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Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	May 31, 2012	May 31, 2013
Summary of investments
Gross Amortized Costs	$ 16,998	$ 4,000
U. S. Treasury Bills [Member]
Summary of investments
Gross Amortized Costs	16,998	4,000
Gross Unrealized Gain	5
Fair Value	$ 17,003	$ 4,000

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

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Fair value of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of unrecognized gain before loss on investments in held-to-maturity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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