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Schedule of Continuous Unrealized Loss Position for 12 Months or Longer (Details) - USD ($) $ in Thousands | Apr. 30, 2024 | Jul. 31, 2023
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Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 483 | $ 570
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 6,168 | 4,115
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 72 | 86
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,950 | 816
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 411 | 484
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 3,218 | $ 3,299

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