Restatement and 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
	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Revenues
Rental revenues	$ 1,231	$ 1,260	$ 967	$ 577	$ 447	$ 2,491	$ 1,024	$ 1,991	$ 3,225	$ 1,563
Other income	10	16	30	256	46	26	302	332	355	263
Sale of residential condominium units	5,118	6,069	1,428			11,187		1,428	23,685
Total revenues	6,359	7,345	2,425	833	493	13,704	1,326	3,751	27,265	1,826
Operating Expenses
Property operating expenses	766	804	897	1,888	1,907	1,570	3,795	4,692	5,583	9,120
Real estate taxes	416	390	271	79	79	806	158	429	724	254
General and administrative	1,503	1,502	1,440	1,387	1,243	3,005	2,630	4,070	5,133	5,217
Pension related costs	157	158	158	162	163	315	325	483	67	345
Cost of sale - residential condominium units	4,803	5,721	1,395			10,524		1,395	22,370
Transaction related costs										133
Depreciation and amortization	1,004	1,003	1,001	1,000	1,000	2,007	2,000	3,001	4,003	3,907
Total operating expenses	8,649	9,578	5,162	4,516	4,392	18,227	8,908	14,070	37,880	18,976
Gain on sale of school condominium										24,196
Operating loss	(2,290)	(2,233)	(2,737)	(3,683)	(3,899)	(4,523)	(7,582)	(10,319)	(10,615)	7,046
Equity in net income (loss) from unconsolidated joint ventures	4,560	746		(264)	(372)	5,306	(636)	(636)	(555)	(1,571)
Unrealized gain (loss) on warrants	1,300	(369)	1,718	67	(1,977)	931	(1,910)	(192)	73	965
Interest expense, net	(3,295)	(2,769)	(2,367)	(1,772)	(875)	(6,064)	(2,647)	(5,014)	(7,922)	(1,540)
Interest income (expense) - amortization of deferred finance costs	(378)	(436)	(269)	(683)	(261)	(814)	(944)	(1,213)	(1,521)	(261)
Loss before taxes	(103)	(5,061)	(3,655)	(6,335)	(7,384)	(5,164)	(13,719)	(17,374)	(20,540)	4,639
Tax expense	(120)	(70)	47	(99)	(35)	(190)	(134)	(87)	(265)	(306)
Net loss attributable to common stockholders	(223)	(5,131)	(3,608)	(6,434)	(7,419)	(5,354)	(13,853)	(17,461)	(20,805)	4,333
Other comprehensive loss:
Unrealized gain on pension liability	118	119	119	118	119	237	237	356	816	1,015
Comprehensive loss attributable to common stockholders	$ (105)	$ (5,012)	$ (3,489)	$ (6,316)	$ (7,300)	$ (5,117)	$ (13,616)	$ (17,105)	$ (19,989)	$ 5,348
Loss per share - basic	$ (0.01)	$ (0.14)	$ (0.11)	$ (0.20)	$ (0.23)	$ (0.14)	$ (0.42)	$ (0.53)	$ (0.62)	$ 0.13
Loss per share - diluted	$ (0.01)	$ (0.14)	$ (0.11)	$ (0.20)	$ (0.23)	$ (0.14)	$ (0.42)	$ (0.53)	$ (0.62)	$ 0.13
Weighted average number of common shares - basic	37,186	37,104	32,756	32,694	32,591	37,145	32,643	32,681	33,322	32,305
Weighted average number of common shares - diluted	37,186	37,104	32,756	32,694	32,591	37,145	32,643	32,681	33,322	32,860
As Previously Reported
Revenues
Rental revenues		$ 1,260	$ 803	$ 425	$ 299		$ 724	$ 1,527	$ 2,600	$ 993
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	2,283	681	345		1,026	3,309	27,757	1,256
Operating Expenses
Property operating expenses		548	705	1,463	1,655		3,118	3,823	7,414	8,166
Real estate taxes		74	17	20	20		40	57	74	79
General and administrative		1,139	1,217	1,235	1,203		2,438	3,655	4,492	4,955
