Issued During Period, Shares, Commitment Fees (in shares)             6,250            
Debt Instrument, Fee Amount             $ 57,500            
Repayments of Convertible Debt $ 170,442                        
Debt Instrument, Deemed Dividend Expense           $ 70,998              
Legal Fees             $ 6,000            
February 2020 Note [Member] | Secured Redeemable Convertible Note [Member] | Minimum [Member]                          
Debt Instrument, Convertible, Premium Payment Percentage             10.00%            
February 2020 Note [Member] | Secured Redeemable Convertible Note [Member] | Maximum [Member]                          
Debt Instrument, Convertible, Premium Payment Percentage             30.00%            
May 2020 Note [Member] | Secured Redeemable Convertible Note [Member]                          
Debt Instrument, Face Amount         2,415,000                
Proceeds from Debt, Net of Issuance Costs         $ 2,100,000                
Debt Instrument, Convertible, Conversion Price (in dollars per share)         $ 9.28                
Debt Instrument, Periodic Payment, Principal         $ 268,333                
Placement Fee, Percent of Aggregate Gross Proceeds         7.00%                
June 2020 Note [Member] | Secured Redeemable Convertible Note [Member]                          
Debt Instrument, Face Amount   $ 1,811,250                      
Proceeds from Debt, Net of Issuance Costs   $ 1,575,000                      
Debt Instrument, Convertible, Conversion Price (in dollars per share)   $ 9.28                      
Repayments of Convertible Debt                     $ 1,811,250    
Debt Instrument, Periodic Payment, Principal   $ 201,250                      
Placement Fee, Percent of Aggregate Gross Proceeds   7.00%                      
Amortization of Debt Issuance Costs and Discounts, Total                   $ 957,919