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Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands		Jul. 31, 2021	Jul. 31, 2020
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 14,021	$ 18,321
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		41	58
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		(50)	(16)
Debt Securities, Available-for-sale		14,012	18,363
Certificates of Deposit [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	[1]	1,200	13,844
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	[1]	3	58
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	[1]
Debt Securities, Available-for-sale	[1]	1,203	13,902
US Treasury Bill Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		1,669	2,498
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		(17)
Debt Securities, Available-for-sale		1,652	2,498
Corporate Bond Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		6,327
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		38
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		(33)
Debt Securities, Available-for-sale		6,332
Municipal Bonds [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		4,825	1,979
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax			(16)
Debt Securities, Available-for-sale		$ 4,825	$ 1,963
[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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