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SIGNIFICANT ACCOUNTING POLICIES AND DISCLOSURES (Details Narrative)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 28, 2016
USD ($)
Number
$ / shares
shares
May 30, 2015
USD ($)
$ / shares
shares
May 31, 2014
USD ($)
$ / shares
shares
May 28, 2011
USD ($)
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Finished goods $ 40,000 $ 33,700    
Raw material 4,400 3,200    
Work in progress 1,000 1,900    
Inventory valuation reserves 3,400 3,000    
Allowance for doubtful accounts 364 283    
Comprehensive income (loss) (200) 200 $ (100)  
Investments 9,500 34,700    
Investments - current 2,268 23,692    
Other long-term investments 7,200 10,900    
Available-for-sale Securities, Equity Securities, Noncurrent 600 600    
Proceeds from the sale of securities 300 200 200  
Gross realized gains and losses on sales 100 100 100  
Net unrealized holding losses 100 100 100  
Depreciation 2,000 1,700 1,000  
Construction in progress 2,721 1,218    
Provision for inventory 700 200 800  
Other non-current liabilities 967 1,221    
Share-based Compensation $ 548 $ 726 $ 759  
Common stock, shares authorized | shares 17,000,000      
Business acquisition, transaction costs       $ 238,800
Number of share exercised | shares 28,000 47,000 32,000  
Proceeds from share exercised $ 100      
Intrinsic value $ 100 $ 200 $ 200  
Weighted average fair value of stock option grants (in dollars per share) | $ / shares $ 1.21 $ 3.71 $ 4.53  
Total unrecognized compensation costs $ 1,200      
Total grant date fair value stock options vested $ 600      
Minimum [Member]        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Period of recognization 3 years      
Maximum [Member]        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Period of recognization 4 years      
Employees' 2011 Long-Term Incentive Compensation Plan [Member]        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Number of shares authorized | shares 1,500,000      
Number of shares for future issuance | shares 950,000      
Exercisable term (in years) 5 years      
Expiration term (in years) 10 years      
Healthcare [Member]        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Construction in progress $ 1,600      
Provision for inventory 100      
Canvys [Member]        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Construction in progress 900      
Provision for inventory 300      
Electron Device Group [Member]        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Construction in progress $ 200      
Exceeds 10% Revenue [Member] | Customer Concentration Risk [Member]        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Number of customers | Number 0      
Common Class B [Member]        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Common stock, shares authorized | shares 3,000,000