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Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Feb. 24, 2013
Schedule of Effect of Significant Unobservable Inputs for Investement [Table Text Block]
      At February 24, 2013       At May 27, 2012  
Revenue growth rates
  3%
to
12%     3%
to
24%  
Expense growth rates
  3%
to
9%     3%
to
18%  
Income tax rates
    15%         25%    
Discount rates
  19%
to
29%     14%
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
February 24, 2013
 
10% increase in revenue growth rates
  $ 1,350  
10% increase in expense growth rates
  $ (1,050 )
10% increase in income tax rates
  $ (75 )
10% increase in discount rates
  $ (825 )
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Fair Value at February 24, 2013
   
Fair Value at May 27, 2012
 
   
Level 1
   
Level 2
   
Level 3
   
Level 1
   
Level 2
   
Level 3
 
Assets:
                                               
Marketable securities
  $ 3,790     $ -     $ -     $ -     $ -     $ -  
Investment in private company
    -       -       27,800       -       -       21,500  
Total
  $ 3,790     $ -     $ 27,800     $ -     $ -     $ 21,500  
                                                 
Liabilities:
                                               
Contingent consideration
  $ -     $ -     $ -     $ -     $ -     $ 3,933  
Interest rate swap
    -       203       -       -       347       -  
Total
  $ -     $ 203     $ -     $ -     $ 347     $ 3,933