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Schedule of Continuous Unrealized Loss Position for 12 Months or Longer (Details) - USD ($)
$ in Thousands
Oct. 31, 2022
Jul. 31, 2022
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 711 $ 306
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,874 2,623
US Treasury Bill Securities [Member]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 106 72
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 856 892
Corporate Bond Securities [Member]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 605 234
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 3,018 $ 1,731