Restatement and Revision of Previously Issued Consolidated Financial Statements - Balance Sheet (Details) - USD ($)	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
ASSETS
Real estate, net	$ 66,016,000	$ 66,705,000	$ 67,334,000	$ 67,996,000	$ 68,663,000	$ 69,353,000		$ 70,040,000
Residential condominium units for sale	214,759,000	214,591,000	216,983,000	228,102,000	222,713,000	213,223,000		203,276,000
Cash and cash equivalents	3,112,000	1,381,000	4,310,000	917,000	2,169,000	5,034,000		6,515,000		$ 9,196,000
Restricted cash	13,279,000	14,232,000	20,535,000	11,732,000	7,626,000	6,694,000		9,554,000		9,474,000
Prepaid expenses and other assets, net	4,915,000	5,007,000	4,126,000	3,555,000	2,934,000	3,343,000		2,703,000
Investments in unconsolidated joint ventures	4,643,000	18,517,000	17,938,000	18,056,000	18,318,000	18,814,000		19,379,000
Receivables	50,000	60,000	84,000	79,000	146,000	919,000		966,000
Deferred rents receivable	121,000	118,000	114,000	110,000	106,000	102,000		90,000
Right-of-use asset	1,132,000	1,224,000	1,314,000	1,374,000	1,389,000	1,478,000		1,565,000
Intangible assets, net	8,062,000	8,247,000	8,432,000	8,617,000	8,802,000	8,987,000		9,172,000
Total assets	316,089,000	330,082,000	341,170,000	340,538,000	332,866,000	327,947,000		323,260,000
LIABILITIES
Loans payable, net	198,458,000	210,768,000	219,249,000	223,503,000	215,193,000	207,317,000		197,330,000
Corporate credit facility, net	33,337,000	33,090,000	32,844,000	32,597,000	32,351,000	32,104,000		31,858,000
Secured line of credit, net	9,250,000	12,750,000	12,750,000	11,950,000	8,950,000	8,950,000		7,747,000
Note payable	5,863,000	5,863,000	5,863,000	5,863,000	5,863,000	5,863,000		5,863,000
Accounts payable and accrued expenses	22,824,000	19,876,000	17,864,000	18,457,000	17,458,000	14,368,000		15,896,000
Lease liability	1,245,000	1,347,000	1,447,000	1,516,000	1,536,000	1,626,000		1,716,000
Warrant liability	215,000	1,515,000	1,146,000	1,411,000	3,129,000	3,196,000		830,000
Total liabilities	271,192,000	285,209,000	291,163,000	295,297,000	284,480,000	273,424,000		261,240,000
Commitments and Contingencies
STOCKHOLDERS' EQUITY
Special stock
Common stock	434,000	434,000	430,000	390,000	389,000	388,000		383,000
Additional paid-in capital	144,580,000	144,451,000	144,282,000	136,672,000	136,329,000	136,151,000		135,978,000
Treasury stock	(57,461,000)	(57,461,000)	(57,166,000)	(57,166,000)	(57,166,000)	(57,166,000)		(56,791,000)
Accumulated other comprehensive loss	(1,106,000)	(1,224,000)	(1,343,000)	(1,803,000)	(1,922,000)	(2,040,000)		(2,159,000)
Accumulated deficit	(41,550,000)	(41,327,000)	(36,196,000)	(32,852,000)	(29,244,000)	(22,810,000)		(15,391,000)
Total stockholders' equity	44,897,000	44,873,000	50,007,000	45,241,000	48,386,000	54,523,000	[1]	62,020,000	[1]	55,964,000
Total liabilities and stockholders' equity	316,089,000	330,082,000	341,170,000	340,538,000	332,866,000	327,947,000		323,260,000
Blank Check Preferred Stock
STOCKHOLDERS' EQUITY
Preferred stock, value
Preferred Stock
STOCKHOLDERS' EQUITY
Preferred stock, value
As Previously Reported
ASSETS
Real estate, net		294,108,000	294,536,000	307,112,000	299,814,000	289,294,000		279,204,000
Cash and cash equivalents		1,381,000	4,310,000	917,000	2,169,000	5,034,000		6,515,000		9,196,000
Restricted cash		14,232,000	20,535,000	11,732,000	7,626,000	6,694,000		9,554,000		9,474,000
