Restatement and Revision of Previously Issued Consolidated Financial Statements - Cash Flows (Details) - USD ($) $ 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
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss attributable to common stockholders		$ (5,131)			$ (7,419)	$ (5,354)	$ (13,853)	$ (17,461)	$ (20,805)	$ 4,333
Adjustments to reconcile net loss attributable to common stockholders to net cash provided by (used in) operating activities:
Depreciation and amortization and amortization of deferred finance costs		1,439			1,261	2,821	2,944	4,214	5,524	4,168
Stock-based compensation expense		123			133	271	265	399	530	806
Gain on sale of school condominium										(24,196)
Deferred rents receivable		(4)			(12)	(7)	(16)	(20)	(24)	(84)
Other non-cash adjustments - pension expense		119			119	237	238	356	816	1,015
Unrealized (gain) loss on warrants	$ (1,300)	369	$ (1,718)	$ (67)	1,977	(931)	1,910	192	(73)	(965)
Equity in net loss from unconsolidated joint ventures	(4,560)	(746)		264	372	(5,306)	636	636	555	1,571
Distributions from unconsolidated joint ventures		168			194	1,183	425	686	885	1,110
Loan forgiveness							(243)	(243)
(Increase) decrease in operating assets:
Residential condominium units for sale		3,548			(11,672)	5,676	(19,479)	(25,371)	(11,450)	(46,473)
Receivables		24			47	34	820	887	882	2,392
Prepaid expenses and other assets, net		(1,008)			(371)	(1,041)	(97)	(846)	(257)	190
Increase in operating liabilities:
Accounts payable and accrued expenses		1,474			1,294	2,787	3,559	5,775	3,467	1,285
Pension liabilities									(1,288)	(1,033)
Net cash provided by (used in) operating activities		375			(14,077)	370	(22,891)	(30,796)	(21,238)	(55,881)
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to real estate		(64)			(53)	(68)	(56)	(84)	(140)	(4,279)
Investments in unconsolidated joint ventures										(5,383)
Net cash provided by (used in) investing activities		(64)			(53)	17,350	(56)	(84)	(140)	(9,662)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from loans and corporate credit facility		2,390			8,980	4,666	74,486	82,318	249,984	86,361
Proceeds from secured line of credit					1,200		1,200	4,200	8,200	5,000
Payment of finance costs		(11,642)			(21)		(2,231)	(2,442)	(6,552)	(1,497)
Repayment of loans						(27,049)	(56,413)	(56,413)	(225,547)	(23,368)
Repayment of secured line of credit						(3,500)			(3,200)	(2,500)
Settlement of stock awards		(291)			(370)	(291)	(369)	(370)	(370)	(695)
Stock buy-back										(359)
Sale of common stock, net								167	7,639
Net cash (used in) provided by financing activities		(9,543)			9,789	(26,174)	16,673	27,460	30,154	62,942
NET DECREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH		(9,232)			(4,341)	(8,454)	(6,274)	(3,420)	8,776	(2,601)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	15,613	24,845	9,795	11,728	16,069	24,845	16,069	16,069	16,069	18,670
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	16,391	15,613	12,649	9,795	11,728	16,391	9,795	12,649	24,845	16,069
CASH AND CASH EQUIVALENTS, BEGINNING PERIOD	1,381	4,310	2,169	5,034	6,515	4,310	6,515	6,515	6,515	9,196
RESTRICTED CASH, BEGINNING OF PERIOD	14,232	20,535	7,626	6,694	9,554	20,535	9,554	9,554	9,554	9,474
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	15,613	24,845	9,795	11,728	16,069	24,845	16,069	16,069	16,069	18,670
CASH AND CASH EQUIVALENTS, END OF PERIOD	3,112	1,381	917	2,169	5,034	3,112	2,169	917	4,310	6,515
RESTRICTED CASH, END OF PERIOD	13,279	14,232	11,732	7,626	6,694	13,279	7,626	11,732	20,535	9,554
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	16,391	15,613	12,649	9,795	11,728	16,391	9,795	12,649	24,845	16,069
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the period for: Interest		3,050			4,130	4,970	8,564	13,329	16,042	15,495
Cash paid during the period for: Taxes		66			46	251	49	189	395	251
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Capitalized amortization of deferred financing costs and warrants		583			692	1,272	1,501	2,169	3,193	2,668
Capitalized stock-based compensation expense		18			37	27	70	97	122	299
Loan forgiveness									243
Investment in unconsolidated joint venture										5,193
As Previously Reported
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss attributable to common stockholders		(2,538)			(6,589)		(11,303)	(12,335)	(16,474)	6,494
Adjustments to reconcile net loss attributable to common stockholders to net cash provided by (used in) operating activities:
Depreciation and amortization and amortization of deferred finance costs		1,405			908		2,246	3,122	3,998	2,970
Stock-based compensation expense		123			133		265	399	530	806
Gain on sale of school condominium										(24,196)
Deferred rents receivable		(4)			(12)		(16)	(20)	(24)	(84)
Other non-cash adjustments - pension expense		119			119		238	356	816	1,015
Unrealized (gain) loss on warrants		369	(1,718)	(67)	1,977		1,910	192	(73)	(965)
