RESTATEMENT AND REVISION OF CONSOLIDATED FINANCIAL STATEMENTS - Income Statement (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Revenues
Rental revenues	$ 967	$ 577	$ 447	$ 1,024	$ 1,991	$ 3,225	$ 1,563	[1]	$ 4,631	[1]
Other income	30	256	46	302	332	355	263	[1]	0	[1]
Sale of residential condominium units	1,428				1,428	23,685	0	[1]	0	[1]
Total revenues	2,425	833	493	1,326	3,751	27,265	1,826	[1]	4,631	[1]
Operating Expenses
Property operating expenses	897	1,888		3,795	4,692	5,583	9,120	[1]	7,140	[1]
Real estate taxes	271	79	79	158	429	724	254	[1]	510	[1]
General and administrative	1,440	1,387	1,243	2,630	4,070	5,133	5,217	[1]	5,677	[1]
Pension related costs	158	162	163	325	483	67	345	[1]	733	[1]
Cost of sale - residential condominium units	1,395				1,395	22,370	0	[1]	0	[1]
Transaction related costs						0	133	[1]	167	[1]
Depreciation and amortization	1,001	1,000	1,000	2,000	3,001	4,003	3,907	[1]	4,118	[1]
Total operating expenses	5,162	4,516	4,392	8,908	14,070	37,880	18,976	[1]	18,345	[1]
Gain on sale of real estate									9,521
Gain on sale of school condominium						0	24,196	[1]	0	[1]
Operating (loss) income	(2,737)	(3,683)	(3,899)	(7,582)	(10,319)	(10,615)	7,046	[1]	(4,193)	[1]
Equity in net loss from unconsolidated joint ventures		(264)	(372)	(636)	(636)	(555)	(1,571)	[1]	(819)	[1]
Unrealized gain on warrants	1,718	67	(1,977)	(1,910)	(192)	73	965	[1]	0	[1]
Interest expense, net	(2,367)	(1,772)	(875)	(2,647)	(5,014)	(7,922)	(1,540)	[1]	(113)	[1]
Interest expense - amortization of deferred finance costs	(269)	(683)	(261)	(944)	(1,213)	(1,521)	(261)	[1]	(39)	[1]
(Loss) income before taxes	(3,655)	(6,335)	(7,384)	(13,719)	(17,374)	(20,540)	4,639	[1]	(5,164)	[1]
Tax expense	47	(99)	(35)	(134)	(87)	(265)	(306)	[1]	(128)	[1]
Net (loss) income attributable to common stockholders	(3,608)	(6,434)	(7,419)	(13,853)	(17,461)	(20,805)	4,333	[1]	(5,292)	[1]
Other comprehensive (loss) income:
Unrealized gain on pension liability	119	118	119	237	356	816	1,015	[1]	344	[1]
Comprehensive (loss) income attributable to common stockholders	$ (3,489)	$ (6,316)	$ (7,300)	$ (13,616)	$ (17,105)	$ (19,989)	$ 5,348	[1]	$ (4,948)	[1]
(Loss) income per share - basic	$ (0.11)	$ (0.20)	$ (0.23)	$ (0.42)	$ (0.53)	$ (0.62)	$ 0.13	[1]	$ (0.17)	[1]
(Loss) income per share - diluted	$ (0.11)	$ (0.20)	$ (0.23)	$ (0.42)	$ (0.53)	$ (0.62)	$ 0.13	[1]	$ (0.17)	[1]
Weighted average number of common shares - basic	32,756	32,694	32,591	32,643	32,681	33,322	32,305	[1]	31,915	[1]
Weighted average number of common shares - diluted	32,756	32,694	32,591	32,643	32,681	33,322	32,860	[1]	31,915	[1]
Error Related to Classification of Real Estate Under Development | As Previously Reported
Revenues
Rental revenues	$ 803	$ 425	$ 299	$ 724	$ 1,527	$ 2,600	$ 993		$ 4,062
Other income	30	256	46	302	332	355	263
Sale of residential condominium units	1,450				1,450	24,802
Total revenues	2,283	681	345	1,026	3,309	27,757	1,256		4,062
Operating Expenses
Property operating expenses	705	1,463		3,118	3,823	7,414	8,166		5,328
Real estate taxes	17	20	20	40	57	74	79		328
General and administrative	1,217	1,235	1,203	2,438	3,655	4,492	4,955		5,349
Pension related costs	158	162	163	325	483	67	345		733
Cost of sale - residential condominium units	1,417				1,417	24,432
Transaction related costs							133		167
Depreciation and amortization	716	715	715	1,430	2,146	2,864	2,768		2,977
