Note 2- Significant Accounting Policies (Details Textual) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Mar. 31, 2023 USD ($) $ / shares shares	Apr. 30, 2022 $ / shares shares	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) shares	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($) $ / shares shares	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)
Number of Operating Segments					2
Equity, Including Portion Attributable to Noncontrolling Interest	$ 26,390		$ 13,640	$ 43,983	$ 13,640	$ 43,983	$ 19,530	$ 37,179	$ 50,222	$ 56,734		$ 69,949
Retained Earnings (Accumulated Deficit)			(84,290)		(84,290)			(74,895)
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount			$ 10,400		$ 10,400			$ 10,200
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					4 years
Percent of Distributed Dividends Equal to Taxable REIT Income			90.00%		90.00%
Income Tax Expense (Benefit)					$ 0
Weighted Average Number of Shares Outstanding, Diluted, Adjustment (in shares) | shares					0	0
Class B LLC Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares					26,317
Abandoned Acquisition and Dean Street Property [Member]
Transaction Pursuit Costs, Total				(10)		$ 506
Multifamily [Member] | Flatbush Gardens, Brooklyn, NY [Member]
Transaction Pursuit Costs, Total			$ 0		$ 357
LTIP Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares) | shares			3,382,465		3,382,465			2,949,823
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares			$ 8.80		$ 8.80			$ 9.26
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares		$ 8.70
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		10 years
LTIP Units [Member] | The 2015 Omnibus Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized, Subject to Approval (in shares) | shares		1,300,000
LTIP Units [Member] | The 2015 Non-Employee Director Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized, Subject to Approval (in shares) | shares		500,000
LTIP Units [Member] | Share-Based Payment Arrangement, Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares		900,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Subject to Approval (in shares) | shares		270,000
LTIP Units [Member] | Share-Based Payment Arrangement, Nonemployee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares		275,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Subject to Approval (in shares) | shares		82,500
LTIP Units [Member] | Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares	274,911
LTIP Units [Member] | Employees [Member] | Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	1 year
LTIP Units [Member] | Employees [Member] | Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	2 years 6 months
LTIP Units [Member] | Non-employee Director [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares	157,731
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 5.62
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	1 year
Collectability of Lease Receivables [Member]
Loss Contingency, Loss in Period			$ 900	800	$ 3,300	2,300
Revenues			$ 200	$ 800	$ 1,300	5,000
Collectability of Lease Receivables [Member] | One Customer at Tribeca House [Member]
Revenues						$ 1,100
Cumulative Effect, Period of Adoption, Adjustment [Member]
Equity, Including Portion Attributable to Noncontrolling Interest												(6,046)
Retained Earnings (Accumulated Deficit)												$ 6,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-02 [Member]
Equity, Including Portion Attributable to Noncontrolling Interest											$ 6,000