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Debt Securities (Details) - Schedule of available-for-sale securities - USD ($) $ in Thousands		Jul. 31, 2020	Jul. 31, 2019
Marketable Securities [Line Items]
Amortized Cost		$ 18,321	$ 2,534
Gross Unrealized Gains		58
Gross Unrealized Losses		(16)
Fair Value		18,363	2,534
Municipal bonds [Member]
Marketable Securities [Line Items]
Amortized Cost	[1]	13,844	2,234
Gross Unrealized Gains	[1]	58
Gross Unrealized Losses	[1]
Fair Value	[1]	13,902	2,234
U.S. Treasury bills [Member]
Marketable Securities [Line Items]
Amortized Cost		2,498
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value		2,498
Municipal bonds [Member]
Marketable Securities [Line Items]
Amortized Cost		1,979	300
Gross Unrealized Gains
Gross Unrealized Losses		(16)
Fair Value		$ 1,963	$ 300
[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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