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Stockholders' Equity (Details Narrative) - USD ($)
Sep. 02, 2016
Sep. 08, 2003
May 31, 2018
May 31, 2017
Number of shares issued   50,000    
Preferred stock par value   $ 0.0001 $ 0.0001 $ 0.0001
Number of shares issued, value   $ 5,000,000    
Preferred stock stated value   $ 100    
Preferred stock dividend rate   3.25%    
Debt conversion price   $ 1.50    
Aggregate shares of common stock   3,333,333    
Common stock price per share $ 0.24      
Warren F. Kruger [Member]        
Issuance of warrants to purchase shares of common stock 250,000      
Warrants exercise price per share $ 0.01      
Robert B. Rosene, Jr. [Member]        
Issuance of warrants to purchase shares of common stock 250,000      
Warrants exercise price per share $ 0.01      
Warren F. Kruger, President and CEO, and Robert B. Rosene, Jr., Member of Greystone's Board [Member]        
Warrants expiration date Jan. 10, 2027      
Capitalized debt issue cost $ 120,000