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Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jul. 31, 2024 | Jul. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale, Amortized Cost |  | $ 23,818 | $ 43,059
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 11 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (391) | (645)
Debt Securities, Available-for-Sale |  | 23,438 | 42,414
US Treasury Bill Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 16,641 | 31,186
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 10 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (66) | (148)
Debt Securities, Available-for-Sale |  | 16,585 | 31,038
US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 3,356 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (3) |
Debt Securities, Available-for-Sale |  | 3,353 |
Corporate Bond Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 3,821 | 3,881
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 1 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (322) | (8)
Debt Securities, Available-for-Sale |  | $ 3,500 | 3,873
Certificates of Deposit [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | [1] |  | 4,080
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | [1] |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | [1] |  | (4)
Debt Securities, Available-for-Sale | [1] |  | 4,076
Municipal Bonds [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  |  | 3,912
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  |  | (485)
Debt Securities, Available-for-Sale |  |  | $ 3,427
[1] | Each of the certificates of deposit held by the Company has a CUSIP, was purchased in the secondary market through a broker and may be sold in the secondary market.

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