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Schedule of Available-for-sale Securities, Unrealized Loss Position (Details) - USD ($) $ in Thousands	Apr. 30, 2022	Jul. 31, 2021
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 557	$ 50
Debt Securities, Available-for-sale, Unrealized Loss Position	12,280	4,945
Certificates of Deposit [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	9
Debt Securities, Available-for-sale, Unrealized Loss Position	1,991
US Treasury Bill Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	80	17
Debt Securities, Available-for-sale, Unrealized Loss Position	887	1,652
Corporate Bond Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	452	33
Debt Securities, Available-for-sale, Unrealized Loss Position	3,495	$ 3,293
Municipal Bonds [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	16
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 5,907

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 55
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456

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- Definition

Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455

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