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Debt Securities (Details) - Schedule of available-for-sale securities, unrealized loss position - USD ($) $ in Thousands	Jan. 31, 2021	Jul. 31, 2020
Debt Securities (Details) - Schedule of available-for-sale securities, unrealized loss position [Line Items]
Unrealized Losses	$ 26
Fair Value	3,357
U.S. Treasury bills and notes [Member]
Debt Securities (Details) - Schedule of available-for-sale securities, unrealized loss position [Line Items]
Unrealized Losses	9
Fair Value	1,667
Corporate bonds [Member]
Debt Securities (Details) - Schedule of available-for-sale securities, unrealized loss position [Line Items]
Unrealized Losses	17
Fair Value	$ 1,690
Municipal Bonds [Member]
Debt Securities (Details) - Schedule of available-for-sale securities, unrealized loss position [Line Items]
Unrealized Losses		$ 16
Fair Value		$ 1,963

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- References

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

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