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Investments (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	May 31, 2012
Summary of investments
Gross Amortized Costs	$ 6,000	$ 16,998
U. S. Treasury Bills [Member]
Summary of investments
Gross Amortized Costs	6,000	16,998
Gross Unrealized (Losses) Gains		5
Fair Value	$ 6,000	$ 17,003

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This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities within one year of the balance sheet date or the normal operating cycle, whichever is longer; such investments are measured at amortized cost (carrying value). The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

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