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Schedule of Available-for-sale Securities, Unrealized Loss Position (Details) - USD ($) $ in Thousands | Oct. 31, 2023 | Jul. 31, 2023
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Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ 711 | $ 645
Debt Securities, Available-for-Sale, Unrealized Loss Position | 33,242 | 41,635
Certificates of Deposit [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 3 | 4
Debt Securities, Available-for-Sale, Unrealized Loss Position | 1,917 | 3,356
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 141 | 148
Debt Securities, Available-for-Sale, Unrealized Loss Position | 24,944 | 31,038
US Government-sponsored Enterprises Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 3 | 8
Debt Securities, Available-for-Sale, Unrealized Loss Position | 3,044 | 3,873
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 564 | 485
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 3,337 | $ 3,368

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