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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies (Tables)
12 Months Ended
May 27, 2018
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
   
Unrealized Gains on
Cash Flow Hedge
 
Balance as of May 28, 2017
  $
432
 
Other comprehensive income before reclassifications, net of tax effect
   
716
 
Amounts reclassified from OCI
   
 
Other comprehensive income, net
   
716
 
Balance as of May 27, 2018
  $
1,148
 
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 29, 2016
  $
343
    $
63
    $
(110
)
  $
296
 
Year Ended May 28, 2017
  $
296
    $
519
    $
(454
)
  $
361
 
Year Ended May 27, 2018
  $
361
    $
46
    $
(105
)
  $
302
 
Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block]
   
Year Ended
 
   
May 27, 2018
   
May 28, 2017
   
May 29, 2016
 
Recorded upon delivery
  $
509,096
    $
456,512
    $
458,985
 
Revenue from multiple element arrangements
   
12,531
     
8,431
     
13,400
 
Revenue from license fees, R&D contracts and royalties/profit sharing
   
2,600
     
4,833
     
4,533
 
Total
  $
524,227
    $
469,776
    $
476,918
 
Schedule of Cash and Cash Equivalents [Table Text Block]
   
May 27, 2018
   
May 28, 2017
   
May 29, 2016
 
Cash and cash equivalents
  $
2,899
    $
5,998
    $
9,968
 
Cash, discontinued operations
   
(8
)    
(589
)    
(74
)
Cash and cash equivalents presented on Statements of Cash Flows
  $
2,891
    $
5,409
    $
9,894
 
Schedule of Inventory, Current [Table Text Block]
   
Year Ended
 
   
May 27, 2018
   
May 28, 2017
 
Finished goods
  $
12,861
    $
10,015
 
Raw materials
   
15,286
     
10,158
 
Work in progress
   
3,672
     
3,447
 
Total inventories
  $
31,819
    $
23,620
 
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year Ended
 
   
May 27, 2018
   
May 28, 2017
   
May 29, 2016
 
Numerator:
                       
Net income (loss) applicable to Common Stockholders
  $
24,829
    $
10,590
    $
(11,641
)
                         
Denominator:
                       
Weighted average shares for basic net income (loss) per share
   
27,535
     
27,276
     
27,044
 
Effect of dilutive securities:
                       
Stock options and restricted stock units
   
380
     
376
     
 
Weighted average shares for diluted net income (loss) per share
   
27,915
     
27,652
     
27,044
 
                         
Diluted net income (loss) per share
  $
0.89
    $
0.38
    $
(0.43
)
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Year Ended
 
   
May 27, 2018
   
May 28, 2017
   
May 29, 2016
 
Options
  $
1,488
    $
1,230
    $
1,352
 
RSUs
   
2,915
     
2,734
     
2,113
 
Total stock-based compensation
  $
4,403
    $
3,964
    $
3,465
 
   
Year Ended
 
   
May 27, 2018
   
May 28, 2017
   
May 29, 2016
 
Cost of sales
  $
535
    $
485
    $
405
 
Research and development
   
131
     
83
     
90
 
Selling, general and administrative
   
3,737
     
3,396
     
2,970
 
Total stock-based compensation
  $
4,403
    $
3,964
    $
3,465
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Year Ended
 
   
May 27, 2018
   
May 28, 2017
   
May 29, 2016
 
Expected life (in years)
   
3.50
     
3.50
     
3.38
 
Risk-free interest rate
   
1.73
%
   
1.08
%
   
1.09
%
Volatility
   
27
%
   
26
%
   
31
%
Dividend yield
   
0
%
   
0
%
   
0
%
Schedule of Effect of Significant Unobservable Inputs for Investment [Table Text Block]
   
At May 27, 2018
   
At May 28, 2017
 
Revenue growth rates
   
6
%    
4
%
Expense growth rates
   
6
%    
4
%
Income tax rates
   
15
%    
15
%
Discount rates
   
12
%    
12
%
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 27, 2018
 
10% increase in revenue growth rates
  $
9,700
 
10% increase in expense growth rates
  $
(9,100
)
10% increase in income tax rates
  $
(500
)
10% increase in discount rates
  $
(4,300
)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Fair Value at May 27, 2018
   
Fair Value at May 28, 2017
 
Assets (liabilities):
 
Level 1
   
Level 2
   
Level 3
   
Level 1
   
Level 2
   
Level 3
 
Interest rate swap (1)
  $
    $
1,529
    $
    $
    $
688
    $
 
Investment in non-public company
   
     
     
66,500
     
     
     
63,600
 
Contingent consideration liability (2)
   
     
     
(4,000
)    
     
     
(5,900
)
Total
  $
    $
1,529
    $
62,500
    $
    $
688
    $
57,700