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Note 5 - Fair Value Measurements (Tables)
6 Months Ended
Mar. 31, 2022
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

March 31, 2022

 
  

Cost Basis

  

Unrealized
Gain (Loss)

  

Fair Value

  

Cash
Equivalents

  

Short-term
Securities

  

Long-term
Securities

 

Level 1:

                        

Money market funds

 $988  $-  $988  $988  $-  $- 
                         

Level 2:

                        

Certificates of deposit

  1,244   -   1,244   -   942   302 

Municipal securities

  5,370   (48)  5,322   -   4,126   1,196 

Corporate bonds

  923   (21)  902   -   136   766 

Subtotal

  7,537   (69)  7,468   -   5,204   2,264 
                         

Total

 $8,525  $(69) $8,456  $988  $5,204  $2,264 
  

September 30, 2021

 
  

Cost Basis

  

Unrealized
Gain (Loss)

  

Fair Value

  

Cash
Equivalents

  

Short-term
Securities

  

Long-term
Securities

 

Level 1:

                        

Money market funds

 $932  $-  $932  $932  $-  $- 
                         

Level 2:

                        

Certificates of deposit

  1,494   -   1,494   -   694   800 

Municipal securities

  5,139   (1)  5,138   -   4,205   933 

Corporate bonds

  928   1   929   -   787   142 

Subtotal

  7,561   -   7,561   -   5,686   1,875 
                         

Total

 $8,493  $-  $8,493  $932  $5,686  $1,875 
Fair Value Measurements, Nonrecurring [Table Text Block]
  

Carrying

Value

  

Level 1

  

Level 2

  

Level 3

  

Gain/ (Loss)

 

Operating lease ROU asset

 $7  $-  $-   7  $- 
Holdback Liability [Member]  
Notes Tables  
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]

Balance as of September 30, 2021

 $687 

Accretion

  24 

Currency translation

  12 

Balance as of March 31, 2022

 $723