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Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jul. 31, 2023 | Jul. 31, 2022
--- | --- | ---
Debt Securities, Available-for-Sale, Amortized Cost |  | $ 43,059 | $ 22,849
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  | 1
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (645) | (547)
Debt Securities, Available-for-Sale |  | 42,414 | 22,303
Certificates of Deposit [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | [1] | 4,080 | 2,000
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | [1] |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | [1] | (4) | (14)
Debt Securities, Available-for-Sale | [1] | 4,076 | 1,986
US Treasury Bill Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 31,186 | 13,848
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (148) | (114)
Debt Securities, Available-for-Sale |  | 31,038 | 13,734
US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 3,881 |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (8) |
Debt Securities, Available-for-Sale |  | 3,873 |
Corporate Bond Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 3,912 | 3,966
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  | 1
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (485) | (416)
Debt Securities, Available-for-Sale |  | $ 3,427 | 3,551
Municipal Bonds [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  |  | 3,035
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  |  | (3)
Debt Securities, Available-for-Sale |  |  | $ 3,032
[1] | Each of the certificates of deposit held by the Company has a CUSIP, was purchased in the secondary market through a broker and may be sold in the secondary market.

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