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Property dispositions (Details) - USD ($)
12 Months Ended
Feb. 08, 2019
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Real Estate Properties [Line Items]        
Agreed sales price of property held for sale   $ 7,060,000
Gain on sale of property held for sale   $ 836,000
Special dividend paid   $ 676,000    
Pathmark Super Center, Patchogue, NY [Member]        
Real Estate Properties [Line Items]        
Rental properties $ 6,200,000      
Agreed sales price of property held for sale 7,500,000      
Gain on sale of property held for sale 800,000      
Net proceeds from sale of property 2,000,000      
Mortgage payoff $ 5,200,000      
Dividend per share $ 0.10      
Sale of property operating loss $ 800,000      
Price per share operating loss eliminated from sale of property $ 0.12