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Marketable Securities and Investments (Details 1) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
May 31, 2013
Amortized cost and fair value of marketable securities by contractual maturity    
Amortized cost, Due in one year or less $ 0  
Amortized cost, Due after one through five years 0  
Amortized cost, Due after five through twenty years 1,825  
Amortized cost 1,825 2,153
Fair Value, Due in one year or less 0  
Fair Value, Due after one through five years 0  
Fair Value, Due after five through twenty years 1,809  
Fair Value, Total $ 1,809