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Note 8 - Stockholders' Equity (Tables)
9 Months Ended
Jun. 30, 2022
Notes Tables  
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]
  

Three Months Ended
June 30,

  

Nine Months Ended
June 30,

 
  

2022

  

2021

  

2022

  

2021

 

Cost of revenue

 $6  $6  $19  $18 

Operating expenses

  86   37   188   115 

Interest expense and other, net

  157   -   157   - 
  $249  $43  $364  $133 
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]
  

Board

  

Non-Board

 

Weighted-average fair value per share option

 $1.30  $1.40 

Expected life (in years)

  5.0   6.0 

Volatility

  89.2

%

  95.0

%

Risk-free interest rate

  2.80

%

  2.80

%

Dividend yield

  0.0

%

  0.0

%

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

Stock Options

  

Stock Warrants

 
      

Weighted -

      

Weighted -

 
      

Average

      

Average

 
      

Exercise

      

Exercise

 
  

Options

  

Price

  

Warrants

  

Price

 
                 

Outstanding, October 1, 2021

  765,232  $4.66   1,788,745  $4.18 

Granted

  535,000   1.82   -   - 

Exercised

  (13,333

)

  1.40   (26,605)  3.88 

Forfeited

  (108,700

)

  2.38   -   - 

Expired

  (134

)

  937.88   (4,511)  218.89 

Outstanding, June 30, 2022

  1,178,065   3.60   1,757,629   3.64 

Options vested and exercisable, June 30, 2022

  586,765   5.33