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Marketable Securities (Details 2) - USD ($) $ in Thousands	Jan. 31, 2018	Jul. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	$ 158	$ 48
Fair Value	20,677	19,081
Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	1	7
Fair Value	5,340	12,155
Federal Government Sponsored Enterprise notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	26	14
Fair Value	3,190	3,529
International agency notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	9
Fair Value	390
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	39
Fair Value	3,293
Equity [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	3	26
Fair Value	76	48
U.S. Treasury notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	76
Fair Value	5,321
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	4	1
Fair Value	$ 3,067	$ 3,349

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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