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Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Oct. 31, 2022 | Jul. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale, Amortized Cost |  | $ 20,579 | $ 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 |  | (768) | (547)
Debt Securities, Available-for-sale |  | 19,811 | 22,303
Certificates of Deposit [Member] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | [1] | 2,000 | 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] | (3) | (14)
Debt Securities, Available-for-sale | [1] | 1,997 | 1,986
US Treasury Bill Securities [Member] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 13,894 | 13,848
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | (114) | (114)
Debt Securities, Available-for-sale |  | 13,780 | 13,734
Corporate Bond Securities [Member] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 3,954 | 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 |  | (650) | (416)
Debt Securities, Available-for-sale |  | 3,304 | 3,551
Municipal Bonds [Member] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 731 | 3,035
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | (1) | (3)
Debt Securities, Available-for-sale |  | $ 730 | $ 3,032
[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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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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