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Note 7 - Notes Payable (Details Textual) - USD ($) $ in Thousands				5 Months Ended	29 Months Ended	59 Months Ended	60 Months Ended	132 Months Ended
	Nov. 09, 2016	May 11, 2016	May 01, 2013	Mar. 31, 2017	Sep. 30, 2019	Sep. 30, 2019	Oct. 01, 2024	Jul. 31, 2028	Jun. 30, 2028	Jun. 27, 2016	Oct. 31, 2014	Sep. 24, 2012
Mortgages 1 [Member] | New York Community Bank [Member]
Long-term Debt, Gross												$ 150,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate												3.88%
Mortgages 1 [Member] | Citigroup Global Markets Realty Corp [Member]
Long-term Debt, Gross			$ 37,500
Debt Instrument, Periodic Payment			$ 179
Debt Instrument, Interest Rate, Stated Percentage			4.00%
Mortgages 1 [Member] | Citigroup Global Markets Inc. [Member] | 141 Livingston Street, Brooklyn [Member]
Repayments of Long-term Debt		$ 55,000
Mortgages 2 [Member] | New York Community Bank [Member]
Long-term Debt, Gross											$ 20,000
Mortgages 2 [Member] | New York Community Bank [Member] | 141 Livingston Street, Brooklyn [Member]
Debt Instrument, Interest Rate, Stated Percentage		3.875%
Proceeds from Issuance of Long-term Debt		$ 79,500
Mortgages 2 [Member] | New York Community Bank [Member] | Scenario, Forecast [Member]
Debt Instrument, Interest Rate During Period						3.88%
Debt Instrument, Periodic Payment					$ 94
Mortgages 2 [Member] | New York Community Bank [Member] | Scenario, Forecast [Member] | 141 Livingston Street, Brooklyn [Member]
Debt Instrument, Periodic Payment									$ 374
Mortgages 2 [Member] | New York Community Bank [Member] | Scenario, Forecast [Member] | Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate							2.75%
Mortgages [Member]
Repayments of Long-term Debt	$ 360,000
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] | Scenario, Forecast [Member] | Aspen [Member]
Debt Instrument, Periodic Payment								$ 321
Mezzanine Note Agreement [Member]
Repayments of Long-term Debt	100,000
Refinanced Loans [Member] | DB and SL Green Finance [Member] | Tribeca House Properties [Member]
Long-term Debt, Gross	$ 410,000
Refinanced Loans [Member] | DB and SL Green Finance [Member] | London Interbank Offered Rate (LIBOR) [Member] | Tribeca House Properties [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate				3.75%
Refinanced Loans [Member] | DB and SL Green Finance [Member] | London Interbank Offered Rate (LIBOR) [Member] | Tribeca House Properties [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate				4.73%

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