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Debt Securities (Tables)
 6 Months Ended
Jan. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities

The following is a summary of available-for-sale debt securities:

 

   Amortized Cost   Gross Unrealized Gains   Gross Unrealized Losses   Fair Value 
   (in thousands) 
January 31, 2024:                    
Certificates of deposit*  $960   $—   $—  $960 
U.S. Treasury bills and notes   23,738    12    (76)   23,674 
Government sponsored enterprise notes   3,261    1    (3)   3,259 
Corporate bonds   3,901    1    (376)   3,526 
                     
Total  $31,860   $14   $(455)  $31,419 
                     
July 31, 2023:                    
Certificates of deposit*  $4,080   $—   $(4)  $4,076 
U.S. Treasury bills and notes   31,186    —    (148)   31,038 
Government sponsored enterprise notes   3,881    —    (8)   3,873 
Corporate bonds   3,912    —    (485)   3,427 
                     
Total  $43,059   $—   $(645)  $42,414 

 

* Each of the Company’s certificates of deposit has a CUSIP, was purchased in the secondary market through a broker and may be sold in the secondary market.
Schedule of Contractual Maturities of Available-for-sale Debt Securities

The contractual maturities of the Company’s available-for-sale debt securities at January 31, 2024 were as follows:

 

   Fair Value 
   (in thousands) 
Within one year  $23,087 
After one year through five years   7,496 
After five years through ten years   808 
After ten years   28 
      
Total  $31,419 
Schedule of Available-for-sale Securities, Unrealized Loss Position

The following available-for-sale debt securities were in an unrealized loss position for which other-than-temporary impairments were not recognized:

 

   Unrealized Losses   Fair Value 
   (in thousands) 
January 31, 2024:          
Certificates of deposit  $—   $— 
U.S. Treasury bills and notes   76    21,754 
Government sponsored enterprise notes   3    2,910 
Corporate bonds   376    3,384 
           
Total  $455   $28,048 
           
July 31, 2023:          
Certificates of deposit  $4   $3,356 
U.S. Treasury bills and notes   148    31,038 
Government sponsored enterprise notes   8    3,873 
Corporate bonds   485    3,368 
           
Total  $645   $41,635 
Schedule of Continuous Unrealized Loss Position for 12 Months or Longer

The following available-for-sale debt securities included in the table above were in a continuous unrealized loss position for 12 months or longer:

 

   Unrealized Losses   Fair Value 
   (in thousands) 
January 31, 2024:          
U.S. Treasury bills and notes  $63   $2,837 
Corporate bonds   376    3,384 
           
Total  $439   $6,221 
           
July 31, 2023:          
U.S. Treasury bills and notes  $86   $816 
Corporate bonds   484    3,299 
           
Total  $570   $4,115