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Note 4 - Notes Payable (Details Textual)																1 Months Ended	2 Months Ended	3 Months Ended	6 Months Ended		132 Months Ended
	Oct. 06, 2025	Oct. 01, 2025 USD ($)	May 02, 2025 USD ($)	May 01, 2025 USD ($)	Feb. 23, 2024 USD ($)	Sep. 15, 2023 USD ($)	Aug. 10, 2023 USD ($)	Feb. 10, 2023	Feb. 09, 2023 USD ($)	Dec. 22, 2021 USD ($)	Aug. 10, 2021 USD ($)	Feb. 18, 2021 USD ($)	May 08, 2020 USD ($)	May 31, 2019 USD ($)	Jun. 27, 2016 USD ($)	Apr. 30, 2022 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2026 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jul. 31, 2028 USD ($)	Dec. 31, 2025 USD ($)	Dec. 30, 2025 USD ($)	Dec. 24, 2025 USD ($)	Dec. 18, 2025	Jul. 28, 2025 USD ($)	May 15, 2025 USD ($)	May 08, 2025 USD ($)	Apr. 30, 2025 USD ($)	Mar. 18, 2025 USD ($)	Oct. 28, 2024 USD ($)	Jun. 30, 2023	Nov. 08, 2019 USD ($)	Feb. 21, 2018 USD ($)
Debt, gross																			$ 1,287,226,000
Interest Paid, Excluding Capitalized Interest, Operating Activity																			23,213,000	$ 23,927,000
Interest Expense, Debt		$ 1,700,000
250 Livingston Street in Brooklyn [Member]
Rent Payments Per Annum					$ 15,400,000
141 Livingston Street, Brooklyn [Member]
Rent Payments Per Annum																		$ 10,300,000
141 Livingston Street, Brooklyn [Member] | Wells Fargo Bank v Borrower and Operating Partnership [Member]
Lessee, Operating Lease, Renewal Term (Year)																								5 years
Letters of Credit Outstanding, Amount																						$ 10,000,000	$ 10,000,000	$ 10,000,000
Debt Instrument, Fee Amount																						$ 2,200,000	$ 2,200,000
Lessee, Operating Lease, Term of Contract																						5 years	5 years
Dean Street, Prospect Heights [Member] | US Bank [Member] | Interest Rate Cap [Member]
Derivative, Fixed Interest Rate			6.00%
BADF 953 Dean Street Lender LLC [Member] | Dean Street, Prospect Heights [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 8,000,000
Secured First Mortgage Loan [Member] | New York Community Bank [Member] | Flatbush Gardens, Brooklyn, NY [Member]
Debt Instrument, Face Amount													$ 329,000,000
Debt Instrument, Interest Rate, Stated Percentage													3.125%
Debt Instrument, Amortization Period													30 years
Secured First Mortgage Loan [Member] | New York Community Bank [Member] | Flatbush Gardens, Brooklyn, NY [Member] | Prime Rate [Member]
Interest rate													2.75%
First Mortgage Loan With Interest-only Payments [Member] | Citi Real Estate Funding Inc. [Member]
Debt Instrument, Acceleration, Aggregate Reserve Deposit																								$ 10,000,000							$ 10,000,000
First Mortgage Loan With Interest-only Payments [Member] | Citi Real Estate Funding Inc. [Member] | 250 Livingston Street in Brooklyn [Member]
Debt Instrument, Interest Rate, Stated Percentage														3.63%
Proceeds from Issuance of Long-Term Debt														$ 125,000,000
Debt Instrument, Prepayment Option, Number of Months Before Maturity (Month)														3 months
Mortgages and Mezzanine Notes [Member]
Debt, gross																			$ 1,287,226,000			$ 1,286,233,000
Mortgages and Mezzanine Notes [Member] | LNR Partners [Member] | 250 Livingston Street in Brooklyn [Member]
Debt, gross																											$ 125,000,000,000			$ 125,000,000,000
Escrow Deposit																												$ 6,300,000,000
Debt Instrument, Covenant, Net Worth																						100,000,000,000
Debt Instrument, Covenant, Potential Reserve Account																										$ 100,000,000
Debt Instrument, Default, Period to Pay Interest	5 days
Debt Instrument, Interest, Default Interest, and Fees Payable																		$ 9,550,000
Mortgages and Mezzanine Notes 1[Member] | Flatbush Gardens, Brooklyn, NY [Member]
Interest rate																			3.125%
Debt, gross																			$ 329,000,000			329,000,000
Mortgages and Mezzanine Notes 1[Member] | 250 Livingston Street in Brooklyn [Member]
Interest rate																			3.63%
Debt, gross																			$ 125,000,000			125,000,000
Mortgages and Mezzanine Notes 1[Member] | 141 Livingston Street, Brooklyn [Member]
Interest rate																			3.21%
Debt, gross																			$ 100,000,000			100,000,000
Mortgages and Mezzanine Notes 1[Member] | Tribeca House Properties [Member]
Interest rate																			4.506%
Debt, gross																			$ 360,000,000			360,000,000
Mortgages and Mezzanine Notes 1[Member] | Aspen [Member]
Interest rate																			3.68%
Debt, gross																			$ 56,726,000			$ 57,733,000
Mortgages and Mezzanine Notes 1[Member] | LNR Partners [Member] | 250 Livingston Street in Brooklyn [Member]
Debt Instrument, Default, Additional Interest																									5.00%
Secured First Mortgage Note [Member] | Citi Real Estate Funding Inc. [Member] | 141 Livingston Street, Brooklyn [Member]
