Business Combinations - Adjustments to Original Purchase Price Allocation (Details) - USD ($) $ in Thousands	21 Months Ended
Apr. 30, 2016	May 02, 2015	Aug. 11, 2014
Business Acquisition [Line Items]
Goodwill	$ 8,116	$ 5,269
Data Display [Member]
Business Acquisition [Line Items]
Goodwill	1,463		$ 1,099
Goodwill, Adjustments	364
Property and equipment	1,433		1,433
Investment for affiliates	437		437
Inventory	2,624		2,773
Inventory, Adjustments	(149)
Accounts receivable	3,063		3,380
Accounts receivable, Adjustments	(317)
Other current assets	1,892		1,869
Other current assets, Adjustments	23
Current liabilities	3,695		3,616
Current liabilities, Adjustments	79
Long term debt obligations	950		950
Unpatented Technology [Member] \| Data Display [Member]
Business Acquisition [Line Items]
Intangible assets other than goodwill	480		480
Customer Relationships [Member] \| Data Display [Member]
Business Acquisition [Line Items]
Intangible assets other than goodwill	$ 84		$ 84

Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Current Assets

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to financial assets acquired in connection with a business combination for which the initial accounting was incomplete.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 4A
-Subparagraph (c)
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This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to financial liabilities assumed in connection with a business combination for which the initial accounting was incomplete.

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This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to inventory acquired in connection with a business combination for which the initial accounting was incomplete.

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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of inventory recognized as of the acquisition date.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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