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Discontinued operations (Details) - USD ($)
12 Months Ended
Dec. 20, 2013
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sale of property   $ 3,059,000
South Brunswick property [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sale of property $ 11,000,000      
Capital gain on sale of apartments 8,700,000      
Deferred gain on sale 8,700,000      
Net proceeds on sale of business $ 9,800,000