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Schedule of Available-for-sale Securities, Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jul. 31, 2022 | Jul. 31, 2021
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Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 547 | $ 50
Debt Securities, Available-for-sale, Unrealized Loss Position | 21,646 | 4,945
Certificates of Deposit [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 14 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,986 |
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 114 | 17
Debt Securities, Available-for-sale, Unrealized Loss Position | 13,734 | 1,652
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 416 | 33
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,514 | $ 3,293
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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