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Business Combination (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Aug. 11, 2014 | Oct. 29, 2016 | Apr. 30, 2016 | Oct. 31, 2015 | Oct. 29, 2016 | Oct. 31, 2015 | Mar. 15, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 7,712 | $ 8,116 |  | $ 7,712 |  |
Net sales |  | 169,992 |  | $ 157,668 | 327,138 | $ 307,889 |
Data Display |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of voting interests acquired | 100.00% |  |  |  |  |  |
Goodwill | $ 1,463 |  |  |  |  |  |
Property and Equipment | 1,433 |  |  |  |  |  |
Investment for Affiliates | 437 |  |  |  |  |  |
Inventory | 2,624 |  |  |  |  |  |
Accounts Receivable | 3,063 |  |  |  |  |  |
Other Current Assets | 1,892 |  |  |  |  |  |
Current Liabilities | 3,695 |  |  |  |  |  |
Long-term Obligations | 950 |  |  |  |  |  |
Data Display | Trademarks and Technology |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired finite-lived intangible asset | $ 480 |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 20 years |  |  |  |  |  |
Data Display | Customer Relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired finite-lived intangible asset | $ 84 |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 18 years |  |  |  |  |  |
ADFLOW Networks [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  | 100.00%
Property and Equipment |  |  |  |  |  |  | $ 58
Inventory |  |  |  |  |  |  | 230
Accounts Receivable |  |  |  |  |  |  | 1,283
Other Current Assets |  |  |  |  |  |  | 616
Current Liabilities |  |  |  |  |  |  | 935
Long-term Obligations |  |  |  |  |  |  | $ 1,545
Goodwill, Acquired During Period |  |  | 2,399 |  |  |  |
Business Combination, Consideration Transferred, Deferred Payments |  |  | $ 1,833 |  |  |  |
Business Combination, Contingent Consideration, Deferred Payments Term |  |  | 3 years |  |  |  |
ADFLOW Networks [Member] | Customer Relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 2,692 |  |  |  |
ADFLOW Networks [Member] | Computer Software, Intangible Asset [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 3,176 |  |  |  |
Commerical |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | 3,084 | $ 3,350 |  | 3,084 |  |
Net sales |  | $ 39,923 |  | $ 40,066 | 76,177 | $ 83,276 |
Commerical | ADFLOW Networks [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net sales |  |  |  |  | $ 4,882 |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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