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Schedule of Available-for-sale Securities, Unrealized Loss Position (Details) - USD ($) $ in Thousands | Apr. 30, 2024 | Jul. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ 568 | $ 645
Debt Securities, Available-for-Sale, Unrealized Loss Position | 29,384 | 41,635
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 131 | 148
Debt Securities, Available-for-Sale, Unrealized Loss Position | 23,579 | 31,038
US Government-sponsored Enterprises Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 6 | 8
Debt Securities, Available-for-Sale, Unrealized Loss Position | 2,372 | 3,873
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 431 | 485
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 3,433 | 3,368
Certificates of Deposit [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss |  | 4
Debt Securities, Available-for-Sale, Unrealized Loss Position |  | $ 3,356

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