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