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Note 10 - Stockholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Aug. 31, 2014
Jul. 14, 2010
Note 10 - Stockholders' Equity (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 469  
Common Stock, Capital Shares Reserved for Future Issuance 3,100,000  
Stock Repurchase Program, Authorized Amount (in Dollars)   $ 10
Stock Repurchased During Period, Shares 0  
Restricted Stock [Member]
   
Note 10 - Stockholders' Equity (Details) [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 29,496