Equity in net loss from unconsolidated joint ventures		(746)		264	372		636	636	555	1,571
Distributions from unconsolidated joint ventures		168			194		425	686	885	1,110
Loan forgiveness							(243)	(243)
(Increase) decrease in operating assets:
Residential condominium units for sale		(5)						(33)	(321)
Receivables		24			47		820	887	882	2,392
Prepaid expenses and other assets, net		(1,008)			(371)		(97)	(846)	(257)	190
Increase in operating liabilities:
Accounts payable and accrued expenses		1,474			1,294		3,559	5,775	3,467	(686)
Pension liabilities									(1,288)	(1,033)
Net cash provided by (used in) operating activities		(619)			(1,928)		(1,560)	(1,424)	(7,304)	(10,416)
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to real estate		(4,704)			(12,202)		(21,387)	(30,784)	(36,349)	(51,715)
Net proceeds from the sale of residential condominium units		5,634						1,328	22,275
Deferred real estate deposits of condominiums										1,971
Investments in unconsolidated joint ventures										(5,383)
Net cash provided by (used in) investing activities		930			(12,202)		(21,387)	(29,456)	(14,074)	(55,127)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from loans and corporate credit facility		2,390			8,980		74,486	82,318	249,984	86,361
Proceeds from secured line of credit					1,200		1,200	4,200	8,200	5,000
Payment of finance costs		(11,642)			(21)		(2,231)	(2,442)	(6,552)	(1,497)
Repayment of loans							(56,413)	(56,413)	(225,547)	(23,368)
Repayment of secured line of credit									(3,200)	(2,500)
Settlement of stock awards		(291)			(370)		(369)	(370)	(370)	(695)
Stock buy-back										(359)
Sale of common stock, net								167	7,639
Net cash (used in) provided by financing activities		(9,543)			9,789		16,673	27,460	30,154	62,942
NET DECREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH		(9,232)			(4,341)		(6,274)	(3,420)	8,776	(2,601)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	15,613	24,845	9,795	11,728	16,069	24,845	16,069	16,069	16,069	18,670
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD		15,613	12,649	9,795	11,728		9,795	12,649	24,845	16,069
CASH AND CASH EQUIVALENTS, BEGINNING PERIOD	1,381	4,310	2,169	5,034	6,515	4,310	6,515	6,515	6,515	9,196
RESTRICTED CASH, BEGINNING OF PERIOD	14,232	20,535	7,626	6,694	9,554	20,535	9,554	9,554	9,554	9,474
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	$ 15,613	24,845	9,795	11,728	16,069	$ 24,845	16,069	16,069	16,069	18,670
CASH AND CASH EQUIVALENTS, END OF PERIOD		1,381	917	2,169	5,034		2,169	917	4,310	6,515
RESTRICTED CASH, END OF PERIOD		14,232	11,732	7,626	6,694		7,626	11,732	20,535	9,554
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD		15,613	$ 12,649	$ 9,795	11,728		9,795	12,649	24,845	16,069
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the period for: Interest		3,050			4,130		8,564	13,329	16,042	15,495
Cash paid during the period for: Taxes		66			46		49	189	395	251
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Accrued development costs included in accounts payable and accrued expenses		9,332			7,496		8,321	7,101	8,805	10,319
Capitalized amortization of deferred financing costs and warrants		617			760		1,629	2,406	3,580	2,727
Capitalized stock-based compensation expense		46			39		85	130	177	356
Loan forgiveness									243
Investment in unconsolidated joint venture										5,193
Error Related to Classification of Real Estate Under Development | Restatement Impact
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss attributable to common stockholders		(2,593)			(830)		(2,550)	(5,126)	(4,331)	(2,161)
Adjustments to reconcile net loss attributable to common stockholders to net cash provided by (used in) operating activities:
Depreciation and amortization and amortization of deferred finance costs		34			353		698	1,092	1,526	1,198
(Increase) decrease in operating assets:
Residential condominium units for sale		3,553			(11,672)		(19,479)	(25,338)	(11,129)	(46,473)
Increase in operating liabilities:
Accounts payable and accrued expenses										1,971
Net cash provided by (used in) operating activities		994			(12,149)		(21,331)	(29,372)	(13,934)	(45,465)
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to real estate		4,640			12,149		21,331	30,700	36,209	47,436
Net proceeds from the sale of residential condominium units		(5,634)						(1,328)	(22,275)
Deferred real estate deposits of condominiums										(1,971)
Net cash provided by (used in) investing activities		(994)			12,149		21,331	29,372	13,934	45,465
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Accrued development costs included in accounts payable and accrued expenses		(9,332)			(7,496)		(8,321)	(7,101)	(8,805)	(10,319)
Capitalized amortization of deferred financing costs and warrants		(34)			(68)		(128)	(237)	(387)	(59)
Capitalized stock-based compensation expense		$ (28)			$ (2)		$ (15)	$ (33)	$ (55)	$ (57)