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Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jan. 31, 2024 | Jul. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale, Amortized Cost |  | $ 31,860 | $ 43,059
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 14 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (455) | (645)
Debt Securities, Available-for-Sale |  | 31,419 | 42,414
Certificates of Deposit [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | [1] | 960 | 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] | 960 | 4,076
US Treasury Bill Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 23,738 | 31,186
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 12 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (76) | (148)
Debt Securities, Available-for-Sale |  | 23,674 | 31,038
US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 3,261 | 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 |  | (3) | (8)
Debt Securities, Available-for-Sale |  | 3,259 | 3,873
Corporate Bond Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 3,901 | 3,912
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  | 1 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (376) | (485)
Debt Securities, Available-for-Sale |  | $ 3,526 | $ 3,427
[1] | 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.

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