Interest rate swap contracts (Details) - USD ($)	3 Months Ended		6 Months Ended	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Oct. 31, 2015	Apr. 22, 2016	Dec. 26, 2012
Total loan carrying amount	$ 321,190,000		$ 321,190,000	$ 307,899,000
Unrealized gain (loss) on derivatives	(143,000)	$ 808,000	(841,000)	(1,581,000)
Interest rate swap contract liabilities	1,907,000		1,907,000	1,066,000
Regency Swap [Member]
Interest rate swap contract liabilities	1,386,000		1,386,000	945,000
Damascus Centre Swap [Member]
Interest rate swap contract liabilities	521,000		521,000	$ 121,000
Provident Bank [Member]
Loan amount	16,200,000		16,200,000
Total loan carrying amount	5,000,000		5,000,000
Notional amount of interest rate swap	$ 16,200,000		$ 16,200,000
Maturity date			Dec. 15, 2024
Fixed interest rate	3.75%		3.75%
Basis points, interest rate			1.25%
Maturity date of loan			Dec. 15, 2024
People's United Bank [Member]
Total loan carrying amount	$ 21,100,000		$ 21,100,000
People's United Bank [Member] | Tranche One [Member]
Loan amount						$ 20,000,000
Notional amount of interest rate swap	$ 18,900,000		$ 18,900,000
Fixed interest rate	3.81%		3.81%
Basis points, interest rate	2.10%		2.10%
Maturity date of loan	Jan. 03, 2023		Jan. 03, 2023
People's United Bank [Member] | Tranche Two [Member]
Loan amount					$ 2,320,000
Fixed interest rate	3.53%		3.53%
Basis points, interest rate	2.10%		2.10%
Amount of loan readily available					470,000
Amount of loan held in escrow					$ 1,850,000
Maturity date of loan	Jan. 03, 2023		Jan. 03, 2023