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Mortgage financings and line of credit (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 05, 2021
Sep. 30, 2020
Apr. 03, 2019
Feb. 07, 2018
Feb. 28, 2020
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Oct. 31, 2020
Debt Instrument [Line Items]                    
Available to draw               $ 104,000 $ 183,000  
Deferred loan payments           $ 1,013,000   1,013,000    
Repayments Of Loan               162,000   $ 162,000
Legal fees           733,000 $ 601,000 1,842,000 $ 601,000  
Westwood Hills Property [Member]                    
Debt Instrument [Line Items]                    
Fixed rate mortgage loans   $ 19,200,000                
Loan amount, new           $ 25,000,000   $ 25,000,000    
Basis points, interest rate   4.00%                
Interest rate           4.15%   4.15%    
Membership interest percentage   40.00%                
Maturity date of loan   Oct. 01, 2022                
Available to draw   $ 25,000,000                
Legal fees   250,000                
Westwood Hills Property [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Fixed rate mortgage loans   $ 2,200,000                
Fixed interest rate on old loan   4.15%                
Westwood Hills Property [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Fixed rate mortgage loans   $ 5,600,000                
Fixed interest rate on old loan   4.62%                
M&T Bank [Member]                    
Debt Instrument [Line Items]                    
Loan amount     $ 22,500,000     $ 21,300,000   $ 21,300,000    
Basis points, interest rate     2.40%         2.55%    
Interest rate cap           2.68%   2.68%    
Maturity date of loan     May 01, 2020              
Extended maturity date of loan     Nov. 01, 2020         Jan. 31, 2023    
Maturity date of interest rate cap               Jan. 31, 2022    
Monthly payment of loan     $ 47,250         $ 49,250    
Wells Fargo Bank [Member]                    
Debt Instrument [Line Items]                    
Fixed rate mortgage loans       $ 500,000            
Loan amount       118,500,000            
Principal payments per quater       750,000            
Aareal Capital Corporation [Member]                    
Debt Instrument [Line Items]                    
Loan amount $ 118,500,000     $ 118,500,000   $ 117,000,000   $ 117,000,000    
Basis points, interest rate       2.85%            
Interest rate cap 3.00%     3.00%   2.95%   2.95%    
Maturity date of loan Feb. 06, 2022     Feb. 06, 2021            
Available to draw       $ 3,380,000            
Monthly payment of loan       $ 121,900,000            
Grande Rotunda LLC [Member]                    
Debt Instrument [Line Items]                    
Loan amount available         $ 121,900,000          
Interest rate cap         3.00%          
Maturity date of interest rate cap         Mar. 05, 2020          
Provident Bank [Member]                    
Debt Instrument [Line Items]                    
Loan amount           $ 13,000,000   $ 13,000,000    
Basis points, interest rate               0.25%    
Interest rate cap           3.75%   3.75%    
Line of credit, maximum borrowing capacity           $ 13,000,000   $ 13,000,000   $ 13,000,000