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Note 4 - Fair Value Measurement and Fair Value of Financial Instruments (Tables)
3 Months Ended
Dec. 31, 2022
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

As of December 31, 2022

  

As of September 30, 2022

 
  

Montage
Capital

  

Series C

Preferred

  

Series D

Preferred

  

Montage

Capital

  

Series C

Preferred

  

Series D

Preferred

 

Volatility

  81.4

%

  83.4

%

  80.8

%

  82.0

%

  83.9

%

  84.7

%

Risk-free rate

  4.30

%

  4.50

%

  4.12

%

  4.20

%

  4.20

%

  4.10

%

Stock price

 $1.05  $1.05  $1.05  $1.31  $1.31  $1.31 
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

As of December 31, 2022

     
  

Level 1

  

Level 2

  

Level 3

  

Total

 
                 

Liabilities:

                

Warrant liabilities:

                

Montage

 $-  $-  $12  $12 

Series A and C

  -   -   113   113 

Series D

  -   -   327   327 

Total warrant liabilities

       $452  $452 
  

As of September 30, 2022

     
  

Level 1

  

Level 2

  

Level 3

  

Total

 
                 

Liabilities:

                

Warrant liabilities:

                

Montage

 $-  $-  $12  $12 

Series A and C

  -   -   234   234 

Series D

  -   -   503   503 

Total warrant liabilities

        749   749 

Contingent consideration obligations

  -   -   250   250 

Total Liabilities

 $-  $-  $999  $999 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

Contingent

Consideration

Obligations

  

Warrant

Liabilities

 

Balance at beginning of period, October 1, 2022

 $250  $749 

Additions

  -   - 

Payments or exercises

  (250

)

  - 

Adjustment to fair value

  -   (297

)

Balance at end of period, December 31, 2022

 $-  $452