Annual report pursuant to Section 13 and 15(d)

Note 14 - Stock-based Compensation (Details Textual)

v3.22.4
Note 14 - Stock-based Compensation (Details Textual) - USD ($)
12 Months Ended
Sep. 27, 2021
Jul. 30, 2021
Jan. 27, 2021
Oct. 14, 2020
Jun. 18, 2013
Sep. 30, 2022
Sep. 30, 2021
Oct. 01, 2021
Common Stock, Shares Authorized           800,000,000 800,000,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum           79.44%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum           119.44%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum           0.13%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum           2.85%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate           0.00%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term           5 years 7 months 6 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares           16,504,312    
Research and Development Expense [Member]                
Share-Based Payment Arrangement, Expense           $ 148,000 $ 124,000  
General and Administrative Expense [Member]                
Share-Based Payment Arrangement, Expense           311,000 267,000  
Employees Directors And Consultants [Member]                
Share-Based Payment Arrangement, Expense           459,000 391,000  
Non Employee Restricted Shares [Member]                
Share-Based Payment Arrangement, Expense           $ 40,000 $ 105,000  
The 2013 Plan [Member]                
Common Stock, Shares Authorized             31,114,256 34,114,256
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized         3,000,000      
Increase In Aggregate Number Of Shares               3,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant           8,273,158    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total           $ 181,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition           2 years 5 months 19 days    
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount           $ 3,000    
The 2013 Plan [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Tranche One [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares   50,000            
The 2013 Plan [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Employee [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares)   150,000            
The 2013 Plan [Member] | Restricted Stock [Member] | Board Of Directors And Management [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares)           475,000    
The 2013 Plan [Member] | Restricted Stock [Member] | Consultants [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares) 300,000   500,000 50,000        
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Other (in shares)           850,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period       90 days        
The 2013 Plan [Member] | Restricted Stock [Member] | Consultants [Member] | Share-Based Payment Arrangement, Tranche One [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage           8.33%