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Long-Term Debt - Mortgage (Schedule of long-term debt) (Details) - USD ($)
3 Months Ended
Oct. 31, 2019
Nov. 30, 2019
Jul. 31, 2019
Jan. 09, 2015
Less: Deferred financing costs        
Due After One Year, Total $ 4,471,454    
Bond St. Building Brooklyn NY Two [Member]        
Mortgage:        
Due Within One Year 777,736   5,298,610  
Due After One Year 4,478,184    
Less: Deferred financing costs        
Due Within One Year   11,448  
Due After One Year 6,730    
Due Within One Year, Total 777,736   5,287,162  
Due After One Year, Total $ 4,471,454    
Current Annual Interest Rate 4.375% 4.375%   3.54%
Final Payment Date Dec. 01, 2024