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Property disposition (Details) - USD ($)
3 Months Ended
Feb. 08, 2019
Jan. 31, 2020
Real Estate Properties [Line Items]    
Special dividend paid   $ 676,000
Pathmark supermarket in Patchogue [Member]    
Real Estate Properties [Line Items]    
Agreed sales price of property held for sale $ 7,500,000  
Rental properties 6,200,000  
Capital gain 800,000  
Net cash 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