ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) shares in Thousands, ft² in Millions		1 Months Ended			3 Months Ended								12 Months Ended
		Aug. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2013 USD ($) Property	Oct. 31, 2016 USD ($) ft² Property	Jul. 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Jan. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	Jul. 31, 2015 USD ($)	Apr. 30, 2015 USD ($)	Jan. 31, 2015 USD ($)	Oct. 31, 2016 USD ($) ft² Property shares	Oct. 31, 2015 USD ($) shares	Oct. 31, 2014 USD ($) shares
Business [Abstract]
Number of properties the Company owned or had equity interest in | Property					75								75
Gross leasable area of properties the Company owned or had equity interest in | ft²					5.0								5.0
Federal Income Taxes [Abstract]
Minimum real estate trust taxable income required to be distributed for REIT to be nontaxable													90.00%
Property Held for Sale and Discontinued Operations [Abstract]
Gain on sale of properties													$ 0	$ 20,377,000	$ 36,872,000
Revenues					$ 31,899,000	$ 28,276,000	$ 29,166,000	$ 27,451,000	$ 27,937,000	$ 28,819,000	$ 30,050,000	$ 28,506,000	116,792,000	115,312,000	102,328,000
Depreciation and amortization													(23,025,000)	(22,435,000)	(19,249,000)
Net Income													34,605,000	50,212,000	65,758,000
Deferred Charges [Abstract]
Accumulated amortization of deferred charges					3,703,000				3,108,000				3,703,000	3,108,000
Revenue Recognition [Abstract]
Rents receivable					$ 16,829,000				15,570,000				$ 16,829,000	15,570,000
Allowance of doubtful accounts against tenants receivables, percentage of deferred straight-line rents receivable					10.00%								10.00%
Tenants receivable, allowance for doubtful accounts					$ 4,097,000				3,668,000				$ 4,097,000	3,668,000
Provision for uncollectible tenants receivable													1,161,000	1,271,000	917,000
Derivative Financial Instruments [Abstract]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	[1],[2]				13,500,000								13,500,000
Comprehensive income [Abstract]
Net unrealized losses on an interest rate swap agreement included in accumulated other comprehensive income					1,304,000				1,230,000				1,304,000	1,230,000
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income applicable to common stockholders - basic					6,750,000	$ 5,040,000	$ 4,769,000	$ 2,877,000	23,995,000	$ 4,870,000	$ 3,677,000	$ 2,117,000	19,436,000	34,659,000	49,469,000
Discontinued Operations, Disposed of by Sale [Member]
Property Held for Sale and Discontinued Operations [Abstract]
Number of non-core real estate properties sold | Property				2
Number of core properties held for sale | Property				1
Sale price of property sold				$ 18,100,000
Gain on sale of properties				$ 12,500,000
Property operating expense													0	0	0
Revenues													0	0	141,000
Property operating expense													0	0	0
Depreciation and amortization													0	0	0
Income from discontinued operations													0	0	141,000
Cash flows from operating activities													0	0	(13,131,000)
Cash flows from investing activities													0	0	14,314,000
Cash flows from financing activities													0	0	0
Class A Common Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income applicable to common stockholders - basic													15,294,000	27,247,000	38,068,000
Stock awards													(236,000)	(431,000)	(723,000)
Net income applicable to common stockholders - diluted													$ 15,058,000	$ 26,816,000	$ 37,345,000
Denominator for basic EPS - weighted average common shares (in shares) | shares													26,921	26,141	23,208
Restricted stock awards (in shares) | shares													191	191	219
Denominator for diluted EPS - weighted average common equivalent shares (in shares) | shares													27,112	26,332	23,427
Minimum [Member]
Income Tax Contingency [Line Items]
Tax years remaining open to examination by Internal Revenue Service													2013
Maximum [Member]
Income Tax Contingency [Line Items]
Tax years remaining open to examination by Internal Revenue Service													2015
Real Estate Investment Properties [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life													30 years
Real Estate Investment Properties [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life													40 years
Property Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life													10 years
Property Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life													20 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life													3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life													10 years
Tenant Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life													shorter of the life of the related leases or their useful life
Tenant Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life													5 years
Tenant Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life													20 years
Common Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income applicable to common stockholders - basic													$ 4,142,000	$ 7,412,000	$ 11,401,000
Stock awards													236,000	431,000	723,000
Net income applicable to common stockholders - diluted													$ 4,378,000	$ 7,843,000	$ 12,124,000
Denominator for basic EPS - weighted average common shares (in shares) | shares													8,241	8,059	7,801
Restricted stock awards (in shares) | shares													669	669	735
Denominator for diluted EPS - weighted average common equivalent shares (in shares) | shares													8,910	8,728	8,536
Interest Rate Swap [Member]
Derivative Financial Instruments [Abstract]
Mortgage loans subject to interst rate swap					$ 34,800,000								$ 34,800,000
Average fixed annual rate on interest rate swap					3.79%								3.79%
Deferred liabilities relating to fair value of interest rate swap					$ 1,726,000				$ 1,230,000				$ 1,726,000	$ 1,230,000
Ridgeway Mortgage Refinanced Loan [Member]
Derivative Financial Instruments [Abstract]
Average fixed annual rate on interest rate swap					3.398%								3.398%
Deferred assets relating to fair value of interest rate swap					$ 422,000								$ 422,000
Derivative, Nonmonetary Notional Amount					50,000,000								50,000,000
Ridgeway Existing Mortgage [Member]
Derivative Financial Instruments [Abstract]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages					$ 50,000,000								$ 50,000,000
Accounting Standards Update 2014-08 [Member] | Springfield Property and Meriden Property [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Property Held for Sale and Discontinued Operations [Abstract]
Revenues													5,638,000	6,126,000	$ 12,411,000
Property operating expense													(1,340,000)	(3,244,000)	(5,689,000)
Depreciation and amortization													(476,000)	(1,787,000)	(2,767,000)
Net Income													3,822,000	1,095,000	3,955,000
Property operating expense													$ 1,340,000	$ 3,244,000	$ 5,689,000
Accounting Standards Update 2014-08 [Member] | Springfield, MA [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Property Held for Sale and Discontinued Operations [Abstract]
Sale price of property sold			$ 31,000,000
Gain on sale of properties			$ 24,300,000
Accounting Standards Update 2014-08 [Member] | Meriden, CT [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Property Held for Sale and Discontinued Operations [Abstract]
Sale price of property sold		$ 44,500,000
Gain on sale of properties		$ 20,400,000

[1] At October 31, 2016 no mortgage loans were delinquent in payment of currently due principal or interest.

[2] There are no prior liens for any of the Mortgage Loans on Real Estate.