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Note 3 - Short-term Investments
 6 Months Ended
Mar. 31, 2025
Notes to Financial Statements  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

3. Short-term Investments

 

The Company classifies its short-term investments as available-for-sale securities. Available-for-sale securities are carried at fair market value with net unrealized gains and losses reported as a component of accumulated other comprehensive income (loss) in stockholders’ equity. 

 

The Company’s short-term investments were composed of the following (in thousands):

 

  

As of March 31, 2025

 
  

Amortized Cost

  

Unrealized Gains

  

Unrealized Losses

  

Estimated Fair Value

 

Short-term investments:

                

Corporate bonds

 $9,281  $—  $(2) $9,279 

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

  2,250   2   —   2,252 

Total

 $11,531  $2  $(2) $11,531 

  

  

As of September 30, 2024

 
  

Amortized Cost

  

Unrealized Gains

  

Unrealized Losses

  

Estimated Fair Value

 

Short-term investments:

                

Corporate bonds

 $21,814  $35  $—  $21,849 

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

  8,356   22   —   8,378 

Total

 $30,170  $57  $—  $30,227 

 

The Company had no securities in a material unrealized loss position at  March 31, 2025 and  September 30, 2024 and does not believe the unrealized losses associated with these securities represent credit losses based on the evaluation of evidence, which includes an assessment of whether it is more likely than not it will be required to sell or intend to sell the investment before recovery of the investments amortized cost basis. During each of the three and six months ended March 31, 2025, a gain of $9,000 and $10,000, respectively, was realized from the sale of short-term investments. No gains or losses were recognized during the three and six months ended March 31, 2024 from the sale of short-term investments.