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Note 9 - Fair Value (Tables)
9 Months Ended
Feb. 29, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]
         
Fair Value at Reporting Date Using
 
Description
 
February 29, 2012
   
Level 1
   
Level 2
   
Level 3
 
                         
Derivatives
                       
Interest rate swaps (included in other liabilities)
  $ (1,906 )   $ -     $ (1,906 )   $ -  
Total derivatives
  $ (1,906 )   $ -     $ (1,906 )   $ -