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Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables)
6 Months Ended
Nov. 30, 2014
Notes Tables  
Schedule Of Effect Of Significant Unobservable Inputs For Investment [TableText Block]
   
At November 30, 2014
   
At May 25, 2014
 
Revenue growth rates
    4%       4%  
Expense growth rates
    4%       4%  
Income tax rates
    15%       15%  
Discount rates
    16% to 22%       16% to 22%  
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 November 30, 2014
 
10% increase in revenue growth rates
  $ 4,900  
10% increase in expense growth rates
  $ (4,100 )
10% increase in income tax rates
  $  
10% increase in discount rates
  $ (700 )
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Fair Value at November 30, 2014
   
Fair Value at May 25, 2014
 
 
 
Level 1
   
Level 2
   
Level 3
   
Level 1
   
Level 2
   
Level 3
 
Assets:                                    
Investment in private company
    -       -       59,000       -       -       39,600  
Total
  $ -     $ -     $ 59,000     $ -     $ -     $ 39,600  
                                                 
Liabilities:
                                               
Interest rate swap
    -       9       -       -       44       -  
Total
  $ -     $ 9     $ -     $ -     $ 44     $ -  
Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block]
 
 
Three months
ended
November 30
, 2014
 
 
Three months
ended
November 24
, 201
3
 
 
Six months
ended
November 30
, 2014
 
 
Six months
ended
November 24
, 201
3
 
Recorded upon shipment
  $ 109,764     $ 95,002     $ 216,004     $ 182,412  
Recorded upon acceptance in foreign port
    22,106       22,940       48,693       44,329  
Revenue from license fees, R&D contracts and royalties/profit sharing
    423       143       635       201  
Revenue from multiple element arrangements
    372       1,941       947       2,563  
Total
  $ 132,665     $ 120,026     $ 266,279     $ 229,505