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Investments
 12 Months Ended
May 31, 2013
Investments [Abstract]  
Investments
NOTE 3   Investments

The following is a summary of investments:

 

                         
    Gross
Amortized
Costs		     Gross
Unrealized
Gain		     Fair
Value		  
    (Dollars in thousands)  

May 31, 2013

                        

U. S. Treasury Bills

   $ 4,000     $ —     $ 4,000  
   

 

 

    

 

 

    

 

 

  

May 31, 2012

                        

U. S. Treasury Bills

   $ 16,998     $ 5     $ 17,003  
   

 

 

    

 

 

    

 

 

  

The fair value is determined by a secondary market for U.S. Government Securities. At May 31, 2012, the U.S. Treasury Bills matured within four months. At May 31, 2013, the U.S. Treasury Bills matures within three months.