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Schedule of Available-for-sale Securities, Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jul. 31, 2024 | Jul. 31, 2023
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Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ 391 | $ 645
Debt Securities, Available-for-Sale, Unrealized Loss Position | 18,880 | 41,635
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 66 | 148
Debt Securities, Available-for-Sale, Unrealized Loss Position | 12,936 | 31,038
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 |
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 322 | 8
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 3,310 | 3,873
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
Municipal Bonds [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss |  | 485
Debt Securities, Available-for-Sale, Unrealized Loss Position |  | $ 3,368

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