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Note 1 - Organization (Details Textual) $ / shares in Units, $ in Millions				3 Months Ended
	Oct. 27, 2017 USD ($)	May 09, 2017 USD ($)	Feb. 09, 2017 USD ($) $ / shares shares	Jun. 30, 2019 ft² a 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%
Residential Rental [Member] | Residential Property At 10 West 65th Street [Member]
Number of Units	82
Business Combination, Consideration Transferred, Total | $	$ 79.0
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 | $		$ 87.5
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 | a				370,000
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				1,917
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 | $			$ 78.7

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