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

Three Months Ended
March 31,

  

Six Months Ended
March 31,

 
  

2023

  

2022

  

2023

  

2022

 

Cost of revenue

 $1  $5  $6  $13 

Operating expenses

  83   47   171   102 
  $84  $52  $177  $115 
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

 

10/19/2018

  3,120  $25.00 

10/19/2023

Placement Agent

 

10/16/2018

  10,000  $31.25 

10/16/2023

Investors

 

3/12/2019

  41,621  $4.00 

10/19/2023

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

Total

  1,757,629      
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Six months ended March 31,

 
  

2023

  

2022

 

Weighted-average fair value per share option

 $1.12  $2.96 

Expected life (in years)

  6.0   6.0 

Volatility

  108.5

%

  90.8

%

Risk-free interest rate

  3.8

%

  1.1

%

Dividend yield

  0.0

%

  0.0

%

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

Restricted Stock

  

Stock Options

  

Stock Warrants

 
          

Weighted
Average

      

Weighted
Average

 
  

Awards

  

Awards

  

Exercise
Price

  

Warrants

  

Exercise
Price

 

Outstanding, October 1, 2022

  200,000   1,157,927  $3.49   1,757,629  $3.64 

Granted

  -   50,000   1.34   -   - 

Exercised

  -   -   -   -   - 

Forfeited

  -   (23,333

)

  2.51   -   - 

Expired

  -   (56

)

  1,946.43   -   - 

Outstanding, March 31, 2023

  200,000   1,184,538  $3.33   1,757,629  $3.64 

Options vested and exercisable, March 31, 2023

      807,035  $4.00