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2. Marketable Securities
 12 Months Ended
May 31, 2013
Cash and Cash Equivalents [Abstract]  
2. Marketable Securities

Cost and fair value of marketable securities at May 31, are as follows:

 

    2013     2012     2011  
Cost   $ 91,272     $ 141,607     $ 152,495  
Fair Value     115,791       161,571       183,964  
Total Gains in Accumulated Other Comprehensive Income   $ 24,519     $ 19,964     $ 31,469