Schedule of Continuous Unrealized Loss Position for 12 Months or Longer (Details) - USD ($) $ in Thousands	Apr. 30, 2024	Jul. 31, 2023
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