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Note 7 - Goodwill (Details) (USD $)
3 Months Ended 12 Months Ended
May 31, 2014
May 31, 2014
May 31, 2013
May 31, 2012
Note 7 - Goodwill (Details) [Line Items]        
Number of Reporting Units   6    
Number of Reporting Units With Goodwill In Excess of Carrying Value   5    
Goodwill, Impairment Loss (in Dollars) $ 160,000,000 $ 160,000,000 $ 0 $ 0
Goodwill, Impaired, Accumulated Impairment Loss (in Dollars) $ 160,000,000 $ 160,000,000 $ 0  
North America Operations 1 [Member]
       
Note 7 - Goodwill (Details) [Line Items]        
Impairment Loss, As Percentage Of Goodwill 18.00% 18.00%    
Minimum [Member]
       
Note 7 - Goodwill (Details) [Line Items]        
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 45.00% 45.00%    
Maximum [Member]
       
Note 7 - Goodwill (Details) [Line Items]        
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 123.00% 123.00%