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Debt Securities (Tables) | 6 Months Ended
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Jan. 31, 2025
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) |
January 31, 2025: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 18,615 |  |  | $ | 13 |  |  | $ | (42 | ) |  | $ | 18,586 |
Government sponsored enterprise notes |  |  | 1,867 |  |  |  | — |  |  |  | (1 | ) |  |  | 1,866 |
Corporate bonds |  |  | 3,678 |  |  |  | — |  |  |  | (278 | ) |  |  | 3,400 |
Total |  | $ | 24,160 |  |  | $ | 13 |  |  | $ | (321 | ) |  | $ | 23,852 |
July 31, 2024: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 16,641 |  |  | $ | 10 |  |  | $ | (66 | ) |  | $ | 16,585 |
Government sponsored enterprise notes |  |  | 3,356 |  |  |  | — |  |  |  | (3 | ) |  |  | 3,353 |
Corporate bonds |  |  | 3,821 |  |  |  | 1 |  |  |  | (322 | ) |  |  | 3,500 |
Total |  | $ | 23,818 |  |  | $ | 11 |  |  | $ | (391 | ) |  | $ | 23,438 |
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, 2025 were as follows: Schedule of Contractual Maturities of Available-for-sale Debt Securities
|  | Fair Value |
|  | (in thousands) |
Within one year |  | $ | 17,357 |
After one year through five years |  |  | 5,654 |
After five years through ten years |  |  | 813 |
After ten years |  |  | 28 |
Total |  | $ | 23,852 |
Schedule of Available-for-sale Securities, Unrealized Loss Position | The following table includes the fair value of the Company’s available-for-sale debt securities that were in an unrealized loss position: Schedule of Available-for-sale Securities, Unrealized Loss Position
|  | Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
January 31, 2025: |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 42 |  |  | $ | 5,309 |
Government sponsored enterprise notes |  |  | 1 |  |  |  | 1,567 |
Corporate bonds |  |  | 278 |  |  |  | 3,295 |
Total |  | $ | 321 |  |  | $ | 10,171 |
July 31, 2024: |  |  |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 66 |  |  | $ | 12,936 |
Government sponsored enterprise notes |  |  | 3 |  |  |  | 2,634 |
Corporate bonds |  |  | 322 |  |  |  | 3,310 |
Total |  | $ | 391 |  |  | $ | 18,880 |
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) |
January 31, 2025: |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 28 |  |  | $ | 2,844 |
Corporate bonds |  |  | 261 |  |  |  | 3,042 |
Total |  | $ | 289 |  |  | $ | 5,886 |
July 31, 2024: |  |  |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 60 |  |  | $ | 4,827 |
Corporate bonds |  |  | 307 |  |  |  | 3,209 |
Total |  | $ | 367 |  |  | $ | 8,036 |

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