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Organization and significant accounting policies (Details) - USD ($)
12 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Oct. 31, 2020
Feb. 28, 2020
Organization and significant accounting policies (Details) [Line Items]        
Investment trust, percentage 90.00%      
Noncontrolling interests in subsidiaries, percentage 100.00%      
Tenant improvements $ 7,300,000      
Consolidated impact to net income (loss) 4,400,000      
Amortization costs, interest expense 971,000 $ 1,109,000 $ 1,089,000  
Advertising costs $ 234,000 $ 421,000 $ 297,000  
S And A Commercial Associates Limited Partnership [Member]        
Organization and significant accounting policies (Details) [Line Items]        
Noncontrolling interests in subsidiaries, percentage       100.00%
Percentage of ownership interest       65.00%
Pierre Towers, LLC [Member]        
Organization and significant accounting policies (Details) [Line Items]        
Percentage of ownership interest       100.00%
TIC Agreement [Member]        
Organization and significant accounting policies (Details) [Line Items]        
Percentage of ownership interest       65.00%
FREIT [Member]        
Organization and significant accounting policies (Details) [Line Items]        
Ownership interest, percentage 40.00%