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Note 1 - Organization (Details Textual) $ / shares in Units, $ in Thousands				12 Months Ended
	Oct. 27, 2017 USD ($)	May 09, 2017 USD ($)	Feb. 09, 2017 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) ft² shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 shares	Aug. 03, 2015
Formation Transaction, Units Converted to Commons Shares, Ratio							1
Long-term Debt, Gross \| $				$ 925,613	$ 855,116
Percentage of Aggregate Cash Distributions From, and Profits and Losses				40.40%
Note Payable With New York Community Bank [Member]
Long-term Debt, Gross \| $	$ 34,400
Construction Loans [Member]
Long-term Debt, Gross \| $		$ 14,700
Residential Rental [Member] \| Residential Property At 10 West 65th Street [Member]
Number of Units	82
Business Combination, Consideration Transferred, Total \| $	$ 79,000
107 Columbia Heights in Brooklyn, NY [Member]
Number of Stories				11
107 Columbia Heights in Brooklyn, NY [Member] \| Apartment Building [Member]
Number of Units		161
Business Combination, Consideration Transferred, Total \| $		$ 87,500
Debt Instrument, Face Amount \| $		$ 59,000
Gross Leasable Area				102,000
Tribeca House properties in Manhattan [Member]
Number of Buildings				2
Tribeca House properties in Manhattan [Member] \| Residential Rental [Member]
Gross Leasable Area				483,000
Tribeca House properties in Manhattan [Member] \| Rental Retail and Parking [Member]
Gross Leasable Area				77,000
Tribeca House properties in Manhattan, Building One [Member]
Number of Stories				21
Tribeca House properties in Manhattan, Building Two [Member]
Number of Stories				12
Flatbush Gardens in Brooklyn [Member] \| Multifamily [Member]
Number of Buildings				59
Number of Rentable Units				2,496
141 Livingston Street in Brooklyn [Member] \| Office Building [Member]
Number of Stories				15
Gross Leasable Area				216,000
250 Livingston Street in Brooklyn [Member] \| Office and Residential Building [Member]
Number of Stories				12
Gross Leasable Area				381,000
Aspen [Member]
Number of Stories				7
Aspen [Member] \| Residential Rental [Member]
Gross Leasable Area				166,000
Aspen [Member] \| Retail Site [Member]
Gross Leasable Area				21,000
Property at 10 W 65th St. Manhattan, NY [Member] \| Residential Rental [Member]
Number of Stories				6
Gross Leasable Area				76,000
Common Stock [Member]
Stock Issued During Period, Shares, New Issues \| shares					6,390,149
IPO [Member] \| Common Stock [Member]
Stock Issued During Period, Shares, New Issues \| shares			6,390,149
Shares Issued, Price Per Share \| $ / shares			$ 13.50
Proceeds from Issuance Initial Public Offering \| $			$ 78,685