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Note 5 - Notes Payable (Details Textual) - USD ($) $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 60 Months Ended | 132 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 22, 2021 | Aug. 10, 2021 | Feb. 18, 2021 | May 08, 2020 | Dec. 24, 2019 | May 31, 2019 | Apr. 30, 2022 | Mar. 31, 2022 | Mar. 31, 2021 | Nov. 01, 2027 | Jul. 31, 2028 | Dec. 31, 2021 | Jun. 30, 2021 | Nov. 08, 2019 | Feb. 21, 2018 | Oct. 27, 2017 | Jun. 27, 2016
Long-term Debt, Gross |  |  |  |  |  |  |  | $ 1,151,115 |  |  |  | $ 1,144,052 |  |  |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  |  |  |  |  |  |  | $ 0 | $ (3,034) |  |  |  |  |  |  |  |
Metlife Real Estate Lending LLC [Member] | Clover House Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 82,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.53% |  |  |
Secured First Mortgage Loan [Member] | New York Community Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 329,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.125% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest and Principal Payments Period (Year) |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |
Secured First Mortgage Loan [Member] | New York Community Bank [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.75% |  |  |  |  |  |  |  |  |  |  |  |  |
First Mortgage Loan With Interest-only Payments [Member] | Citi Real Estate Funding Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 3.63% |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  |  | $ 125,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Prepayment Option, Number of Months Before Maturity (Month) |  |  |  |  |  | 3 months |  |  |  |  |  |  |  |  |  |  |
Mortgages 2 [Member] | New York Community Bank [Member] | 141 Livingston Street, Brooklyn [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 79,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgages 2 [Member] | AIG Asset Management[Member] | Residential Property At 1010 Pacific Street [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 4.10% |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  |  |  |  | $ 7,617 |  |  |  |  |  |  |  |  |
Debt Instrument, Prepayment Option, Number of Months Before Maturity (Month) |  | 5 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  | 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] | London Interbank Offered Rate (LIBOR) [Member] | Residential Property At 1010 Pacific Street [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 3.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Agreement Maximum Borrowing Capacity |  | $ 52,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured First Mortgage Note [Member] | Citi Real Estate Funding Inc. [Member] | 141 Livingston Street, Brooklyn [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.21% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Prepayment Option, Number of Months Before Maturity (Month) |  |  | 3 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  |  |  |  |  |  |  |  | $ (3,034) |  |  |  |  |  |  |  |
Fixed Interest Rate Financing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.506% |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 360,000 |  |
Mortgages [Member] | New York Community Bank [Member] | Property at 10 W 65th St. Manhattan, NY [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.375% |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,350 |
Mortgages [Member] | New York Community Bank [Member] | Prime Rate [Member] | Property at 10 W 65th St. Manhattan, NY [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  |  |  |  |  | $ 152 |  |  |  |  |  |  |
Mortgages [Member] | Capital One Multifamily Finance LLC [Member] | Aspen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.68%
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 70,000
Mortgages [Member] | Capital One Multifamily Finance LLC [Member] | Aspen [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  |  |  |  |  |  |  |  | $ 321 |  |  |  |  |  |
Mortgages [Member] | Citibank NA [Member] | Residential Property At 1010 Pacific Street [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | $ 18,600 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 4.85% |  |  |  |
Mortgages [Member] | Citibank NA [Member] | Residential Property At 1010 Pacific Street [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
Mortgages [Member] | Citibank NA [Member] | London Interbank Offered Rate (LIBOR) [Member] | Residential Property At 1010 Pacific Street [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 3.60% |  |  |  |  |  |  |  |  |  |  |  |
Mortgages [Member] | Bank Leumi, N.A [Member] | Dean Street, Prospect Heights [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 30,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 5.10% |  |  |  |  |  |  |  |  |
Mortgages [Member] | Bank Leumi, N.A [Member] | Dean Street, Prospect Heights [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  | $ 6,985 |  |  |  |  |  |  |  |  |  |
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] | Prime Rate [Member] | Dean Street, Prospect Heights [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction Loans [Member] | Citibank NA [Member] | Residential Property At 1010 Pacific Street [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Agreement Maximum Borrowing Capacity |  |  |  |  | $ 2,987 |  |  |  |  |  |  |  |  |  |  |  |

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