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Note 7 - Goodwill (Tables)
 6 Months Ended
Nov. 30, 2016
Notes Tables  
Schedule of Goodwill [Table Text Block]
   
November 30, 2016
    
May 31, 2016
  
                 
Balance at beginning of period
   $
857,023
      
842,258
  
Additions:
                
Acquisition of businesses
    
-
      
15,131
  
Foreign currency translation adjustment
    
(2,607
 )    
(366
 )
Balance at end of period
   $
854,416
      
857,023