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Note 4 - Fair Value of Financial Instruments (Tables)
12 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

AS OF SEPTEMBER 30, 2023

 
  Quoted Prices in Active Markets for Identical Assets (Level 1)  Significant Other Unobservable (Level 2)  Significant Unobservable (Level 3)  

Totals

 

Short-term investments:

      .         

Corporate bonds

 $  $11,295  $  $11,295 

U.S. treasury securities and securities of U.S. government-sponsored agency

      3,626       3,626 

Total assets

 $  $14,921  $  $14,921 
  

AS OF SEPTEMBER 30, 2022

 
  Quoted Prices in Active Markets for Identical Assets (Level 1)  Significant Other Unobservable (Level 2)  Significant Unobservable (Level 3)  

Totals

 

Short-term investments:

                

Corporate bonds

 $  $894  $  $894 

Total assets

 $  $894  $  $894 
                 

Contingent consideration liabilities:

                

Contingent consideration liabilities

        175   175 

Total liabilities

 $  $  $175  $175 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Contingent Consideration balance at October 1, 2021

 $6,017 

Fair value adjustments

  (5,035)

Payment of contingent consideration

  (807)

Balance at September 30, 2022

  175 

Fair value adjustments

   

Payment of contingent consideration

  (175)

Balance at September 30, 2023

 $