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Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Oct. 31, 2023 | Jul. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale, Amortized Cost |  | $ 33,953 | $ 43,059
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (711) | (645)
Debt Securities, Available-for-Sale |  | 33,242 | 42,414
Certificates of Deposit [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost | [1] | 1,920 | 4,080
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | [1] |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | [1] | (3) | (4)
Debt Securities, Available-for-Sale | [1] | 1,917 | 4,076
US Treasury Bill Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 25,085 | 31,186
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (141) | (148)
Debt Securities, Available-for-Sale |  | 24,944 | 31,038
US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 3,047 | 3,881
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (3) | (8)
Debt Securities, Available-for-Sale |  | 3,044 | 3,873
Corporate Bond Securities [Member] |  |  |
Debt Securities, Available-for-Sale, Amortized Cost |  | 3,901 | 3,912
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax |  |  |
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | (564) | (485)
Debt Securities, Available-for-Sale |  | $ 3,337 | $ 3,427
[1] | Each of the Company’s certificates of deposit has a CUSIP, was purchased in the secondary market through a broker and may be sold in the secondary market.

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