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Summary of Significant Accounting Policies (Details) (USD $)	May 31, 2013	May 31, 2012	Jun. 01, 2011
Summary of cash and cash equivalents
Cash in banks.	$ 1,562,939	$ 4,665,956
Money market funds	318,222	2,848,793
Total	$ 1,881,161	$ 7,514,749	$ 4,645,854

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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