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Schedule of Available-for-sale Securities, Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jan. 31, 2023	Jul. 31, 2022
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	$ 585	$ 547
Debt Securities, Available-for-Sale, Unrealized Loss Position	17,273	21,646
US Treasury Bill Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	94	114
Debt Securities, Available-for-Sale, Unrealized Loss Position	11,315	13,734
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	4
Debt Securities, Available-for-Sale, Unrealized Loss Position	2,508
Corporate Bond Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	487	416
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 3,450	3,514
Certificates of Deposit [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss		14
Debt Securities, Available-for-Sale, Unrealized Loss Position		1,986
Municipal Bonds [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss		3
Debt Securities, Available-for-Sale, Unrealized Loss Position		$ 2,412

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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