Revision of Previously Issued 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
	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Revenues
Rental revenues	$ 1,260	$ 967	$ 577	$ 447	$ 1,024	$ 1,991	$ 3,225	$ 1,563
Other income	16	30	256	46	302	332	355	263
Sale of residential condominium units	6,278	1,450				1,450	24,802
Total revenues	7,554	2,447	833	493	1,326	3,773	28,382	1,826
Operating Expenses
Property operating expenses	548	805	1,549	1,752	3,301	4,106	7,785	8,590
Real estate taxes	74	76	79	79	158	234	308	254
General and administrative	1,139	1,255	1,273	1,243	2,516	3,771	4,646	5,217
Pension related costs	158	158	162	163	325	483	67	345
Cost of sale - residential condominium units	6,273	1,417				1,417	24,432
Transaction related costs								133
Depreciation and amortization	1,003	1,001	1,000	1,000	2,000	3,001	4,003	3,907
Total operating expenses	9,195	4,712	4,063	4,237	8,300	13,012	41,241	18,446
Gain on sale of school condominium								24,196
Operating loss	(1,641)	(2,265)	(3,230)	(3,744)	(6,974)	(9,239)	(12,859)	7,576
Equity in net income (loss) from unconsolidated joint ventures	746		(264)	(372)	(636)	(636)	(555)	(1,571)
Unrealized loss on warrants	(369)	1,718	67	(1,977)	(1,910)	(192)	73	965
Interest expense, net	(802)	(692)	(883)	(603)	(1,486)	(2,178)	(3,012)	(1,540)
Interest expense - amortization of deferred finance costs	(402)	(160)	(623)	(193)	(816)	(976)	(1,134)	(261)
Loss before taxes	(2,468)	(1,399)	(4,933)	(6,889)	(11,822)	(13,221)	(17,487)	5,169
Tax expense	(70)	47	(99)	(35)	(134)	(87)	(265)	(306)
Net loss attributable to common stockholders	(2,538)	(1,352)	(5,032)	(6,924)	(11,956)	(13,308)	(17,752)	4,863
Other comprehensive loss:
Unrealized gain on pension liability	119	119	118	119	237	356	816	1,015
Comprehensive loss attributable to common stockholders	$ (2,419)	$ (1,233)	$ (4,914)	$ (6,805)	$ (11,719)	$ (12,952)	$ (16,936)	$ 5,878
Loss per share - basic	$ (0.07)	$ (0.04)	$ (0.15)	$ (0.21)	$ (0.37)	$ (0.41)	$ (0.53)	$ 0.15
Loss per share - diluted	$ (0.07)	$ (0.04)	$ (0.15)	$ (0.21)	$ (0.37)	$ (0.41)	$ (0.53)	$ 0.15
Weighted average number of common shares - basic	37,104	32,756	32,694	32,591	32,643	32,681	33,322	32,305
Weighted average number of common shares - diluted	37,104	32,756	32,694	32,591	32,643	32,681	33,322	32,860
Previously Reported
Revenues
Rental revenues		$ 803	$ 425	$ 299	$ 724	$ 1,527	$ 2,600	$ 993
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
Operating Expenses
Property operating expenses		705	1,463	1,655	3,118	3,823	7,414	8,166
Real estate taxes		17	20	20	40	57	74	79
General and administrative		1,217	1,235	1,203	2,438	3,655	4,492	4,955
Pension related costs		158	162	163	325	483	67	345
Cost of sale - residential condominium units		1,417				1,417	24,432
Transaction related costs								133
Depreciation and amortization		716	715	715	1,430	2,146	2,864	2,768
Total operating expenses		4,230	3,595	3,756	7,351	11,581	39,343	16,446
Gain on sale of school condominium								24,196
Operating loss		(1,947)	(2,914)	(3,411)	(6,325)	(8,272)	(11,586)	9,006
Equity in net income (loss) from unconsolidated joint ventures			(264)	(372)	(636)	(636)	(555)	(1,571)
Unrealized loss 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)
Interest expense - amortization of deferred finance costs		(160)	(623)	(193)	(816)	(976)	(1,134)	(202)
Loss before taxes		(1,079)	(4,615)	(6,554)	(11,169)	(12,248)	(16,209)	6,800
Tax expense		47	(99)	(35)	(134)	(87)	(265)	(306)
Net loss attributable to common stockholders		(1,032)	(4,714)	(6,589)	(11,303)	(12,335)	(16,474)	6,494
Other comprehensive loss:
Unrealized gain on pension liability		119	118	119	237	356	816	1,015
Comprehensive loss attributable to common stockholders		$ (913)	$ (4,596)	$ (6,470)	$ (11,066)	$ (11,979)	$ (15,658)	$ 7,509
Loss per share - basic		$ (0.03)	$ (0.14)	$ (0.20)	$ (0.35)	$ (0.38)	$ (0.49)	$ 0.20
Loss per share - diluted		$ (0.03)	$ (0.14)	$ (0.20)	$ (0.35)	$ (0.38)	$ (0.49)	$ 0.20
Weighted average number of common shares - basic		32,756	32,694	32,591	32,643	32,681	33,322	32,305
Weighted average number of common shares - diluted		32,756	32,694	32,591	32,643	32,681	33,322	32,860
Error Related to Classification of Real Estate Under Development | Restatement Impact
Revenues
Rental revenues		$ 164	$ 152	$ 148	$ 300	$ 464	$ 625	$ 570
Total revenues		164	152	148	300	464	625	570
Operating Expenses
Property operating expenses		100	86	97	183	283	371	424
Real estate taxes		59	59	59	118	177	234	175
General and administrative		38	38	40	78	116	154	262
Depreciation and amortization		285	285	285	570	855	1,139	1,139
Total operating expenses		482	468	481	949	1,431	1,898	2,000
Operating loss		(318)	(316)	(333)	(649)	(967)	(1,273)	(1,430)
Interest expense, net		(2)	(2)	(2)	(4)	(6)	(5)	(142)
Interest expense - amortization of deferred finance costs								(59)
Loss before taxes		(320)	(318)	(335)	(653)	(973)	(1,278)	(1,631)
Net loss attributable to common stockholders		(320)	(318)	(335)	(653)	(973)	(1,278)	(1,631)
Other comprehensive loss:
Comprehensive loss attributable to common stockholders		$ (320)	$ (318)	$ (335)	$ (653)	$ (973)	$ (1,278)	$ (1,631)
Loss per share - basic		$ (0.01)	$ (0.01)	$ (0.01)	$ (0.02)	$ (0.03)	$ (0.04)	$ (0.05)
Loss per share - diluted		$ (0.01)	$ (0.01)	$ (0.01)	$ (0.02)	$ (0.03)	$ (0.04)	$ (0.05)
Weighted average number of common shares - basic		32,756	32,694	32,591	32,643	32,681	33,322	32,305
Weighted average number of common shares - diluted		32,756	32,694	32,591	32,643	32,681	33,322	32,860