Debt Instrument, Interest Rate, Stated Percentage												3.21%
Proceeds from Issuance of Long-Term Debt												$ 100,000,000
Debt Instrument, Covenant, Minimum Extension Period to not Fund Reserve Account												5 years
Fixed Interest Rate Financing [Member] | Deutsche Bank [Member] | Tribeca House Properties [Member]
Debt Instrument, Face Amount																																		$ 360,000,000
Debt Instrument, Interest Rate, Stated Percentage																																		4.506%
Mortgages [Member] | Capital One Multifamily Finance LLC [Member] | Aspen [Member]
Debt Instrument, Face Amount															$ 57,299
Debt Instrument, Interest Rate, Stated Percentage															3.68%
Debt Instrument, Amortization Period															30 years
Mortgages [Member] | Capital One Multifamily Finance LLC [Member] | Aspen [Member] | Forecast [Member]
Debt Instrument, Periodic Payment																					$ 321,000
Mortgages [Member] | Metlife Real Estate Lending LLC [Member] | Clover House Loans [Member]
Debt Instrument, Face Amount																																	$ 82,000,000
Debt Instrument, Interest Rate, Effective Percentage																																	3.53%
Mortgages [Member] | Valley National Bank [Member] | Dean Street, Prospect Heights [Member]
Debt Instrument, Face Amount							36,985,000
Mortgages [Member] | Bank Leumi, N.A [Member] | Dean Street, Prospect Heights [Member]
Debt Instrument, Face Amount							37,000,000			$ 30,000,000
Proceeds from Issuance of Debt																$ 6,985,000
Mortgages [Member] | Bank Leumi, N.A [Member] | Dean Street, Prospect Heights [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Effective Percentage										3.25%
Mortgages [Member] | Bank Leumi, N.A [Member] | Dean Street, Prospect Heights [Member] | Prime Rate [Member]
Interest rate										1.60%
Mortgages 2 [Member] | AIG Asset Management[Member] | Residential Property At 1010 Pacific Street [Member]
Debt Instrument, Maximum Borrowing Capacity											$ 52,500,000
Debt Instrument, Term											36 months
Mortgages 2 [Member] | AIG Asset Management[Member] | Residential Property At 1010 Pacific Street [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage											4.10%
Mortgages 2 [Member] | AIG Asset Management[Member] | Residential Property At 1010 Pacific Street [Member] | London Interbank Offered Rate [Member]
Interest rate											3.60%
Mortgages 2 [Member] | Valley National Bank [Member] | Contingent Rate [member]
Debt Instrument, Covenant, Interest Rate, Increase (Decrease)									0.25%
Mortgages 2 [Member] | Valley National Bank [Member] | Residential Property At 1010 Pacific Street [Member]
Debt Instrument, Interest Rate, Stated Percentage						6.37%			5.70%																							5.55%
Debt Instrument, Amortization Period									30 years
Proceeds from Issuance of Long-Term Debt						$ 20,000,000			$ 60,000,000
Debt Instrument, Maximum Borrowing Capacity									80,000,000
Debt Instrument, Term								5 years
Debt Instrument, Contingent Funding									$ 20,000,000
Debt Instrument, Period of Interest Only Payments						16 months			2 years
Loan Agreement [Member] | Valley National Bank [Member]
Escrow Deposits Related to Property Sales		200,000
Short-Term Debt, Refinanced, Amount		2,100,000
Loan Agreement [Member] | Citi Real Estate Funding Inc and Morgan Stanley Bank N.A. [Member] | 1010 Pacific Street, Brooklyn, New York [Member]
Debt Instrument, Face Amount		$ 84,500,000,000
Debt Instrument, Interest Rate, Stated Percentage		5.73%
Senior Notes [Member] | Valley National Bank [Member]
Repayments of Debt		$ 80,000,000
Interest Paid, Excluding Capitalized Interest, Operating Activity		$ 80,400,000
Senior Notes [Member] | Valley National Bank [Member] | Dean Street, Prospect Heights [Member]
Debt Instrument, Face Amount							$ 115,000,000
Debt Instrument, Term							30 months
Debt Instrument, Number of Extensions							2
Debt Instrument, Extension Option Period							6 months
Debt Instrument, Interest Rate Floor							5.50%
Debt Instrument, Payment Guarantee Percentage																	30.00%			30.00%
Senior Notes [Member] | Valley National Bank [Member] | Dean Street, Prospect Heights [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Interest rate							4.00%
Senior Notes [Member] | MF1 Capital LLC [Member] | Dean Street, Prospect Heights [Member]
Debt Instrument, Face Amount			$ 115,000,000
Debt Instrument, Amount of Shortfall Reserve Account			4,250,000
Debt Instrument, Amount of Completion Reserve Deposits			1,550,000
Mezzanine Note Agreement [Member] | Valley National Bank [Member] | Dean Street, Prospect Heights [Member]
Debt Instrument, Face Amount							$ 115,000,000
Mezzanine Note Agreement [Member] | BADF 953 Dean Street Lender LLC [Member] | Dean Street, Prospect Heights [Member]
