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Note 8 - Stockholders' Equity (Tables)
3 Months Ended
Dec. 31, 2023
Notes Tables  
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]
  

Three Months Ended December 31,

 
  

2023

  

2022

 

Cost of revenue

 $-  $5 

Operating expenses

  112   88 
  $112  $93 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Type

 

Issue Date

 

Shares

  

Price

 

Expiration

Financing (Montage)

 

10/10/2017

  1,327  $132.50 

10/10/2025

Investors

 

3/12/2019

  872,625  $4.00 

9/12/2024

Investors

 

3/12/2019

  13,738  $0.05 

9/12/2024

Placement Agent

 

3/12/2019

  11,992  $4.00 

9/12/2024

Placement Agent

 

2/4/2021

  31,564  $3.88 

2/4/2026

Investors

 

5/14/2021

  592,106  $2.51 

11/16/2026

Placement Agent

 

5/14/2021

  179,536  $2.85 

5/12/2026

     1,702,888      
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Non-Board

 

Weighted-average fair value per share option

 $1.12 

Expected life (in years)

  6.0 

Volatility

  108.5%

Risk-free interest rate

  3.8%

Dividend yield

  0.0%
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
  

Restricted Stock

  

Stock Options

  

Stock Warrants

 
  

Awards

  

Awards

  Weighted Average Exercise Price  

Warrants

  Weighted Average Exercise Price 

Outstanding, October 1, 2023

  200,000   1,831,515  $2.56   1,757,629  $3.64 

Granted

  -   -   -   -   - 

Exercised

  -   -   -   -   - 

Forfeited

  -   (29,018)  1.58   -   - 

Expired

  -   (18)  1,362.50   (54,741)  10.17 

Outstanding, December 31, 2023

  200,000   1,802,479  $2.56   1,702,888  $3.43 

Options vested and exercisable, December 31, 2023

      1,192,642  $3.14