Note 7 - Notes Payable (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Long-term Debt Instruments [Table Text Block]

Property	Maturity	Interest Rate		December 31, 2018			December 31, 2017
Flatbush Gardens, Brooklyn, NY (a)	10/1/2024		3.88%		—		$	148,438
Flatbush Gardens, Brooklyn, NY (a)	10/1/2024		3.88%		—			19,792
Flatbush Gardens, Brooklyn, NY (a)	3/1/2028		3.50%	$	246,000			—
250 Livingston Street, Brooklyn, NY (b)	5/6/2023		4.00%		—			34,294
250 Livingston Street, Brooklyn, NY (b)	12/9/2020	LIBOR + 2.15%			75,000			—
141 Livingston Street, Brooklyn, NY (c)	6/1/2028		3.875%		77,333			78,792
Tribeca House, Manhattan, NY (d)	11/9/2018	LIBOR + 3.75%			—			410,000
Tribeca House, Manhattan, NY (d)	3/6/2028		4.506%		360,000			—
Aspen, Manhattan, NY (e)	7/1/2028		3.68%		68,199			69,383
107 Columbia Heights, Brooklyn, NY (f)	5/9/2020	LIBOR + 3.85%			64,731			60,067
10 West 65 th Street, Manhattan, NY (g)	11/1/2027		3.375%		34,350			34,350
Total debt				$	925,613		$	855,116
Unamortized debt issuance costs					(12,049	)		(11,170	)
Total debt, net of unamortized debt issuance costs				$	913,564		$	843,946

Schedule of Maturities of Long-term Debt [Table Text Block]

2019	$	2,962
2020		144,919
2021		8,553
2022		8,866
2023		9,191
Thereafter		751,122
Total	$	925,613