Restatement and Revision of Previously Issued Consolidated Financial Statements - Cash Flows (Details) - USD ($) $ in Thousands		3 Months Ended				12 Months Ended
		Mar. 31, 2022		Mar. 31, 2021		Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss attributable to common stockholders	[1]	$ (5,131)		$ (7,419)
Adjustments to reconcile net loss attributable to common stockholders to net cash used in operating activities:
Depreciation and amortization and amortization of deferred finance costs	[1]	1,439		1,261
Stock-based compensation expense	[1]	123		133
Deferred rents receivable	[1]	(4)		(12)
Other non-cash adjustments - pension expense	[1]	119		119
Unrealized loss on warrants	[1]	369		1,977	[2]
Equity in net (income) loss from unconsolidated joint ventures	[1]	(746)		372	[2]
Distributions from unconsolidated joint ventures	[1]	168		194
Decrease (increase) in operating assets:
Residential condominium units for sale	[1]	3,548		(11,672)
Receivables	[1]	24		47
Prepaid expenses and other assets, net	[1]	(1,008)		(371)
Increase in operating liabilities:
Accounts payable and accrued expenses	[1]	1,474		1,294
Net cash used in operating activities	[1]	375		(14,077)
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to real estate	[1]	(64)		(53)
Net cash provided by (used in) investing activities	[1]	(64)		(53)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from loans and corporate credit facility	[1]	2,390		8,980
Proceeds from secured line of credit	[1]			1,200
Payment of finance costs	[1]			(21)
Repayment of loans	[1]	11,642
Settlement of stock awards	[1]	(291)		(370)
Net cash (used in) provided by financing activities	[1]	(9,543)		9,789
NET DECREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH		(9,232)	[1]	(4,341)	[1]	$ (9,232)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	[1]	24,845		16,069		16,069
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	[1]	15,613		11,728		24,845
CASH AND CASH EQUIVALENTS, BEGINNING PERIOD	[1]	4,310		6,515		6,515
RESTRICTED CASH, BEGINNING OF PERIOD	[1]	20,535		9,554		9,554
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	[1]	24,845		16,069		16,069
CASH AND CASH EQUIVALENTS, END OF PERIOD	[1]	1,381		5,034		4,310
RESTRICTED CASH, END OF PERIOD	[1]	14,232		6,694		20,535
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	[1]	15,613		11,728		24,845
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the period for: Interest	[1]	3,050		4,130
Cash paid during the period for: Taxes	[1]	66		46
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Capitalized amortization of deferred financing costs and warrants	[1]	583		692
Capitalized stock-based compensation expense	[1]	18		37
Previously Reported
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss attributable to common stockholders		(2,538)		(6,589)
Adjustments to reconcile net loss attributable to common stockholders to net cash used in operating activities:
Depreciation and amortization and amortization of deferred finance costs		1,405		908
Stock-based compensation expense		123		133
Deferred rents receivable		(4)		(12)
Other non-cash adjustments - pension expense		119		119
Unrealized loss on warrants		369		1,977
Equity in net (income) loss from unconsolidated joint ventures		(746)		372
Distributions from unconsolidated joint ventures		168		194
Decrease (increase) in operating assets:
Residential condominium units for sale		(5)
Receivables		24		47
Prepaid expenses and other assets, net		(1,008)		(371)
Increase in operating liabilities:
Accounts payable and accrued expenses		1,474		1,294
Net cash used in operating activities		(619)		(1,928)
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to real estate		(4,704)		(12,202)
Net proceeds from the sale of residential condominium units		5,634
Net cash provided by (used in) investing activities		930		(12,202)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from loans and corporate credit facility		2,390		8,980
Proceeds from secured line of credit				1,200
Payment of finance costs				(21)
Repayment of loans		11,642
Settlement of stock awards		(291)		(370)
Net cash (used in) provided by financing activities		(9,543)		9,789
NET DECREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH		(9,232)		(4,341)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD		24,845		16,069		16,069
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD		15,613		11,728		24,845
CASH AND CASH EQUIVALENTS, BEGINNING PERIOD		4,310		6,515		6,515
RESTRICTED CASH, BEGINNING OF PERIOD		20,535		9,554		9,554
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD		24,845		16,069		16,069
CASH AND CASH EQUIVALENTS, END OF PERIOD		1,381		5,034		4,310
RESTRICTED CASH, END OF PERIOD		14,232		6,694		20,535
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD		15,613		11,728		$ 24,845
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the period for: Interest		3,050		4,130
Cash paid during the period for: Taxes		66		46
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Accrued development costs included in accounts payable and accrued expenses		9,332		7,496
Capitalized amortization of deferred financing costs and warrants		617		760
Capitalized stock-based compensation expense		46		39
Error Related to Classification of Real Estate Under Development | Revision/Restatement Impact
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss attributable to common stockholders		(2,593)		(830)
Adjustments to reconcile net loss attributable to common stockholders to net cash used in operating activities:
Depreciation and amortization and amortization of deferred finance costs		34		353
Decrease (increase) in operating assets:
Residential condominium units for sale		3,553		(11,672)
Increase in operating liabilities:
Net cash used in operating activities		994		(12,149)
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to real estate		4,640		12,149
Net proceeds from the sale of residential condominium units		(5,634)
Net cash provided by (used in) investing activities		(994)		12,149
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Accrued development costs included in accounts payable and accrued expenses		(9,332)		(7,496)
Capitalized amortization of deferred financing costs and warrants		(34)		(68)
Capitalized stock-based compensation expense		$ (28)		$ (2)

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

[2] Amounts are Revised. See Note 3 for more information.