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Schedule of Available-for-sale Securities, Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jan. 31, 2023 | Jul. 31, 2022
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Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $ 585 | $ 547
Debt Securities, Available-for-Sale, Unrealized Loss Position | 17,273 | 21,646
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 94 | 114
Debt Securities, Available-for-Sale, Unrealized Loss Position | 11,315 | 13,734
US Government-sponsored Enterprises Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 4 |
Debt Securities, Available-for-Sale, Unrealized Loss Position | 2,508 |
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 487 | 416
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 3,450 | 3,514
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
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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