Organization and significant accounting policies (Narrative) (Details) - USD ($)	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Organization and significant accounting policies [Abstract]
Advertising costs	$ 162,000	$ 133,000	$ 93,000
Amortization of mortgage costs and leasing commissions	$ 419,000	$ 359,000	$ 370,000