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Note 5 - Notes Payable - Mortgages and Mezzanine Note Payable (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Flatbush Gardens, Brooklyn, NY (a)	$ 1,187,267	$ 1,171,238
Unamortized debt issuance costs	(9,240)	(9,650)
Total debt, net of unamortized debt issuance costs	$ 1,178,027	1,161,588
Mortgages and Mezzanine Notes 1[Member] | Flatbush Gardens, Brooklyn, NY [Member]
Flatbush Gardens, Brooklyn, NY (a)	3.125%
Flatbush Gardens, Brooklyn, NY (a)		329,000
1010 Pacific Street, Brooklyn, NY (h)	3.125%
Mortgages and Mezzanine Notes 1[Member] | 250 Livingston Street in Brooklyn [Member]
Flatbush Gardens, Brooklyn, NY (a)	3.63%
Flatbush Gardens, Brooklyn, NY (a)	$ 125,000	125,000
1010 Pacific Street, Brooklyn, NY (h)	3.63%
Mortgages and Mezzanine Notes 1[Member] | 141 Livingston Street, Brooklyn [Member]
Flatbush Gardens, Brooklyn, NY (a)		100,000
Mortgages and Mezzanine Notes 1[Member] | Tribeca House Properties [Member]
Flatbush Gardens, Brooklyn, NY (a)	4.506%
Flatbush Gardens, Brooklyn, NY (a)	$ 360,000	360,000
1010 Pacific Street, Brooklyn, NY (h)	4.506%
Mortgages and Mezzanine Notes 1[Member] | Aspen [Member]
Flatbush Gardens, Brooklyn, NY (a)	3.68%
Flatbush Gardens, Brooklyn, NY (a)	$ 62,164	62,554
1010 Pacific Street, Brooklyn, NY (h)	3.68%
Mortgages and Mezzanine Notes 1[Member] | Clover House [Member]
Flatbush Gardens, Brooklyn, NY (a)	3.53%
Flatbush Gardens, Brooklyn, NY (a)	$ 82,000	82,000
1010 Pacific Street, Brooklyn, NY (h)	3.53%
Mortgages and Mezzanine Notes 1[Member] | Property at 10 W 65th St. Manhattan, NY [Member]
Flatbush Gardens, Brooklyn, NY (a)	$ 32,118	32,222
Mortgages and Mezzanine Notes 1[Member] | Property at 10 W 65th St. Manhattan, NY [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
10 West 65th Street, Manhattan, NY (g)	2.50%
Mortgages and Mezzanine Notes 1[Member] | Residential Property At 1010 Pacific Street [Member]
Flatbush Gardens, Brooklyn, NY (a)		43,477
10 West 65th Street, Manhattan, NY (g)	3.60%
Mortgages and Mezzanine Notes 1[Member] | Dean Street, Prospect Heights [Member]
Flatbush Gardens, Brooklyn, NY (a)	$ 36,985	36,985
Mortgages and Mezzanine Notes 1[Member] | Dean Street, Prospect Heights [Member] | Prime Rate [Member]
10 West 65th Street, Manhattan, NY (g)	1.60%
Mortgages and Mezzanine Notes [Member]
Unamortized debt issuance costs	$ (9,240)	$ (9,650)
Mortgages and Mezzanine Notes [Member] | Flatbush Gardens in Brooklyn [Member]
Flatbush Gardens, Brooklyn, NY (a)	$ 329,000
Mortgages and Mezzanine Notes 2 [Member] | 141 Livingston Street in Brooklyn [Member]
Flatbush Gardens, Brooklyn, NY (a)	3.21%
1010 Pacific Street, Brooklyn, NY (h)	3.21%
Mortgages and Mezzanine Notes 2 [Member] | Residential Property At 1010 Pacific Street [Member]
Flatbush Gardens, Brooklyn, NY (a)	5.70%
Flatbush Gardens, Brooklyn, NY (a)	$ 60,000
1010 Pacific Street, Brooklyn, NY (h)	5.70%

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