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Note 1 - Organization (Details Textual) $ / shares in Units, $ in Thousands		3 Months Ended
	Feb. 09, 2017 USD ($) $ / shares shares	Mar. 31, 2017 ft² shares	Aug. 03, 2015
Formation Transaction, Units Converted to Commons Shares, Ratio			1
Percentage of Aggregate Cash Distributions From, and Profits and Losses		40.40%
Tribeca House properties in Manhattan [Member]
Number of Buildings		2
Tribeca House properties in Manhattan [Member] | Residential Rental [Member]
Gross Leasable Area		480,000
Tribeca House properties in Manhattan [Member] | Rental Retail and Parking [Member]
Gross Leasable Area		77,236
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		216,073
250 Livingston Street in Brooklyn [Member] | Office and Residential Building [Member]
Number of Stories		12
Gross Leasable Area		294,378
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
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 | $	$ 78,855

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
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-Topic 210
-SubTopic 10
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