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Schedule of Available-for-sale Securities, Unrealized Loss Position (Details) - USD ($) $ in Thousands | Oct. 31, 2022 | Jul. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 768 | $ 547
Debt Securities, Available-for-sale, Unrealized Loss Position | 19,331 | 21,646
Certificates of Deposit [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3 | 14
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,997 | 1,986
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 114 | 114
Debt Securities, Available-for-sale, Unrealized Loss Position | 13,780 | 13,734
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 650 | 416
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,304 | 3,514
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1 | 3
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 250 | $ 2,412

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