6. Stock Options	3 Months Ended
Aug. 31, 2013
Share-based Compensation [Abstract]
6. Stock Options	Effective June 1, 2012, Greystone issued stock options to purchase 2,100,000 shares of its common stock to certain of its directors, officers and employees and cancelled options to purchase 1,300,000 shares. The new options are for a ten year period and are vested at the rate of 25% per year beginning with the first anniversary of the date of the grant. The fair value of the options, $213,696 as of the issuance date, is to be expensed ratably over the vesting period of four years. Stock compensation costs were $13,356 for the three months ended August 31, 2013 and 2012, respectively. The unexpensed cost at August 31, 2013 totaled $146,916.

- Definition

The entire disclosure for freestanding option contracts issued by an entity that are indexed to, and potentially settled in, an entity's own stock. Includes disclosure on the strike price and the number of shares to which the contract is indexed, the settlement date or dates of the contract, and the issuer's accounting for the contract. If the terms of the contract provide settlement alternatives, those settlement alternatives are disclosed, including who controls the settlement alternatives, and the maximum number of shares that could be required to be issued, to net share settle the contract, if applicable. If a contract does not have a fixed or determinable maximum number of shares that could be required to be issued, the fact that a potentially infinite number of shares that may be required to be issued to settle the contract is disclosed. Disclosure also includes the contract's current fair value for each settlement alternative and how changes in the price of the issuer's equity instruments affect those settlement amounts.

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