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Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands		Apr. 30, 2023	Jul. 31, 2022
Debt Securities, Available-for-Sale, Amortized Cost		$ 42,452	$ 22,849
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		91	1
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(556)	(547)
Debt Securities, Available-for-Sale		41,987	22,303
Certificates of Deposit [Member]
Debt Securities, Available-for-Sale, Amortized Cost	[1]	4,080	2,000
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	[1]	4
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	[1]	(1)	(14)
Debt Securities, Available-for-Sale	[1]	4,083	1,986
US Treasury Bill Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost		30,560	13,848
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax		85
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(93)	(114)
Debt Securities, Available-for-Sale		30,552	13,734
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost		3,858
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(6)
Debt Securities, Available-for-Sale		3,852
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		2	1
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(456)	(416)
Debt Securities, Available-for-Sale		$ 3,500	3,551
Municipal Bonds [Member]
Debt Securities, Available-for-Sale, Amortized Cost			3,035
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax			(3)
Debt Securities, Available-for-Sale			$ 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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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).

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