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Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands		Jan. 31, 2024	Jul. 31, 2023
Debt Securities, Available-for-Sale, Amortized Cost		$ 31,860	$ 43,059
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		14
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(455)	(645)
Debt Securities, Available-for-Sale		31,419	42,414
Certificates of Deposit [Member]
Debt Securities, Available-for-Sale, Amortized Cost	[1]	960	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]		(4)
Debt Securities, Available-for-Sale	[1]	960	4,076
US Treasury Bill Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost		23,738	31,186
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		12
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(76)	(148)
Debt Securities, Available-for-Sale		23,674	31,038
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost		3,261	3,881
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		1
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(3)	(8)
Debt Securities, Available-for-Sale		3,259	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		1
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(376)	(485)
Debt Securities, Available-for-Sale		$ 3,526	$ 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.

X

- 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://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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+ References

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