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Debt Securities (Tables)
 6 Months Ended
Jan. 31, 2023
Debt Securities, Trading and Available-for-Sale [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, 2023:                    
U.S. Treasury bills and notes  $23,854   $4   $(94)  $23,764 
Government sponsored enterprises notes   2,512    —    (4)   2,508 
Corporate bonds   3,991    1    (487)   3,505 
Total  $30,357   $5   $(585)  $29,777 
                     
July 31, 2022:                    
Certificates of deposit*  $2,000   $—   $(14)  $1,986 
U.S. Treasury bills and notes   13,848    —    (114)   13,734 
Corporate bonds   3,966    1    (416)   3,551 
Municipal bonds   3,035    —    (3)   3,032 
Total  $22,849   $1   $(547)  $22,303 

 

*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, 2023 were as follows:

   

      
   Fair Value 
   (in thousands) 
Within one year  $22,521 
After one year through five years   5,973 
After five years through ten years   1,236 
After ten years   

47

 
Total  $

29,777

 
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, 2023:          
U.S. Treasury bills and notes  $94   $11,315 
Government sponsored enterprises notes   4    2,508 
Corporate bonds   487    3,450 
Total  $585   $17,273 
           
July 31, 2022:          
Certificates of deposit  $14   $1,986 
U.S. Treasury bills and notes   114    13,734 
Corporate bonds   416    3,514 
Municipal bonds   3    2,412 
Total  $547   $21,646 
Schedule of Continuous Unrealized Loss Position for 12 Months or Longer

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

  

   Unrealized Losses   Fair Value 
   (in thousands) 
January 31, 2023:          
U.S. Treasury bills and notes  $87   $874 
Corporate bonds   475    3,286 
Total  $562   $4,160 
           
July 31, 2022:          
U.S. Treasury bills and notes  $72   $892 
Corporate bonds   234    1,731 
Total  $306   $2,623