Proceeds from Issuance of Long-Term Debt							4,500,000
Debt Instrument, Maximum Borrowing Capacity							$ 8,000,000
Debt Instrument, Term							30 months
Debt Instrument, Number of Extensions							2
Debt Instrument, Extension Option Period							6 months
Debt Instrument, Interest Rate Floor							13.00%
Payments for Construction in Process							$ 3,500,000
Debt Instrument, Repaid, Principal			8,000,000
Mezzanine Note Agreement [Member] | BADF 953 Dean Street Lender LLC [Member] | Dean Street, Prospect Heights [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Interest rate							10.00%
Mezzanine Note Agreement [Member] | MF1 Capital LLC [Member] | Dean Street, Prospect Heights [Member]
Debt Instrument, Face Amount			26,750,000
Proceeds from Issuance of Long-Term Debt																	$ 8,250,000
Debt Instrument, Contingent Funding			$ 18,250,000
Construction Loans [Member] | Valley National Bank [Member] | Dean Street, Prospect Heights [Member]
Debt Instrument, Face Amount							$ 62,400,000
Project Loan [Member] | Valley National Bank [Member] | Dean Street, Prospect Heights [Member]
Debt Instrument, Face Amount							$ 15,600,000
Dean Member Loans [Member] | MF1 Capital LLC [Member] | Dean Street, Prospect Heights [Member]
Debt Instrument, Interest Rate, Stated Percentage			2.65%
Debt Instrument, Interest Rate, Effective Percentage																	6.27%			6.27%
Debt Instrument, Number of Extensions			3
Debt Instrument, Extension Option Period			1 year
Debt Instrument, Interest Rate Floor			2.25%
Senior Notes | Valley National Bank [Member] | Dean Street, Prospect Heights [Member]
Debt Instrument, Repaid, Principal			$ 115,000,000
Senior Loan and Mezzanine Loan [Member] | Dean Street, Prospect Heights [Member]
Debt Instrument, Fee Amount			3,104,000
Interest Paid, Excluding Capitalized Interest, Operating Activity			$ 2,900,000
Line of Credit [Member] | Valley National Bank [Member] | Dean Street, Prospect Heights [Member]
Line of Credit Facility, Maximum Borrowing Capacity																													$ 10,000,000
Long-Term Line of Credit				$ 5,000,000
Line of Credit [Member] | Valley National Bank [Member] | Dean Street, Prospect Heights [Member] | Prime Rate [Member]
Interest rate			4.00%

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- Definition

The amount of aggregate reserve deposit due as a result of loan acceleration.

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Period for amortization on the debt instrument.

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Amount of additional funding available from a debt instrument contingent on certain financial targets.

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Incremental percentage increase (decrease) in the stated rate on a debt instrument that is possible to achieve if certain covenants are met.

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Minimum period of extension on the debt instrument required to not have to fund a reserve account.

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A covenant for a debt instrument requiring that the company to main a level of net worth.

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Amount of potential reserve account required under certain conditions according to the covenant of the debt instrument.

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Percentage of additional interest in the event of default on the debt instrument.

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Period to pay interest that a failure would result in default on the debt instrument.

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Maximum borrowing capacity under the debt instrument.

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The number of extension of the debt instrument.

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Represents the percentage of payment guarantee on a debt instrument.

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Period for interest only payments on the debt instrument.

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Represents the period of time before the maturity date, during which period the entity has the option to prepay all (but not less than all) of the unpaid balance of the debt instrument without a prepayment premium.

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The amount of rent payments per annum provided from the rental property.

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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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Face (par) amount of debt instrument at time of issuance.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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