Stock-Based Compensation (Details) - USD ($)	3 Months Ended	12 Months Ended
Oct. 31, 2017	Jul. 31, 2017
Stock-Based Compensation (Textual)
Common stock shares reserved	64,033
Unrecognized compensation cost related to non-vested restricted share value	$ 6,433,000
Unrecognized compensation cost in fiscal 2018	2,544,000
Unrecognized compensation cost in fiscal 2019	2,705,000
Unrecognized compensation cost in fiscal 2020	1,121,000
Unrecognized compensation cost in fiscal 2021	63,000
Stock Options [Member]
Stock-Based Compensation (Textual)
Stock-based compensation	0	$ 19,000
Selling, General and Administrative Expenses [Member]
Stock-Based Compensation (Textual)
Stock-based compensation	0	78,000
Class B common stock [Member]
Stock-Based Compensation (Textual)
Stock-based compensation	$ 132,000	451,000
Restricted common stock non vested -shares	244,000
Class B common stock [Member] \| Selling, General and Administrative Expenses [Member]
Stock-Based Compensation (Textual)
Stock-based compensation	$ 819,000	$ 1,966,000

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- Definition

Amount of the unrecognized compensation cost due in next twelve months.

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Amount of the unrecognized compensation cost due within four years.

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Amount of the unrecognized compensation cost due within three years.

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Amount of the unrecognized compensation cost due within two years.

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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Number of non-vested options forfeited.

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