Note 4 - Notes Payable - Mortgages and Mezzanine Note Payable (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Debt, gross	$ 1,285,799
Total debt	1,285,799
Unamortized debt issuance costs	(7,843)	$ (8,712)
Mortgages and Mezzanine Notes [Member]
Debt, gross	1,285,799	1,286,233
Total debt	1,285,799	1,286,233
Unamortized debt issuance costs	(7,843)	(8,712)
Total debt, net of unamortized debt issuance costs	$ 1,277,956	1,277,521
Flatbush Gardens, Brooklyn, NY [Member] \| Mortgages and Mezzanine Notes 1[Member]
Maturity	Jun. 01, 2032
Interest rate	3.125%
Debt, gross	$ 329,000	329,000
Maturity	Jun. 01, 2032
Interest rate	3.125%
Total debt	$ 329,000	329,000
250 Livingston Street in Brooklyn [Member] \| Mortgages and Mezzanine Notes 1[Member]
Maturity	Jun. 06, 2029
Interest rate	3.63%
Debt, gross	$ 125,000	125,000
Maturity	Jun. 06, 2029
Interest rate	3.63%
Total debt	$ 125,000	125,000
141 Livingston Street, Brooklyn [Member] \| Mortgages and Mezzanine Notes 1[Member]
Maturity	Mar. 06, 2031
Interest rate	3.21%
Debt, gross	$ 100,000	100,000
Maturity	Mar. 06, 2031
Interest rate	3.21%
Total debt	$ 100,000	100,000
Tribeca House Properties [Member] \| Mortgages and Mezzanine Notes 1[Member]
Maturity	Mar. 06, 2028
Interest rate	4.506%
Debt, gross	$ 360,000	360,000
Maturity	Mar. 06, 2028
Interest rate	4.506%
Total debt	$ 360,000	360,000
Aspen [Member] \| Mortgages and Mezzanine Notes 1[Member]
Maturity	Jul. 01, 2028
Interest rate	3.68%
Debt, gross	$ 57,299	57,733
Maturity	Jul. 01, 2028
Interest rate	3.68%
Total debt	$ 57,299	57,733
Clover House [Member] \| Mortgages and Mezzanine Notes 1[Member]
Maturity	Dec. 01, 2029
Interest rate	3.53%
Debt, gross	$ 82,000	82,000
Maturity	Dec. 01, 2029
Interest rate	3.53%
Total debt	$ 82,000	82,000
Residential Property At 1010 Pacific Street [Member] \| Mortgages and Mezzanine Notes 3[Member]
Maturity	Sep. 30, 2030
Interest rate	5.73%
Debt, gross	$ 84,500	84,500
Maturity	Sep. 30, 2030
Interest rate	5.73%
Total debt	$ 84,500	84,500
Dean Street, Prospect Heights [Member] \| Mortgages and Mezzanine Notes 3[Member]
Maturity	May 09, 2027
Interest rate	2.65%
Debt, gross	$ 115,000	115,000
Maturity	May 09, 2027
Interest rate	2.65%
Total debt	$ 115,000	115,000
Dean Street, Prospect Heights [Member] \| Mortgages and Mezzanine Notes 4 [Member]
Maturity	May 09, 2027
Interest rate	2.65%
Debt, gross	$ 33,000	33,000
Maturity	May 09, 2027
Interest rate	2.65%
Total debt	$ 33,000	$ 33,000

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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