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RELATED PARTY TRANSACTIONS (Details) - USD ($)		12 Months Ended
	Jan. 01, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction
Number of shares of common stock owned by the related party		16,292,000	15,728,000
Number of shares purchased by the related party under the dividend reinvestment plan		197,000	227,000	210,000
Cost of plans charged to operations		$ 2,334,000	$ 1,833,000	$ 1,440,000
Gould Investors L.P.
Related Party Transaction
Number of shares of common stock owned by the related party		1,785,976	1,704,765
Ownership percentage held by the related party		10.60%	10.50%
Number of shares purchased by the related party under the dividend reinvestment plan		81,211	106,761
Number of shares purchased by the related party in the open market			700
Amount of insurance reimbursed		$ 520,000	$ 400,000	359,000
Real estate insurance expense		339,000	250,000	178,000
Majestic
Related Party Transaction
Annual fee paid in consideration for providing services		2,339,000	2,669,000	2,725,000
Property management costs allocated to real estate expenses annually		892,500	850,000	600,000
Additional payment for the entity's share of all direct office expenses		196,000	186,000	175,000
Chairman
Related Party Transaction
Fee paid		262,500	250,000	250,000
Vice Chairman
Related Party Transaction
Fee paid		105,000	100,000	100,000
Subsidiary of Gould
Related Party Transaction
Annual lease rent		7,000	42,000	41,000
Executive officers and others
Related Party Transaction
Cost of plans charged to operations		1,245,000	1,045,000	867,000
Joint venture partners
Related Party Transaction
Financing fee received		$ 131,000
Percentage of financing fees in Other Income		50.00%
Real estate management and acquisition costs		$ 198,000	262,000	$ 107,000
Joint venture partners | Land and Building
Related Party Transaction
Real estate management and acquisition costs		117,000	$ 117,000
Corporate joint venture
Related Party Transaction
Aggregate fees paid to other partners		409,000
Decrease in equity earnings, joint venture transaction		$ 205,000
Subsequent event | Net lease tenants
Related Party Transaction
Property management fee (as a percent)	1.50%
Subsequent event | Operating lease tenants
Related Party Transaction
Property management fee (as a percent)	2.00%

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