QUARTERLY FINANCIAL DATA (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
QUARTERLY FINANCIAL DATA (Unaudited)
Rental and other revenue from real estate properties	$ 7,029	$ 7,020	$ 6,657	$ 6,745	$ 6,765	$ 6,261	$ 7,097	$ 6,886	$ 27,451	$ 27,009
Other income	20	293	159	179	157	161	190	244	651	752
Total revenues	7,049	7,313	6,816	6,924	6,922	6,422	7,287	7,130	28,102	27,761
Real estate operating expenses	3,026	3,289	3,004	3,058	3,090	2,741	3,325	3,176	12,377	12,332
Interest expense	1,700	1,731	1,809	1,860	1,931	1,870	2,049	1,946	7,100	7,796
General and administrative	2,647	2,730	2,957	3,367	2,636	2,430	2,481	2,544	11,701	10,091
Impairment charge	0	3,642	0	0					3,642	0
Depreciation	1,595	1,777	1,809	1,561	1,568	1,373	1,428	1,547	6,742	5,916
Total expenses	8,968	13,169	9,579	9,846	9,225	8,414	9,283	9,213	41,562	36,135
Total revenues less total expenses	(1,919)	(5,856)	(2,763)	(2,922)	(2,303)	(1,992)	(1,996)	(2,083)	(13,460)	(8,374)
Equity in loss from unconsolidated joint ventures	(1,293)	(1,529)	(1,387)	(1,815)	(2,150)	(2,390)	(2,218)	(2,068)	(6,024)	(8,826)
Equity in earnings from sale of unconsolidated joint venture properties					9,932	0	0	0	0	9,932
Gain on sale of real estate					680	9,938	0	0	0	10,618
Loss on extinguishment of debt					0	(1,387)	0	0	0	(1,387)
(Loss) income from continuing operations	(3,212)	(7,385)	(4,150)	(4,737)	6,159	4,169	(4,214)	(4,151)	(19,484)	1,963
Provision for taxes	56	65	65	62	51	98	59	62	248	270
(Loss) income from continuing operations, net of taxes	(3,268)	(7,450)	(4,215)	(4,799)	6,108	4,071	(4,273)	(4,213)	(19,732)	1,693
(Income) attributable to non-controlling interests	(33)	(34)	(31)	(32)	40	(799)	(44)	(34)	(130)	(837)
Net (loss) income attributable to common stockholders	$ (3,301)	$ (7,484)	$ (4,246)	$ (4,831)	$ 6,148	$ 3,272	$ (4,317)	$ (4,247)	$ (19,862)	$ 856
Basic per share amounts attributable to common stockholders
Basic earnings (loss) per share (in dollars per share)	$ (0.19)	$ (0.44)	$ (0.25)	$ (0.29)	$ 0.38	$ 0.21	$ (0.27)	$ (0.27)	$ (1.16)	$ 0.05
Diluted earnings (loss) per share (in dollars per share)	$ (0.19)	$ (0.44)	$ (0.25)	$ (0.29)	$ 0.38	$ 0.20	$ (0.27)	$ (0.27)	$ (1.16)	$ 0.05