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Schedule of Available-for-sale Securities, Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jan. 31, 2024 | Jul. 31, 2023
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Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ 455 | $ 645
Debt Securities, Available-for-Sale, Unrealized Loss Position | 28,048 | 41,635
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
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 76 | 148
Debt Securities, Available-for-Sale, Unrealized Loss Position | 21,754 | 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 | 2,910 | 3,873
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 376 | 485
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 3,384 | $ 3,368

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