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Marketable Securities (Details 2) - USD ($) $ in Thousands	Oct. 31, 2017	Jul. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	$ 57	$ 48
Fair Value	22,817	19,081
Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	2	7
Fair Value	7,040	12,155
Federal Government Sponsored Enterprise notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	17	14
Fair Value	3,200	3,529
International agency notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	3
Fair Value	399
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	4
Fair Value	2,737
Equity [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	6	26
Fair Value	69	48
U.S. Treasury notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	22
Fair Value	5,374
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized Losses	3	1
Fair Value	$ 3,998	$ 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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