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Income tax provision (Details) (USD $)	12 Months Ended
Income tax provision (Details) (USD $)	May 31, 2013	May 31, 2012
Income tax provision
Income tax benefit at statutory rate	$ (2,771,162)	$ (2,756,308)
Valuation allowance	2,771,162	2,756,308
Net Income tax provision	$ 0	$ 0
Federal and state income tax rates	39.00%	39.00%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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