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Mortgage financings and line of credit (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 03, 2019
Feb. 07, 2018
Aug. 26, 2019
Oct. 27, 2017
Feb. 28, 2020
Apr. 30, 2020
Oct. 31, 2019
Debt Instrument [Line Items]              
Deferred payments of loan           $ 260,000  
M&T Bank [Member]              
Debt Instrument [Line Items]              
Loan amount $ 22,500,000            
Basis points, interest rate 2.40%            
Maturity date of loan May 01, 2020            
Extended maturity date of loan Nov. 01, 2020            
Monthly payment of loan $ 47,250            
Wells Fargo Bank [Member]              
Debt Instrument [Line Items]              
Loan amount   $ 115,300,000          
Aareal Capital Corporation [Member]              
Debt Instrument [Line Items]              
Loan amount   $ 118,500,000          
Basis points, interest rate   2.85%          
Maturity date of loan   Feb. 06, 2021          
Available to draw   $ 3,380,000          
Grande Rotunda LLC [Member]              
Debt Instrument [Line Items]              
Loan amount           $ 118,500,000  
Loan amount available         $ 121,900,000    
Interest rate cap         3.00% 3.83%  
Maturity date of interest rate cap         Mar. 05, 2020    
Provident Bank [Member]              
Debt Instrument [Line Items]              
Basis points, interest rate       2.75%      
Interest rate cap             3.75%
Maturity date of loan       Oct. 31, 2022      
Term of the loan       3 years      
Line of credit, maximum borrowing capacity           $ 13,000,000 $ 13,000,000
Berdan Court, LLC [Member]              
Debt Instrument [Line Items]              
Fixed rate mortgage loans     $ 17,000,000        
Loan amount     $ 28,815,000        
Interest rate cap     3.54%        
Term of the loan     10 years        
Net proceeds from refinancing of debt     $ 11,600,000        
Percentage of acquisition     100.00%        
Berdan Court, LLC [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Fixed interest rate     3.54%        
Berdan Court, LLC [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Fixed interest rate     6.09%        
WestFREIT, Corp [Member]              
Debt Instrument [Line Items]              
Percentage of acquisition 100.00%