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Note 1 - Basis of Presentation and Significant Accounting Policies (Tables)
12 Months Ended
Sep. 30, 2022
Notes Tables  
Investment in Sales-type Leases [Table Text Block]

Investment in sales-type lease, gross:

    

2023

 $281 

2024

  157 

2025

  64 

Gross investment in sales-type lease

  502 

Less: Unearned income

   

Total investment in sales-type lease

 $502 
     

Current portion of total investment in sales-type lease

 $281 

Long-term portion of total investment in sales-type lease

  221 
  $502 
Schedule of Inventory, Current [Table Text Block]
  

September 30,

 
  

2022

  

2021

 

Raw materials and supplies

 $507  $301 

Finished goods

  1,062   247 

Less: Obsolescence reserve

  (107)  (106)

Inventories

 $1,462  $442 
Property, Plant and Equipment [Table Text Block]
  

Years

 
  

(In Years)

 

Leasehold improvements

  5 to 15 

Computer equipment

  1.5 to 5 

Furniture and fixtures

  3 to 15 
Schedule of Asset Retirement Obligations [Table Text Block]

Asset retirement obligation at September 30, 2020

 $134 

Accretion expense

  2 

Foreign currency changes

  (7)

Asset retirement obligation at September 30, 2021

  129 

Settlement of ARO

  (129)

Additional ARO for new office lease

  95 

Accretion expense

  1 

Foreign currency changes

  (19)

Asset retirement obligation at September 30, 2022

 $77 
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

September 30, 2022

 

Level 1

  

Level 2

  

Level 3

  

Fair Value

 

Derivative liability

 $  $  $  $ 
              

Total

 

September 30, 2021

 

Level 1

  

Level 2

  

Level 3

  

Fair Value

 

Derivative liability

 $  $53  $  $53 
Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
  

Years Ending September 30,

 
  

2022

  

2021

 

Expected life (years)

 

4.9 - 5.3

  

4.3-5.3

 

Risk-free interest rate

 1.07% - 3.03%  0.33% - 0.59% 

Expected volatility

 64.83% - 67.21%  65.00% - 83.29% 

Expected forfeiture rate

 14.65% - 20.00%  14.18%-16.41% 

Expected exercise factor

 2.02 - 2.03  1.2 - 1.87 

Expected dividend yield

 

0%

  

0%

 
Schedule of Weighted Average Number of Shares [Table Text Block]
  

Years Ending

 
  

September 30,

 
  

2022

  

2021

 

Denominator for basic earnings (loss) per share

        

-weighted average common shares

  9,899,724   8,230,100 

Effect of dilutive options and warrants (treasury method)

     420,284 

Denominator for diluted earnings (loss) per share

        

-adjusted weighted average common shares

  9,899,724   8,650,384 

Options and warrants outstanding during each year, but not included in the computation of diluted earnings (loss) per share because they are antidilutive