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Note 4 - Fair Value Measurement and Fair Value of Financial Instruments (Tables)
9 Months Ended
Jun. 30, 2022
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

As of June 30, 2022

  

As of September 30, 2021

 
  

Montage
Capital

  

Series C

Preferred

  

Series D

Preferred

  

Montage

Capital

  

Series C

Preferred

  

Series D Preferred

 

Volatility

  82.7

%

  84.3

%

  88.9

%

  88.7

%

  83.9

%

  85.7

%

Risk-free rate

  3.00

%

  2.90

%

  3.00

%

  0.80

%

  0.50

%

  1.00

%

Stock price

 $1.20  $1.20  $1.20  $4.11  $4.11  $4.11 
Fair Value, Contingent Consideration Measured on Recurring Basis, Valuation Technique [Table Text Block]

Revenue discount rate

  3.5

%

Revenue volatility

  11.0

%

Discount rate

  10.5

%

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

As of June 30, 2022

     
  

Level 1

  

Level 2

  

Level 3

  

Total

 
                 

Liabilities:

                

Warrant liabilities:

                

Montage

 $-  $-  $12  $12 

Series A and C

  -   -   223   223 

Series D

  -   -   476   476 

Total warrant liabilities

        711   711 

Contingent consideration obligations

  -   -   2,029   2,029 

Total Liabilities

 $-  $-  $2,740  $2,740 
  

As of September 30, 2021

     
  

Level 1

  

Level 2

  

Level 3

  

Total

 
                 

Liabilities:

                

Warrant liabilities:

                

Montage

 $-  $-  $13  $13 

Series A and C

  -   -   2,026   2,026 

Series D

  -   -   2,365   2,365 

Total warrant liabilities

        4,404   4,404 

Contingent consideration obligations

  -   -   3,649   3,649 

Total Liabilities

 $-  $-  $8,053  $8,053 
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, 2021

 $3,649  $4,404 

Additions

  -   - 

Payments or exercises

  (509

)

  - 

Adjustment to fair value

  70   (2,441

)

Balance at end of period, December 31, 2021

 $3,210  $1,963 

Additions

  -   - 

Payments or exercises

  -   - 

Adjustment to fair value

  (543)  (434

)

Balance at end of period, March 31, 2022

 $2,667  $1,529 

Additions

  -   - 

Exercises or payments

  (480

)

  - 

Adjustment to fair value

  (158

)

  (818)

Balance at end of period, June 30, 2022

 $2,029  $711