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Note 6 - Notes Payable (Details Textual) - USD ($) $ in Thousands				3 Months Ended		6 Months Ended		26 Months Ended	60 Months Ended	132 Months Ended
	May 31, 2019	Feb. 21, 2018	May 09, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Nov. 01, 2027	Jul. 31, 2028	Jun. 30, 2028	Dec. 31, 2018	Oct. 27, 2017	Jun. 27, 2016	May 11, 2016
Long-term Debt, Gross				$ 974,197		$ 974,197		$ 974,197				$ 925,613
Gain (Loss) on Extinguishment of Debt, Total				$ (1,771)		$ (1,771)	$ (6,981)
Secured First Mortgage Loan [Member] | New York Community Bank [Member]
Long-term Debt, Gross		$ 246,000
Debt Instrument, Interest Rate, Stated Percentage		3.50%
Debt Instrument, Interest Only Payments Period		2 years 180 days
Secured First Mortgage Loan [Member] | New York Community Bank [Member] | Prime Rate [Member]
Derivative, 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	90 days
Mortgages 2 [Member] | New York Community Bank [Member] | 141 Livingston Street, Brooklyn [Member]
Long-term Debt, Gross															$ 79,500
Debt Instrument, Interest Rate, Stated Percentage															3.875%
Mortgages 2 [Member] | New York Community Bank [Member] | 141 Livingston Street, Brooklyn [Member] | Forecast [Member]
Debt Instrument, Periodic Payment, Total											$ 374
Fixed Interest Rate Financing [Member]
Long-term Debt, Gross		$ 360,000
Debt Instrument, Interest Rate, Stated Percentage		4.506%
Mortgages [Member] | New York Community Bank [Member] | Property at 10 W 65th St. Manhattan, NY [Member]
Long-term Debt, Gross													$ 34,350
Debt Instrument, Interest Rate, Stated Percentage													3.375%
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%
Mortgages [Member] | Capital One Multifamily Finance LLC [Member] | Aspen [Member]
Long-term Debt, Gross														$ 70,000
Debt Instrument, Interest Rate, Stated Percentage														3.68%
Mortgages [Member] | Capital One Multifamily Finance LLC [Member] | Aspen [Member] | Forecast [Member]
Debt Instrument, Periodic Payment, Total										$ 321
Mortgages [Member] | Blackstone Real Estate Special Situations Advisors LLC [Member] | 107 Columbia Heights in Brooklyn, NY [Member]
Long-term Debt, Gross			$ 59,000
Mortgages [Member] | Blackstone Real Estate Special Situations Advisors LLC [Member] | London Interbank Offered Rate (LIBOR) [Member] | 107 Columbia Heights in Brooklyn, NY [Member]
Debt Instrument, Basis Spread on Variable Rate			3.85%
Debt Instrument, Interest Rate, Effective Percentage				6.20%		6.20%		6.20%
Construction Loans [Member] | Blackstone Real Estate Special Situations Advisors LLC [Member] | 107 Columbia Heights in Brooklyn, NY [Member]
Proceeds from Issuance of Long-term Debt, Total								$ 5,731
Debt Agreement Maximum Borrowing Capacity			$ 14,700

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