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Note 7 - Inventories (Tables)
9 Months Ended
Feb. 28, 2016
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
February 28,
2016
   
May 31,
2015
 
Finished goods
  $ 12,764     $ 13,271  
Raw materials
    11,306       9,879  
Work in progress
    3,091       1,877  
Total
  $ 27,161     $ 25,027