Stockholders' Equity	12 Months Ended
May 31, 2019
Equity [Abstract]
Stockholders' Equity	Note 9. STOCKHOLDERS’ EQUITY Convertible Preferred Stock In September 2003, Greystone issued 50,000 shares of Series 2003, cumulative, convertible preferred stock, par value $0.0001, for a total purchase price of $5,000,000. Each share of the preferred stock has a stated value of $100 and a dividend rate equal to the prime rate of interest plus 3.25% (8.75% at May 31, 2019) and may be converted into common stock at the conversion rate of $1.50 per share or an aggregate of 3,333,333 shares of common stock. The holder of the preferred stock has been granted certain voting rights so that such holder has the right to elect a majority of the Board of Directors of Greystone. Preferred stock dividends must be fully paid before a dividend on the common stock may be paid. Warrants to Purchase Common Stock Effective September 1, 2016, Greystone’s Board of Directors authorized the issuance of warrants to purchase 250,000 shares of Greystone’s common stock for $0.01 per share to each of Warren F. Kruger, President and CEO, and Robert B. Rosene, Jr., a member of Greystone’s Board of Directors, as compensation for providing guarantees on Greystone’s debt with IBC. The warrants are vested and expire January 10, 2027.

Stockholders' Equity

12 Months Ended

May 31, 2019

Note 9. STOCKHOLDERS’ EQUITY

Convertible Preferred Stock

In September 2003, Greystone issued 50,000 shares of Series 2003, cumulative, convertible preferred stock, par value $0.0001, for a total purchase price of $5,000,000. Each share of the preferred stock has a stated value of $100 and a dividend rate equal to the prime rate of interest plus 3.25% (8.75% at May 31, 2019) and may be converted into common stock at the conversion rate of $1.50 per share or an aggregate of 3,333,333 shares of common stock. The holder of the preferred stock has been granted certain voting rights so that such holder has the right to elect a majority of the Board of Directors of Greystone. Preferred stock dividends must be fully paid before a dividend on the common stock may be paid.

Warrants to Purchase Common Stock

Effective September 1, 2016, Greystone’s Board of Directors authorized the issuance of warrants to purchase 250,000 shares of Greystone’s common stock for $0.01 per share to each of Warren F. Kruger, President and CEO, and Robert B. Rosene, Jr., a member of Greystone’s Board of Directors, as compensation for providing guarantees on Greystone’s debt with IBC. The warrants are vested and expire January 10, 2027.