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Note 5 - Notes Payable (Details Textual) - USD ($) $ in Thousands							1 Months Ended	3 Months Ended		60 Months Ended	132 Months Ended
	Dec. 22, 2021	Aug. 10, 2021	Feb. 18, 2021	May 08, 2020	Dec. 24, 2019	May 31, 2019	Apr. 30, 2022	Mar. 31, 2022	Mar. 31, 2021	Nov. 01, 2027	Jul. 31, 2028	Dec. 31, 2021	Jun. 30, 2021	Nov. 08, 2019	Feb. 21, 2018	Oct. 27, 2017	Jun. 27, 2016
Long-term Debt, Gross								$ 1,151,115				$ 1,144,052
Gain (Loss) on Extinguishment of Debt, Total								$ 0	$ (3,034)
Metlife Real Estate Lending LLC [Member] | Clover House Loans [Member]
Long-term Debt, Gross														$ 82,000
Debt Instrument, Interest Rate, Effective Percentage														3.53%
Secured First Mortgage Loan [Member] | New York Community Bank [Member]
Debt Instrument, Face Amount				$ 329,000
Debt Instrument, Interest Rate, Stated Percentage				3.125%
Debt Instrument, Interest and Principal Payments Period (Year)				30 years
Secured First Mortgage Loan [Member] | New York Community Bank [Member] | Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate				2.75%
First Mortgage Loan With Interest-only Payments [Member] | Citi Real Estate Funding Inc. [Member]
Debt Instrument, Interest Rate, Stated Percentage						3.63%
Proceeds from Issuance of Long-term Debt, Total						$ 125,000
Debt Instrument, Prepayment Option, Number of Months Before Maturity (Month)						3 months
Mortgages 2 [Member] | New York Community Bank [Member] | 141 Livingston Street, Brooklyn [Member]
Long-term Debt, Gross			$ 79,500
Mortgages 2 [Member] | AIG Asset Management[Member] | Residential Property At 1010 Pacific Street [Member]
Debt Instrument, Interest Rate, Stated Percentage								4.10%
Proceeds from Issuance of Long-term Debt, Total								$ 7,617
Debt Instrument, Prepayment Option, Number of Months Before Maturity (Month)		5 months
Debt Instrument, Term (Year)		36 months
Mortgages 2 [Member] | AIG Asset Management[Member] | Residential Property At 1010 Pacific Street [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage		4.10%
Mortgages 2 [Member] | AIG Asset Management[Member] | London Interbank Offered Rate (LIBOR) [Member] | Residential Property At 1010 Pacific Street [Member]
Debt Instrument, Basis Spread on Variable Rate		3.60%
Debt Agreement Maximum Borrowing Capacity		$ 52,500
Secured First Mortgage Note [Member] | Citi Real Estate Funding Inc. [Member] | 141 Livingston Street, Brooklyn [Member]
Debt Instrument, Face Amount			$ 100,000
Debt Instrument, Interest Rate, Stated Percentage			3.21%
Debt Instrument, Prepayment Option, Number of Months Before Maturity (Month)			3 months
Debt Instrument, Term (Year)			10 years
Gain (Loss) on Extinguishment of Debt, Total									$ (3,034)
Fixed Interest Rate Financing [Member]
Debt Instrument, Interest Rate, Stated Percentage															4.506%
Long-term Debt, Gross															$ 360,000
Mortgages [Member] | New York Community Bank [Member] | Property at 10 W 65th St. Manhattan, NY [Member]
Debt Instrument, Interest Rate, Stated Percentage																3.375%
Long-term Debt, Gross																$ 34,350
Mortgages [Member] | New York Community Bank [Member] | Prime Rate [Member] | Property at 10 W 65th St. Manhattan, NY [Member] | Forecast [Member]
Debt Instrument, Basis Spread on Variable Rate										2.75%
Debt Instrument, Periodic Payment, Total										$ 152
Mortgages [Member] | Capital One Multifamily Finance LLC [Member] | Aspen [Member]
Debt Instrument, Interest Rate, Stated Percentage																	3.68%
Long-term Debt, Gross																	$ 70,000
Mortgages [Member] | Capital One Multifamily Finance LLC [Member] | Aspen [Member] | Forecast [Member]
Debt Instrument, Periodic Payment, Total											$ 321
Mortgages [Member] | Citibank NA [Member] | Residential Property At 1010 Pacific Street [Member]
Long-term Debt, Gross					$ 18,600
Debt Instrument, Interest Rate, Effective Percentage													4.85%
Mortgages [Member] | Citibank NA [Member] | Residential Property At 1010 Pacific Street [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Effective Percentage					1.25%
Mortgages [Member] | Citibank NA [Member] | London Interbank Offered Rate (LIBOR) [Member] | Residential Property At 1010 Pacific Street [Member]
Debt Instrument, Basis Spread on Variable Rate					3.60%
Mortgages [Member] | Bank Leumi, N.A [Member] | Dean Street, Prospect Heights [Member]
Long-term Debt, Gross	$ 30,000
Debt Instrument, Interest Rate, Effective Percentage								5.10%
Mortgages [Member] | Bank Leumi, N.A [Member] | Dean Street, Prospect Heights [Member] | Subsequent Event [Member]
Proceeds from Issuance of Debt							$ 6,985
Mortgages [Member] | Bank Leumi, N.A [Member] | Dean Street, Prospect Heights [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Effective Percentage	3.25%
Mortgages [Member] | Bank Leumi, N.A [Member] | Prime Rate [Member] | Dean Street, Prospect Heights [Member]
Debt Instrument, Basis Spread on Variable Rate	1.60%
Construction Loans [Member] | Citibank NA [Member] | Residential Property At 1010 Pacific Street [Member]
Debt Agreement Maximum Borrowing Capacity					$ 2,987

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