v3.22.2.2
Note 7 - Convertible Promissory Notes (Details Textual) - USD ($)
3 Months Ended
Dec. 14, 2020
Dec. 10, 2020
Jan. 02, 2020
Nov. 01, 2018
Jun. 01, 2016
Oct. 31, 2020
Dec. 31, 2020
Dec. 15, 2020
Aug. 01, 2020
Mar. 01, 2020
Dec. 31, 2019
The 2018 Contingent Warrants [Member]                      
Warrants and Rights Outstanding, Term (Year)       5 years              
Warrants and Rights Outstanding                     $ 0
The 2020 Contingent Warrants [Member]                      
Warrants and Rights Outstanding, Term (Year)                   5 years  
Warrants and Rights Outstanding             $ 0        
Conversion of 2016 Notes into Common Stock [Member] | Closing [Member]                      
Conversion of Stock, Shares Issued (in shares) 576,836                    
Conversion of 2018 Notes into Common Stock [Member] | Closing [Member]                      
Conversion of Stock, Shares Issued (in shares) 56,461                    
Conversion of 2020 Notes into Common Stock [Member] | Closing [Member]                      
Conversion of Stock, Shares Issued (in shares) 113,422                    
Conversion of Reviva Contingent Interim Period Note into Common Stock [Member] | Closing [Member]                      
Conversion of Stock, Shares Issued (in shares)   261,626                  
Conversion of 2016 Notes into Common Stock [Member]                      
Debt Conversion, Converted Instrument, Shares Issued (in shares)   3,788,461                  
Debt Instrument, Convertible, Conversion Price (in dollars per share)   $ 1.329698                  
Conversion of 2018 Notes into Common Stock [Member]                      
Debt Conversion, Converted Instrument, Shares Issued (in shares)   370,811                  
Conversion of 2018 Notes into Common Stock with Aggregate Principal Amount of at Least $50,000 [Member]                      
Debt Instrument, Convertible, Conversion Price (in dollars per share)   $ 0.831018                  
Conversion of 2018 Notes into Common Stock with Aggregate Principal Amount Less Than $50,000 [Member]                      
Debt Instrument, Convertible, Conversion Price (in dollars per share)   $ 1.330045                  
Conversion of 2020 Notes into Common Stock [Member]                      
Debt Conversion, Converted Instrument, Shares Issued (in shares)   744,916                  
Conversion of 2020 Notes into Common Stock with Aggregate Principal Amount of at Least $50,000 [Member]                      
Debt Instrument, Convertible, Conversion Price (in dollars per share)           $ 0.831009          
Conversion of 2020 Notes into Common Stock with Aggregate Principal Amount Less Than $50,000 [Member]                      
Debt Instrument, Convertible, Conversion Price (in dollars per share)   $ 1.329770                  
Conversion of August 2020 to October 2020 Notes into Common Stock [Member]                      
Debt Conversion, Converted Instrument, Shares Issued (in shares)           601,632          
Debt Instrument, Convertible, Conversion Price (in dollars per share)           $ 0.831063          
Conversion of Reviva Contingent Interim Period Note into Common Stock [Member]                      
Debt Conversion, Converted Instrument, Shares Issued (in shares)           1,718,280          
Debt Instrument, Convertible, Conversion Price (in dollars per share)           $ 1.163953          
The 2016 Notes [Member]                      
Debt Instrument, Face Amount         $ 4,795,088            
Qualified Financing, Minimum Threshold         $ 5,000,000            
Qualified Financing, Discount Rate to Price Paid by Investors         20.00%            
Pre-offering Valuation Prior to Qualified Financing Event         $ 85,000,000            
Debt Instrument, Interest Rate, Stated Percentage         8.00%            
Debt Instrument, Term (Month)         12 months            
Debt Instrument, Debt Default, Interest Rate             12.00%        
Convertible Notes Payable, Total   $ 1,200,000 $ 1,200,000               3,490,087
Interest Payable                     $ 1,192,496
Debt Instrument, Convertible, Beneficial Conversion Feature   0                  
Warrants and Rights Outstanding $ 7,395                    
The 2016 Notes [Member] | One Investor [Member]                      
Debt Instrument, Interest Rate, Stated Percentage     5.50%                
Interest Payable, Current     $ 242,236         $ 79,840      
Debt Instrument, Fee Amount     5,000                
Repayments of Convertible Debt     $ 1,447,236                
The 2018 Notes [Member]                      
Debt Instrument, Face Amount       $ 275,000              
Qualified Financing, Discount Rate to Price Paid by Investors       20.00%              
Debt Instrument, Interest Rate, Stated Percentage       8.00%              
Debt Instrument, Term (Month)       6 months              
Debt Instrument, Debt Default, Interest Rate             8.00%        
Debt Instrument, Convertible, Beneficial Conversion Feature   159,025                  
Debt Instrument, Renewal Term (Month)       6 months              
The 2020 Notes [Member]                      
Debt Instrument, Face Amount                   $ 610,000  
Qualified Financing, Discount Rate to Price Paid by Investors                   20.00%  
Debt Instrument, Convertible, Beneficial Conversion Feature   $ 317,730                  
August 2020 to October 2020 Notes [Member]                      
Debt Instrument, Face Amount                 $ 500,000    
Debt Instrument, Convertible, Beneficial Conversion Feature           $ 274,083          
Reviva Contingent Interim Period Note [Member]                      
Debt Instrument, Face Amount                 $ 2,000,000    
Debt Instrument, Convertible, Beneficial Conversion Feature           $ 210,842