Prepaid expenses and other assets, net		5,007,000	4,126,000	3,555,000	2,934,000	3,343,000		2,703,000
Investments in unconsolidated joint ventures		18,517,000	17,938,000	18,056,000	18,318,000	18,814,000		19,379,000
Receivables		60,000	84,000	79,000	146,000	919,000		966,000
Deferred rents receivable		118,000	114,000	110,000	106,000	102,000		90,000
Right-of-use asset		1,224,000	1,314,000	1,374,000	1,389,000	1,478,000		1,565,000
Intangible assets, net		8,247,000	8,432,000	8,617,000	8,802,000	8,987,000		9,172,000
Total assets		342,894,000	351,389,000	351,552,000	341,304,000	334,665,000		329,148,000
LIABILITIES
Loans payable, net		210,768,000	219,249,000	223,503,000	215,193,000	207,317,000		197,330,000
Corporate credit facility, net		33,090,000	32,844,000	32,597,000	32,351,000	32,104,000		31,858,000
Secured line of credit, net		12,750,000	12,750,000	11,950,000	8,950,000	8,950,000		7,747,000
Note payable		5,863,000	5,863,000	5,863,000	5,863,000	5,863,000		5,863,000
Accounts payable and accrued expenses		19,876,000	17,864,000	18,457,000	17,458,000	14,368,000		15,896,000
Lease liability		1,347,000	1,447,000	1,516,000	1,536,000	1,626,000		1,716,000
Warrant liability		1,515,000	1,146,000	1,411,000	3,129,000	3,196,000		830,000
Total liabilities		285,209,000	291,163,000	295,297,000	284,480,000	273,424,000		261,240,000
Commitments and Contingencies
STOCKHOLDERS' EQUITY
Special stock
Common stock		434,000	430,000	390,000	389,000	388,000		383,000
Additional paid-in capital		144,451,000	144,282,000	136,672,000	136,329,000	136,151,000		135,978,000
Treasury stock		(57,461,000)	(57,166,000)	(57,166,000)	(57,166,000)	(57,166,000)		(56,791,000)
Accumulated other comprehensive loss		(1,224,000)	(1,343,000)	(1,803,000)	(1,922,000)	(2,040,000)		(2,159,000)
Accumulated deficit		(28,515,000)	(25,977,000)	(21,838,000)	(20,806,000)	(16,092,000)		(9,503,000)
Total stockholders' equity		57,685,000	60,226,000	56,255,000	56,824,000	61,241,000		67,908,000		59,691,000
Total liabilities and stockholders' equity		342,894,000	351,389,000	351,552,000	341,304,000	334,665,000		329,148,000
As Previously Reported | Blank Check Preferred Stock
STOCKHOLDERS' EQUITY
Preferred stock, value
As Previously Reported | Preferred Stock
STOCKHOLDERS' EQUITY
Preferred stock, value
Error Related to Classification of Real Estate Under Development | Restatement Impact
ASSETS
Real estate, net		(227,403,000)	(227,202,000)	(239,116,000)	(231,151,000)	(219,941,000)		(209,164,000)
Residential condominium units for sale		214,591,000	216,983,000	228,102,000	222,713,000	213,223,000		203,276,000
Total assets		(12,812,000)	(10,219,000)	(11,014,000)	(8,438,000)	(6,718,000)		(5,888,000)
LIABILITIES
Commitments and Contingencies
STOCKHOLDERS' EQUITY
Special stock
Accumulated deficit		(12,812,000)	(10,219,000)	(11,014,000)	(8,438,000)	(6,718,000)		(5,888,000)
Total stockholders' equity		(12,812,000)	(10,219,000)	(11,014,000)	(8,438,000)	(6,718,000)		(5,888,000)		$ (3,727,000)
Total liabilities and stockholders' equity		(12,812,000)	(10,219,000)	(11,014,000)	(8,438,000)	(6,718,000)		(5,888,000)
Error Related to Classification of Real Estate Under Development | Restatement Impact | Blank Check Preferred Stock
STOCKHOLDERS' EQUITY
Preferred stock, value
Error Related to Classification of Real Estate Under Development | Restatement Impact | Preferred Stock
STOCKHOLDERS' EQUITY
Preferred stock, value

[1] (b) Amounts are Revised. See Note 14 for more information