General form of registration statement for all companies including face-amount certificate companies

Note 14 - Stock-based Compensation (Details Textual)

v3.23.3
Note 14 - Stock-based Compensation (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 27, 2021
Jul. 30, 2021
Jan. 27, 2021
Oct. 14, 2020
Jun. 18, 2013
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Oct. 01, 2022
Oct. 01, 2021
Common Stock, Shares Authorized           12,000,000   12,000,000   500,000 500,000    
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               9,927   10,316      
Research and Development Expense [Member]                          
Share-Based Payment Arrangement, Expense           $ 7,000 $ 29,000 $ 55,000 $ 123,000 $ 148,000 $ 124,000    
General and Administrative Expense [Member]                          
Share-Based Payment Arrangement, Expense           34,000 52,000 156,000 245,000 311,000 267,000    
Employees Directors And Consultants [Member]                          
Share-Based Payment Arrangement, Expense           41,000 81,000 211,000 367,000 459,000 391,000    
Non Employee Restricted Shares [Member]                          
Share-Based Payment Arrangement, Expense           $ 0 $ 10,000 $ 3,000 $ 30,000 $ 40,000 $ 105,000    
The 2013 Plan [Member]                          
Common Stock, Shares Authorized                   21,322 19,447 23,197 21,322
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized         1,875                
Increase In Aggregate Number Of Shares                       1,875 1,875
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant           0   0   5,171      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount           $ 200,000   $ 200,000   $ 181,000      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition               2 years 1 month 9 days   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   32                      
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)   94                      
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)               2,610   297      
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) 188   313 32                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Other (in shares)               454   532      
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%