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Schedule of Available-for-sale Securities, Unrealized Loss Position (Details) - USD ($) $ in Thousands | Apr. 30, 2025 | Jul. 31, 2024
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Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ 251 | $ 391
Debt Securities, Available-for-Sale, Unrealized Loss Position | 15,517 | 18,880
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 31 | 66
Debt Securities, Available-for-Sale, Unrealized Loss Position | 12,455 | 12,936
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 220 | 322
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 3,062 | 3,310
Government Sponsored Enterprise Notes [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss |  | 3
Debt Securities, Available-for-Sale, Unrealized Loss Position |  | $ 2,634

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