XML 33 R17.htm IDEA: XBRL DOCUMENT v3.25.3
Note 5 - Marketable Securities
 12 Months Ended
Sep. 30, 2025
Notes to Financial Statements  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

5.    Marketable Securities

 

During fiscal years 2025 and 2024, the Company had sales and maturities of marketable securities of $389.5 million and $666.2 million, respectively. Realized gains on the sales of marketable securities were insignificant for the fiscal year ended  September 30, 2025 and 2024.

 

The following is a summary of the amortized cost and the fair value, including accrued interest receivable, as well as unrealized gains (losses) on the short-term and long-term marketable securities as of September 30, 2025 and 2024 (in thousands):

 

      

Gross

  

Gross

     
  

Amortized

  

Unrealized

  

Unrealized

     
  

Cost

  

Losses

  

Gains

  

Fair Value

 

September 30, 2025:

                

U.S. Treasury securities and obligations of U.S. government agencies

 $245,691  $(94) $168  $245,765 

Bank certificates of deposits

  1,640   —   1   1,641 

Corporate securities

  4,199   —   —   4,199 

Municipal securities

  11,048   —   69   11,117 
  $262,578  $(94) $238  $262,722 

September 30, 2024:

                

U.S. Treasury securities and obligations of U.S. government agencies

 $118,159  $(119) $51  $118,091 

Bank certificates of deposits

  5,212   (13)  1   5,200 

Corporate securities

  77,580   (255)  —   77,325 
  $200,951  $(387) $52  $200,616 

 

The fair values of the marketable securities by contractual maturities at September 30, 2025 are presented below (in thousands).

 

  

Amortized

     
  

Cost

  

Fair Value

 

Due in one year or less

 $61,116  $61,137 

Due after one year through five years

  197,511   197,634 

Due after five years through ten years

  —   — 

Due after ten years

  3,951   3,951 

Total marketable securities

 $262,578  $262,722 

 

Expected maturities could differ from contractual maturities because the security issuers may have the right to prepay obligations without prepayment penalties.

 

Unrealized losses from fixed-income securities are primarily attributable to changes in interest rates. The Company does not believe any unrealized losses represent impairments based on the evaluation of the available evidence.