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RECENT REAL ESTATE TRANSACTIONS (Disposals of Properties) (Details)				3 Months Ended
	Mar. 13, 2020 USD ($)	Feb. 05, 2020 USD ($)	Jan. 15, 2019 USD ($)	Mar. 31, 2020 USD ($) property	Mar. 31, 2019 USD ($) property	Dec. 31, 2019 USD ($)
Real Estate Properties [Line Items]
Mortgage notes issued for property acquired				$ 7,632,556		$ 12,238,692
Centennial Tech Center | Discontinued Operations, Disposed of by Sale
Real Estate Properties [Line Items]
Proceeds from sale of property		$ 15,000,000.0
Gain (loss) on sale of property		$ (913,000)
Union Terrace | Discontinued Operations, Disposed of by Sale
Real Estate Properties [Line Items]
Proceeds from sale of property	$ 11,300,000
Gain (loss) on sale of property	$ 688,000
Residential Properties | Model Home
Real Estate Properties [Line Items]
No. of Properties | property				10
Purchase price of property acquired				$ 3,600,000
Cash payment for the properties acquired				1,100,000
Mortgage notes issued for property acquired				2,500,000
Residential Properties | Model Home | Discontinued Operations, Disposed of by Sale
Real Estate Properties [Line Items]
Proceeds from sale of property				2,800,000	$ 5,800,000
Gain (loss) on sale of property				$ 215,000	$ 514,000
No. of Properties | property				8	15
Residential Properties | Morena Office Center | Discontinued Operations, Disposed of by Sale
Real Estate Properties [Line Items]
Proceeds from sale of property			$ 5,600,000
Gain (loss) on sale of property			$ 700,000

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