Total operating expenses	4,230	3,595	3,756	7,351	11,581	39,343	16,446		14,882
Gain on sale of real estate									9,521
Gain on sale of school condominium							24,196
Operating (loss) income	(1,947)	(2,914)	(3,411)	(6,325)	(8,272)	(11,586)	9,006		(1,299)
Equity in net loss from unconsolidated joint ventures		(264)	(372)	(636)	(636)	(555)	(1,571)		(819)
Unrealized gain on warrants	1,718	67	(1,977)	(1,910)	(192)	73	965
Interest expense, net	(690)	(881)	(601)	(1,482)	(2,172)	(3,007)	(1,398)		67
Interest expense - amortization of deferred finance costs	(160)	(623)	(193)	(816)	(976)	(1,134)	(202)
(Loss) income before taxes	(1,079)	(4,615)	(6,554)	(11,169)	(12,248)	(16,209)	6,800		(2,051)
Tax expense	47	(99)	(35)	(134)	(87)	(265)	(306)		(128)
Net (loss) income attributable to common stockholders	(1,032)	(4,714)	(6,589)	(11,303)	(12,335)	(16,474)	6,494		(2,179)
Other comprehensive (loss) income:
Unrealized gain on pension liability	119	118	119	237	356	816	1,015		344
Comprehensive (loss) income attributable to common stockholders	$ (913)	$ (4,596)	$ (6,470)	$ (11,066)	$ (11,979)	$ (15,658)	$ 7,509		$ (1,835)
(Loss) income per share - basic	$ (0.03)	$ (0.14)	$ (0.20)	$ (0.35)	$ (0.38)	$ (0.49)	$ 0.20		$ (0.07)
(Loss) income per share - diluted	$ (0.03)	$ (0.14)	$ (0.20)	$ (0.35)	$ (0.38)	$ (0.49)	$ 0.20		$ (0.07)
Weighted average number of common shares - basic	32,756	32,694	32,591	32,643	32,681	33,322	32,305		31,915
Weighted average number of common shares - diluted	32,756	32,694	32,591	32,643	32,681	33,322	32,860		31,915
Error Related to Classification of Real Estate Under Development | Revision/Restatement Impact
Revenues
Rental revenues	$ 164	$ 152	$ 148	$ 300	$ 464	$ 625	$ 570		$ 569
Sale of residential condominium units	(22)				(22)	(1,117)
Total revenues	142	152	148	300	442	(492)	570		569
Operating Expenses
Property operating expenses	192	425		677	869	(1,831)	954		1,812
Real estate taxes	254	59	59	118	372	650	175		182
General and administrative	223	152	40	192	415	641	262		328
Cost of sale - residential condominium units	(22)				(22)	(2,062)
Depreciation and amortization	285	285	285	570	855	1,139	1,139		1,141
Total operating expenses	932	921	636	1,557	2,489	(1,463)	2,530		3,463
Operating (loss) income	(790)	(769)	(488)	(1,257)	(2,047)	971	(1,960)		(2,894)
Interest expense, net	(1,677)	(891)	(274)	(1,165)	(2,842)	(4,915)	(142)		(180)
Interest expense - amortization of deferred finance costs	(109)	(60)	(68)	(128)	(237)	(387)	(59)		(39)
(Loss) income before taxes	(2,576)	(1,720)	(830)	(2,550)	(5,126)	(4,331)	(2,161)		(3,113)
Net (loss) income attributable to common stockholders	(2,576)	(1,720)	(830)	(2,550)	(5,126)	(4,331)	(2,161)		(3,113)
Other comprehensive (loss) income:
Comprehensive (loss) income attributable to common stockholders	$ (2,576)	$ (1,720)	$ (830)	$ (2,550)	$ (5,126)	$ (4,331)	$ (2,161)		$ (3,113)
(Loss) income per share - basic	$ (0.08)	$ (0.05)	$ (0.03)	$ (0.08)	$ (0.16)	$ (0.13)	$ (0.07)		$ (0.10)
(Loss) income per share - diluted	$ (0.08)	$ (0.05)	$ (0.03)	$ (0.08)	$ (0.16)	$ (0.13)	$ (0.07)		$ (0.10)
Weighted average number of common shares - basic	32,756	32,694	32,591	32,643	32,681	33,322	32,305		31,915
Weighted average number of common shares - diluted	32,756	32,694	32,591	32,643	32,681	33,322	32,860		31,915

[1] Amounts are revised. See Note 3 for more information.