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Property dispositions (Details) - USD ($)
12 Months Ended
Feb. 08, 2019
Jun. 12, 2017
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Real Estate Properties [Line Items]          
Agreed sales price of property held for sale     $ 7,060,000 $ 16,100,000
Gain on sale of property held for sale     836,000 $ 15,395,000
Special dividend paid     676,000    
Deferral of capital gain on sale of property from qualification as like-kind exchange of real estate pursuant to Section 1031 of the Internal Revenue Code     $ 15,400,000    
Hammel Gardens Property [Member]          
Real Estate Properties [Line Items]          
Rental properties   $ 700,000      
Agreed sales price of property held for sale   17,000,000      
Gain on sale of property held for sale   15,400,000      
Mortgage prepayment penalty   1,100,000      
Net proceeds from sale of property   8,000,000      
Net proceeds from sale of property to be held in escrow until replacement property is purchased   7,000,000      
Deferral of capital gain on sale of property from qualification as like-kind exchange of real estate pursuant to Section 1031 of the Internal Revenue Code   $ 15,400,000      
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