REAL ESTATE PROPERTIES REAL ESTATE PROPERTIES 2 (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) ft²	Dec. 31, 2014 USD ($) ft²	Dec. 31, 2013 USD ($) ft²
Sales of real estate properties [Line Items]
Net Sales Price of Real Estate Sold		$ 20,507,000	$ 2,960,000
Basis		11,319,000	2,162,000
Gain on Sales of Real Estate Investments	$ 2,903,000	9,188,000	0
Gain (Loss) on Disposition of Real Estate, Discontinued Operations			798,000
Depreciation and amortization from discontinued operations	0	0	(130,000)
Income from real estate operations	0	0	89,000
Gain on sales of nondepreciable real estate investments	0	0	0
Gain on sales of real estate investments	0	0	798,000
INCOME FROM DISCONTINUED OPERATIONS	$ 0	$ 0	$ 887,000
Ambassador Row Warehouse (one building sold in 2015) [Member]
Sales of real estate properties [Line Items]
Size (in square feet) of property sold | ft²	185,000
Date Of Property Sale	4/13/15
Net Sales Price of Real Estate Sold	$ 4,998,000
Basis	2,095,000
Gain on Sales of Real Estate Investments	2,903,000
Northpoint Commerce Center [Member]
Sales of real estate properties [Line Items]
Size (in square feet) of property sold | ft²		58,000
Date Of Property Sale		3/28/2014
Net Sales Price of Real Estate Sold		$ 3,471,000
Basis		3,376,000
Gain on Sales of Real Estate Investments		$ 95,000
Tampa West Distribution Center VI [Domain]
Sales of real estate properties [Line Items]
Size (in square feet) of property sold | ft²		9,000
Date Of Property Sale		7/8/2014
Net Sales Price of Real Estate Sold		$ 682,000
Basis		446,000
Gain on Sales of Real Estate Investments		$ 236,000
Clay Campbell Distribution Center [Member]
Sales of real estate properties [Line Items]
Size (in square feet) of property sold | ft²		118,000
Date Of Property Sale		9/30/2014
Net Sales Price of Real Estate Sold		$ 7,690,000
Basis		2,826,000
Gain on Sales of Real Estate Investments		$ 4,864,000
Kirby Business Center [Member]
Sales of real estate properties [Line Items]
Size (in square feet) of property sold | ft²		125,000
Date Of Property Sale		9/30/2014
Net Sales Price of Real Estate Sold		$ 5,306,000
Basis		2,989,000
Gain on Sales of Real Estate Investments		$ 2,317,000
Ambassador Row Warehouses (two buildings sold in 2014) [Member]
Sales of real estate properties [Line Items]
Size (in square feet) of property sold | ft²		132,000
Date Of Property Sale		12/30/2014
Net Sales Price of Real Estate Sold		$ 3,358,000
Basis		1,682,000
Gain on Sales of Real Estate Investments		1,676,000
Tampa West Distribution Center V [Member]
Sales of real estate properties [Line Items]
Size (in square feet) of property sold | ft²			12,000
Date Of Property Sale			12/20/13
Net Sales Price of Real Estate Sold			$ 609,000
Basis			442,000
Gain (Loss) on Disposition of Real Estate, Discontinued Operations			$ 167,000
Tampa West Distribution Center VII [Member]
Sales of real estate properties [Line Items]
Size (in square feet) of property sold | ft²			6,000
Date Of Property Sale			12/20/13
Net Sales Price of Real Estate Sold			$ 422,000
Basis			417,000
Gain (Loss) on Disposition of Real Estate, Discontinued Operations			$ 5,000
Tampa East Distribution Center II [Member]
Sales of real estate properties [Line Items]
Size (in square feet) of property sold | ft²			31,000
Date Of Property Sale			12/30/13
Net Sales Price of Real Estate Sold			$ 1,929,000
Basis			1,303,000
Gain (Loss) on Disposition of Real Estate, Discontinued Operations			626,000
Land [Member]
Sales of real estate properties [Line Items]
Proceeds from Sale of Property, Plant, and Equipment	170,000	118,000	1,313,000
Gain on sales of land	$ 123,000	$ 98,000	24,000
Discontinued Operations, Disposed of by Sale [Member]
Sales of real estate properties [Line Items]
Income from real estate operations			306,000
Expenses from real estate operations			(87,000)
Property net operating income from discontinued operations			219,000
Depreciation and amortization from discontinued operations			(130,000)
Income from real estate operations			89,000
Gain on sales of real estate investments			798,000
INCOME FROM DISCONTINUED OPERATIONS			$ 887,000