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Debt Securities (Tables)
 3 Months Ended
Oct. 31, 2021
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) 
October 31, 2021:                
Certificates of deposit*  $-   $-   $—   $- 
U.S. Treasury bills and notes  $1,663   $—   $(36)  $1,627 
Corporate bonds   6,276    33    (116)   6,193 
Municipal bonds   5,814    —    (1)   5,813 
Total  $13,753   $33   $(153)  $13,633 
                     
July 31, 2021:                    
Certificates of deposit*  $1,200   $3   $—   $1,203 
U.S. Treasury bills and notes   1,669    —    (17)   1,652 
Corporate bonds   6,327    38    (33)   6,332 
Municipal bonds   4,825    —    —    4,825 
Total  $14,021   $41   $(50)  $14,012 

 

* 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 October 31, 2021 were as follows:

 

   Fair Value 
   (in thousands) 
Within one year  $1,258 
After one year through five years   6,326 
After five years through ten years   5,249 
After ten years   800 
Total  $13,633 
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)     
October 31, 2021:          
U.S. Treasury bills and notes  $36   $1,627 
Corporate bonds   116    5,572 
Municipal bonds   1    4,569 
Total  $153   $11,768 
           
July 31, 2021:          
U.S. Treasury bills and notes  $17   $1,652 
Corporate bonds   33    3,293 
Total  $50   $4,945 
Schedule of Continuous Unrealized Loss Position for 12 Months or Longer

At July 31, 2021, there were no securities in a continuous unrealized loss position for 12 months or longer. At October 31, 2021, 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) 
U.S. Treasury bills and notes  $36   $1,627 
Corporate bonds   44    1,219 
Total  $80   $2,846