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Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Apr. 30, 2022 | Jul. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale, Amortized Cost |  | $ 23,262 | $ 14,021
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 1 | 41
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | (557) | (50)
Debt Securities, Available-for-sale |  | 22,706 | 14,012
Certificates of Deposit [Member] |  |  |
Debt Securities, Available-for-sale, Amortized Cost | [1] | 2,000 | 1,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | [1] |  | 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | [1] | (9) |
Debt Securities, Available-for-sale | [1] | 1,991 | 1,203
US Treasury Bill Securities [Member] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 10,964 | 1,669
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 1 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | (80) | (17)
Debt Securities, Available-for-sale |  | 10,885 | 1,652
Corporate Bond Securities [Member] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 3,957 | 6,327
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  |  | 38
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | (452) | (33)
Debt Securities, Available-for-sale |  | 3,505 | 6,332
Municipal Bonds [Member] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 6,341 | 4,825
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | (16) |
Debt Securities, Available-for-sale |  | $ 6,325 | $ 4,825
[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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- 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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