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Property disposition (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Feb. 08, 2019
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Real Estate Properties [Line Items]          
Agreed sales price of property held for sale       $ 7,060
Capital gain   836
Special dividend paid       $ 676  
Pathmark supermarket in Patchogue [Member]          
Real Estate Properties [Line Items]          
Agreed sales price of property held for sale $ 7,500        
Rental properties 6,200        
Capital gain 800        
Net cash proceeds from sale of property 2,000        
Mortgage payoff $ 5,200        
Dividend per share $ 0.10        
Sale of property operating loss $ 800        
Price per share operating loss eliminated from sale of property $ 0.12