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	716	715	715		1,430	2,146	2,864	2,768
Total operating expenses		9,195	4,230	3,595	3,756		7,351	11,581	39,343	16,446
Gain on sale of school condominium										24,196
Operating loss		(1,641)	(1,947)	(2,914)	(3,411)		(6,325)	(8,272)	(11,586)	9,006
Equity in net income (loss) from unconsolidated joint ventures		746		(264)	(372)		(636)	(636)	(555)	(1,571)
Unrealized gain (loss) on warrants		(369)	1,718	67	(1,977)		(1,910)	(192)	73	965
Interest expense, net		(802)	(690)	(881)	(601)		(1,482)	(2,172)	(3,007)	(1,398)
Interest income (expense) - amortization of deferred finance costs		(402)	(160)	(623)	(193)		(816)	(976)	(1,134)	(202)
Loss before taxes		(2,468)	(1,079)	(4,615)	(6,554)		(11,169)	(12,248)	(16,209)	6,800
Tax expense		(70)	47	(99)	(35)		(134)	(87)	(265)	(306)
Net loss attributable to common stockholders		(2,538)	(1,032)	(4,714)	(6,589)		(11,303)	(12,335)	(16,474)	6,494
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)	$ (913)	$ (4,596)	$ (6,470)		$ (11,066)	$ (11,979)	$ (15,658)	$ 7,509
Loss per share - basic		$ (0.07)	$ (0.03)	$ (0.14)	$ (0.20)		$ (0.35)	$ (0.38)	$ (0.49)	$ 0.20
Loss per share - diluted		$ (0.07)	$ (0.03)	$ (0.14)	$ (0.20)		$ (0.35)	$ (0.38)	$ (0.49)	$ 0.20
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
Error Related to Classification of Real Estate Under Development | As Previously Reported
Other comprehensive loss:
Weighted average number of common shares - diluted		37,104
Error Related to Classification of Real Estate Under Development | Restatement Impact
Revenues
Rental revenues			$ 164	$ 152	$ 148		$ 300	$ 464	$ 625	$ 570
Sale of residential condominium units		$ (209)	(22)					(22)	(1,117)
Total revenues		(209)	142	152	148		300	442	(492)	570
Operating Expenses
Property operating expenses		256	192	425	252		677	869	(1,831)	954
Real estate taxes		316	254	59	59		118	372	650	175
General and administrative		363	223	152	40		192	415	641	262
Cost of sale - residential condominium units		(552)	(22)					(22)	(2,062)
Depreciation and amortization			285	285	285		570	855	1,139	1,139
Total operating expenses		383	932	921	636		1,557	2,489	(1,463)	2,530
Operating loss		(592)	(790)	(769)	(488)		(1,257)	(2,047)	971	(1,960)
Interest expense, net		(1,967)	(1,677)	(891)	(274)		(1,165)	(2,842)	(4,915)	(142)
Interest income (expense) - amortization of deferred finance costs		(34)	(109)	(60)	(68)		(128)	(237)	(387)	(59)
Loss before taxes		(2,593)	(2,576)	(1,720)	(830)		(2,550)	(5,126)	(4,331)	(2,161)
Net loss attributable to common stockholders		(2,593)	(2,576)	(1,720)	(830)		(2,550)	(5,126)	(4,331)	(2,161)
Other comprehensive loss:
Comprehensive loss attributable to common stockholders		$ (2,593)	$ (2,576)	$ (1,720)	$ (830)		$ (2,550)	$ (5,126)	$ (4,331)	$ (2,161)
Loss per share - basic		$ (0.07)	$ (0.08)	$ (0.05)	$ (0.03)		$ (0.08)	$ (0.16)	$ (0.13)	$ (0.07)
Loss per share - diluted		$ (0.07)	$ (0.08)	$ (0.05)	$ (0.03)		$ (0.08)	$ (0.16)	$ (0.13)	$ (0.07)
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