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Business Combination (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 11, 2014
Jul. 30, 2016
Apr. 30, 2016
Aug. 01, 2015
Mar. 15, 2016
Business Acquisition [Line Items]          
Goodwill   $ 7,894 $ 8,116    
Net sales   157,146   $ 150,221  
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         513
Current Liabilities         935
Long-term Obligations         $ 1,545
Goodwill, Acquired During Period     2,502    
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   3,230 $ 3,350    
Net sales   36,254   $ 43,210  
Commerical | ADFLOW Networks [Member]          
Business Acquisition [Line Items]          
Net sales   $ 2,026