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Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables)
12 Months Ended
May 29, 2016
Notes Tables  
Allowance for Credit Losses on Financing Receivables [Table Text Block]
 
 
Balance at beginning of period
 
 
Adjustments charged to revenue and expenses
 
 
Write offs, net of recoveries
 
 
Balance at end of period
 
Year ended May 25, 2014
  $ 583     $ 143     $ (210 )   $ 516  
Year ended May 31, 2015
  $ 516     $     $ (134 )   $ 382  
Year ended May 29, 2016
  $ 382     $ 63     $ (110 )   $ 335  
Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block]
 
 
Year ended
May
29
, 201
6
 
 
Year ended
May
31
, 201
5
 
 
Year
ended
May
25
, 201
4
 
Recorded upon shipment
  $ 458,985     $ 465,484     $ 398,938  
Recorded upon acceptance in foreign port
    64,181       67,714       69,710  
Revenue from multiple element arrangements
    13,400       4,253       6,811  
Revenue from license fees, R&D contracts and royalties
    4,533       1,806       1,354  
Total
  $ 541,099     $ 539,257     $ 476,813  
Schedule of Inventory, Current [Table Text Block]
 
 
May 29,
2016
 
 
May 31,
2015
 
Finished goods
  $ 12,165     $ 13,271  
Raw materials
    9,855       9,879  
Work in progress
    3,515       1,877  
Total inventories
  $ 25,535     $ 25,027  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Fiscal Year Ended
May 29, 2016
   
Fiscal Year Ended
May 31, 2015
   
Fiscal Year Ended
May 25, 2014
 
Numerator:
                       
Net (loss) income applicable to Common Stockholders
  $ (11,641 )   $ 13,544     $ 19,145  
                         
Denominator:
                       
Weighted average shares for basic net (loss) income per share
    27,044       26,884       26,628  
Effect of dilutive securities:
                       
Stock options and restricted stock units
          452       492  
Weighted average shares for diluted net (loss) income per share
    27,044       27,336       27,120  
                         
Diluted net (loss) income per share
  $ (0.43 )   $ 0.50     $ 0.71  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
 
 
Fiscal Year Ended
May 29, 2016
 
 
Fiscal Year Ended
May 31, 2015
 
 
Fiscal Year Ended
May 25, 2014
 
Options
  $ 1,352     $ 561     $ 558  
RSUs
    2,113       1,016       798  
Total stock-based compensation expense
  $ 3,465     $ 1,577     $ 1,356  
 
 
Fiscal Year Ended
May 29, 2016
 
 
Fiscal Year Ended
May 31, 2015
 
 
Fiscal Year Ended
May 25, 2014
 
Research and development
  $ 241     $ 38     $ 39  
Sales, general and administrative
    3,224       1,539       1,317  
Total stock-based compensation expense
  $ 3,465     $ 1,577     $ 1,356  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
 
Fiscal Year Ended
May 29, 2016
 
 
Fiscal Year Ended
May 31, 2015
 
 
Fiscal Year Ended
May 25, 2014
 
Expected life (in years)
    3.38       3.25       3.50  
Risk-free interest rate
    1.09 %     1.00 %     0.71 %
Volatility
    31 %     32 %     41 %
Dividend yield
    0 %     0 %     0 %
Schedule of Effect of Significant Unobservable Inputs for Investment [Table Text Block]
   
At May 29, 2016
   
At May 31, 2015
 
Annual consolidated revenue growth rates
    4 %       4 %
Annual consolidated expense growth rates
    4 %       4 %
Consolidated income tax rates
    15 %       15 %
Consolidated discount rates
    12.5 %   15% to  21 %
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block]
Impact on value of Windset investment as of
  May 29, 2016  
10% increase in revenue growth rates
  $ 600  
10% increase in expense growth rates
  $ (600 )
10% increase in income tax rates
  $ -  
10% increase in discount rates
  $ (300 )