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Debt Securities (Tables) | 9 Months Ended
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Apr. 30, 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) |
April 30, 2025: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 13,833 |  |  | $ | — |  |  | $ | (31 | ) |  | $ | 13,802 |
Government sponsored enterprise notes |  |  | 1,617 |  |  |  | — |  |  |  | — |  |  |  | 1,617 |
Corporate bonds |  |  | 3,482 |  |  |  | 2 |  |  |  | (220 | ) |  |  | 3,264 |
Total |  | $ | 18,932 |  |  | $ | 2 |  |  | $ | (251 | ) |  | $ | 18,683 |
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 April 30, 2025 were as follows: Schedule of Contractual Maturities of Available-for-sale Debt Securities
|  | Fair Value |
|  | (in thousands) |
Within one year |  | $ | 15,585 |
After one year through five years |  |  | 2,592 |
After five years through ten years |  |  | 477 |
After ten years |  |  | 29 |
Total |  | $ | 18,683 |
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) |
April 30, 2025: |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 31 |  |  | $ | 12,455 |
Corporate bonds |  |  | 220 |  |  |  | 3,062 |
Total |  | $ | 251 |  |  | $ | 15,517 |
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) |
April 30, 2025: |  |  |  |  |  |
U.S. Treasury bills and notes |  | $ | 16 |  |  | $ | 271 |
Corporate bonds |  |  | 218 |  |  |  | 2,984 |
Total |  | $ | 234 |  |  | $ | 3,255 |
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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