Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands		Oct. 31, 2023	Jul. 31, 2023
Debt Securities, Available-for-Sale, Amortized Cost		$ 33,953	$ 43,059
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(711)	(645)
Debt Securities, Available-for-Sale		33,242	42,414
Certificates of Deposit [Member]
Debt Securities, Available-for-Sale, Amortized Cost	[1]	1,920	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]	(3)	(4)
Debt Securities, Available-for-Sale	[1]	1,917	4,076
US Treasury Bill Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost		25,085	31,186
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(141)	(148)
Debt Securities, Available-for-Sale		24,944	31,038
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost		3,047	3,881
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(3)	(8)
Debt Securities, Available-for-Sale		3,044	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
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax		(564)	(485)
Debt Securities, Available-for-Sale		$ 3,337	$ 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.