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Schedule of Continuous Unrealized Loss Position for 12 Months or Longer (Details) - USD ($) $ in Thousands | Oct. 31, 2023 | Jul. 31, 2023
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Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 622 | $ 570
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,855 | 4,115
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 66 | 86
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 639 | 816
Corporate Bond Securities [Member] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 556 | 484
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 3,216 | $ 3,299

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