REAL ESTATE (Revenue and Expenses for Real Estate Held-for-Sale) (Details) - Disposed of by Sale - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Rental income	$ 1,315	$ 1,534	$ 1,206
Other operating income	32	27	35
Total revenues	1,347	1,561	1,241
Operating Expenses [Abstract]
Operating, maintenance, and management	313	261	312
Real estate taxes and insurance	69	78	76
Asset management fees to affiliate	97	133	127
Depreciation and amortization	562	671	608
Interest expense	352	363	343
Total expenses	$ 1,393	$ 1,506	$ 1,466