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Schedule of Continuous Unrealized Loss Position for 12 Months or Longer (Details) - USD ($) $ in Thousands | Jul. 31, 2023 | Jul. 31, 2022
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Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 570 | $ 306
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,115 | 2,623
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 86 | 72
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 816 | 892
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 484 | 234
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 3,299 | $ 1,731

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