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Debt Securities (Tables) | 9 Months Ended
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Apr. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities | The following is a summary of available-for-sale debt securities: Schedule of Available-for-sale Securities
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
April 30, 2024: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 23,710 |  |  | $ | — |  |  | $ | (131 | ) |  | $ | 23,579 |
Government sponsored enterprise notes |  |  | 2,378 |  |  |  | — |  |  |  | (6 | ) |  |  | 2,372 |
Corporate bonds |  |  | 3,864 |  |  |  | — |  |  |  | (431 | ) |  |  | 3,433 |
Total |  | $ | 29,952 |  |  | $ | — |  |  | $ | (568 | ) |  | $ | 29,384 |
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 April 30, 2024 were as follows: Schedule of Contractual Maturities of Available-for-sale Debt Securities
|  | Fair Value |
|  |  | (in thousands) |
Within one year |  | $ | 21,816 |
After one year through five years |  |  | 6,441 |
After five years through ten years |  |  | 1,078 |
After ten years |  |  | 49 |
Total |  | $ | 29,384 |
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: Schedule of Available-for-sale Securities, Unrealized Loss Position
|  | Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
April 30, 2024: |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 131 |  |  | $ | 23,579 |
Government sponsored enterprise notes |  |  | 6 |  |  |  | 2,372 |
Corporate bonds |  |  | 431 |  |  |  | 3,433 |
Total |  | $ | 568 |  |  | $ | 29,384 |
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: Schedule of Continuous Unrealized Loss Position for 12 Months or Longer
|  | Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
April 30, 2024: |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 72 |  |  | $ | 2,950 |
Corporate bonds |  |  | 411 |  |  |  | 3,218 |
Total |  | $ | 483 |  |  | $ | 6,168 |
July 31, 2023: |  |  |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 86 |  |  | $ | 816 |
Corporate bonds |  |  | 484 |  |  |  | 3,299 |
Total |  | $ | 570 |  |  | $ | 4,115 |

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