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Schedule of Available-for-sale Securities, Unrealized Loss Position (Details) - USD ($) $ in Thousands | Apr. 30, 2022 | Jul. 31, 2021
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Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 557 | $ 50
Debt Securities, Available-for-sale, Unrealized Loss Position | 12,280 | 4,945
Certificates of Deposit [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 9 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,991 |
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 80 | 17
Debt Securities, Available-for-sale, Unrealized Loss Position | 887 | 1,652
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 452 | 33
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,495 | $ 3,293
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 16 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 5,907 |

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