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Schedule of Available-for-sale Securities, Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jul. 31, 2023 | Jul. 31, 2022
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Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 645 | $ 547
Debt Securities, Available-for-sale, Unrealized Loss Position | 41,635 | 21,646
Certificates of Deposit [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4 | 14
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,356 | 1,986
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 148 | 114
Debt Securities, Available-for-sale, Unrealized Loss Position | 31,038 | 13,734
Government Sponsored Enterprise Notes [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 8 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,873 |
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 485 | 416
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 3,368 | 3,514
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | 3
Debt Securities, Available-for-sale, Unrealized Loss Position |  | $ 2,412

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