Organization and significant accounting policies (Narrative) (Details) - USD ($)	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017	Dec. 07, 2017
Advertising costs	$ 281,000	$ 296,000	$ 386,000
Amortization of mortgage costs and leasing commissions	$ 1,139,000	$ 1,050,000	$ 1,298,000
Transaction costs				$ 19,600,000
Station Place on Monmouth, LLC [Member]
Transaction costs				$ 550,000