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Organization and significant accounting policies (Narrative) (Details) - USD ($)
12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Feb. 28, 2020
Advertising costs $ 421,000 $ 297,000 $ 281,000  
Amortization of mortgage costs and leasing commissions 1,109,000 $ 1,089,000 $ 1,139,000  
Consolidated impact to net income (loss) $ 4,400,000      
S And A Commercial Associates Limited Partnership [Member]        
Percentage of ownership interest       65.00%
Pierre Towers, LLC [Member]        
Percentage of ownership interest       100.00%
TIC Agreement [Member]        
Percentage of ownership interest       65.00%