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Note 12 - Convertible Notes Payable (Details Textual) - USD ($)
1 Months Ended 6 Months Ended
Jul. 20, 2020
Jul. 10, 2020
Jun. 30, 2020
Jun. 29, 2020
Jun. 12, 2020
May 06, 2020
Mar. 12, 2020
Feb. 13, 2020
Jan. 13, 2020
Jul. 10, 2019
Jul. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Feb. 14, 2020
Nov. 11, 2015
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                           $ 0.65 $ 3.60
Payments of Stock Issuance Costs, Commitment Fees                   $ 50,000          
Stock Issued During Period, Shares, Issued for Due Diligence Fee (in shares)       136,575   114,943       266,667          
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)             $ 0.76                
Repayments of Convertible Debt                       $ 211,984    
Shares Issued, Price Per Share (in dollars per share)       $ 0.7322   $ 1.16                  
Subsequent Event [Member]                              
Repayments of Convertible Debt $ 4,200,000                            
Stock Returned During the Period, Shares, Commitment Fee (in shares)                     600,000        
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)     5,829,225                        
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)       1,425,000   1,900,000       2,000,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 1.16   $ 1.16       $ 1.50          
Warrants and Rights Outstanding       $ 511,402   $ 876,937                  
Class of Warrant or Right, Percentage of Placement Fee from Gross Proceeds from Issuance of Warrants       7.00%                      
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)                   $ 1.50          
Debt Instrument, Convertible, Percent                   25.00%          
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)             $ 0.65             $ 0.65  
Interest Expense, Debt, Total             $ 729,000                
Debt Instrument, Convertible, Beneficial Conversion Feature, Per Share (in dollars per share)             $ 0.11                
Long-term Debt, Total     $ 0                 $ 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)                 $ 1.50            
Debt Instrument, Interest Rate, Stated Percentage                 10.00%            
Stock Issued During Period, Shares, Commitment Fees (in shares)                 650,000            
Debt Instrument, Fee Amount                 $ 75,000            
Debt Instrument, Covenant, Shares to be Paid, Commitment Fee, Repaid Prior to Maturity (in shares)                 50,000            
Legal Fees                 $ 7,000            
Repayments of Convertible Debt         $ 211,984                    
January 2020 Note [Member] | Secured Redeemable Convertible Note [Member] | Minimum [Member]                              
Debt Instrument, Convertible, Premium Payment Percentage                 10.00%            
January 2020 Note [Member] | Secured Redeemable Convertible Note [Member] | Maximum [Member]                              
Debt Instrument, Convertible, Premium Payment Percentage                 30.00%            
February 2020 Note [Member] | Secured Redeemable Convertible Note [Member]                              
Debt Instrument, Face Amount               $ 126,000              
Debt Instrument, Convertible, Conversion Price (in dollars per share)             $ 0.65 $ 1.15              
Debt Instrument, Interest Rate, Stated Percentage               10.00%              
Stock Issued During Period, Shares, Commitment Fees (in shares)               50,000              
Debt Instrument, Fee Amount               $ 57,500              
Legal Fees               $ 6,000              
Debt Instrument, Deemed Dividend Expense             $ 70,998                
February 2020 Note [Member] | Secured Redeemable Convertible Note [Member] | Subsequent Event [Member]                              
Repayments of Convertible Debt   $ 170,442                          
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)           $ 1.16                  
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)       $ 1.16                      
Debt Instrument, Periodic Payment, Principal       $ 201,250                      
Placement Fee, Percent of Aggregate Gross Proceeds       7.00%                      
June 2020 Note [Member] | Secured Redeemable Convertible Note [Member] | Subsequent Event [Member]                              
Amortization of Debt Issuance Costs and Discounts, Total                     $ 957,919