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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies (Tables)
12 Months Ended
May 25, 2014
Accounting Policies [Abstract]  
Allowance for Credit Losses on Financing Receivables [Table Text Block]
   

Balance at

beginning of

period

   

Additions from

acquisitions and

adjustments

charged to revenue

and expenses

   

Write offs, net of

recoveries

   

Balance at end of

period

 

Year ended May 27, 2012

  $ 342     $ 248     $ (78)     $ 512  
                                 

Year ended May 26, 2013

  $ 512     $ 109     $ (38)     $ 583  
                                 

Year ended May 25, 2014

  $ 583     $ 143     $ (210)     $ 516  
Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block]
   

Year ended

May 25, 2014

   

Year ended

May 26, 2013

 

Recorded upon shipment

  $ 398,938     $ 359,518  

Recorded upon acceptance in foreign port

    69,710       78,442  

Revenue from license fees, R&D contracts and royalties/profit sharing

    1,354       1,975  

Revenue from multiple element arrangements

    6,811       1,773  

Total

  $ 476,813     $ 441,708  
Schedule of Inventory, Current [Table Text Block]
   

May 25,

2014

   

May 26,

2013

 

Finished goods

  $ 11,111     $ 11,297  

Raw materials

    10,376       9,290  

Work in progress

    3,248       3,526  

Inventories, net

  $ 24,735     $ 24,113  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   

Fiscal Year

Ended

May 25, 2014

   

Fiscal Year

Ended

May 26, 2013

   

Fiscal Year 

Ended 

May 27, 2012

 

Numerator:

                       

Net income applicable to Common Stockholders

  $ 19,145     $ 22,587     $ 12,696  

Denominator:

                       

Weighted average shares for basic net income per share

    26,628       25,830       25,849  

Effect of dilutive securities:

                       

Stock options and restricted stock units

    492       796       277  

Weighted average shares for diluted net income per share

    27,120       26,626       26,126  
                         

Diluted net income per share

  $ 0.71     $ 0.85     $ 0.49  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   

Fiscal Year

Ended

May 25, 2014

   

Fiscal Year

Ended

May 26, 2013

   

Fiscal Year

Ended

May 27, 2012

 

Options

  $ 558     $ 788     $ 1,046  

RSUs

    798       907       826  

Total stock-based compensation expense

  $ 1,356     $ 1,695     $ 1,872  
   

Fiscal Year

Ended

May 25, 2014

   

Fiscal Year

Ended

May 26, 2013

   

Fiscal Year

Ended

May 27, 2012

 

Research and development

  $ 39     $ 718     $ 530  

Sales, general and administrative

    1,317       977       1,342  

Total stock-based compensation expense

  $ 1,356     $ 1,695     $ 1,872  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   

Fiscal Year Ended

May 25, 2014

   

Fiscal Year Ended

May 26, 2013

   

Fiscal Year Ended

May 27, 2012

 

Expected life (in years)

    3.50       3.76       3.76  

Risk-free interest rate

    0.71%       0.48%       0.59%  

Volatility

    0.41       0.53       0.53  

Dividend yield

    0%       0%       0%  
Schedule of Effect of Significant Unobservable Inputs for Investment [Table Text Block]
   

At May 25, 2014

   

At May 26, 2013

 

Annual consolidated revenue growth rates

    4 %     3% to 9 %

Annual consolidated expense growth rates

    4 %     3% to 8 %

Consolidated income tax rates

    15 %     15 %

Consolidated discount rates

    16% to 22 %     18% to 28 %
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 25, 2014

 

10% increase in revenue growth rates

  $ 3,200  

10% increase in expense growth rates

  $ (2,300 )

10% increase in income tax rates

     

10% increase in discount rates

  $ (1,500 )
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Fair Value at May 25, 2014

   

Fair Value at May 26, 2013

 

Assets:

 

Level 1

   

Level 2

   

Level 3

   

Level 1

   

Level 2

   

Level 3

 

Marketable securities

  $ -     $ -     $ -     $ 1,545     $ -     $ -  

Investment in private company

    -       -       39,600       -       -       29,600  

Total

  $ -     $ -     $ 39,600     $ 1,545     $ -     $ 29,600  
                                                 

Liabilities:

                                               

Interest rate swap

    -       44       -       -       163       -  

Total

  $ -     $ 44     $ -     $ -     $ 163     $ -