Note 7 - Mortgage and Other Indebtedness - (Details Textual) $ in Thousands							1 Months Ended	3 Months Ended		12 Months Ended
		Apr. 30, 2024 USD ($)	Feb. 28, 2024	Feb. 08, 2024 USD ($)	Jun. 28, 2023	Dec. 27, 2019 USD ($) Derivative	Dec. 31, 2019 USD ($) Subsidiary	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	May 05, 2023	May 01, 2023 USD ($)	Nov. 23, 2022 USD ($)	Aug. 01, 2022
Debt Instrument [Line Items]
Maturity date description								the Basis Term Loan (as defined below) had an outstanding principal balance of $8.5 million and had a maturity date of July 1, 2024.
Long-term debt outstanding								$ 240,267
Interest expense								4,333	$ 4,781
Balance outstanding								240,267
Mortgage loan								234,272		$ 231,049
Income (expenses) related to fair value adjustments on derivatives								400	(600)
Net gain on fair value change on debt held under the fair value option								2,343	3,235
Change in fair value due to credit risk on debt held under the fair value option								740	1,732
Vista Shops at Golden Mile [Member]
Debt Instrument [Line Items]
Mortgage loans				$ 16,200
Mortgages [Member]
Debt Instrument [Line Items]
Outstanding mortgage indebtedness								214,500		208,400
Mortgage Loan [Member] | Vista Shops at Golden Mile [Member]
Debt Instrument [Line Items]
Debt instrument variable rate					7.73%
Mortgage loan maturity period			2029-02		2024-06
Fortress Mezzanine Loan [Member]
Debt Instrument [Line Items]
Fair value of loans								13,400		16,200
Interest expense								$ 500	500
Long term debt maturity date								Dec. 01, 2027
Mortgage loan								$ 15,000
Net gain on fair value change on debt held under the fair value option								2,300	3,200
Change in fair value due to credit risk on debt held under the fair value option								700	1,700
Capitalized interest								300	$ 300
SOFR [Member] | Mortgage Loan [Member] | Vista Shops at Golden Mile [Member]
Debt Instrument [Line Items]
Debt instrument variable rate				2.75%
Interest Rate Swap [Member] | Derivative Assets [Member]
Debt Instrument [Line Items]
Fair value of interest rate cap assets								1,200		$ 800
Interest Rate Swap [Member] | Highlandtown Village Shopping Center [Member]
Debt Instrument [Line Items]
Debt instrument, effective interest rate											6.085%
Interest Rate Swap [Member] | Mortgage Loan [Member] | Vista Shops at Golden Mile [Member]
Debt Instrument [Line Items]
Debt instrument, effective interest rate				6.90%
Basis Term Loan [Member]
Debt Instrument [Line Items]
Number of subsidiaries as borrowers entered in loan agreement | Subsidiary							6
Mortgage loans								$ 8,500
Maturity date description								The Basis Term Loan initial maturity was January 1, 2023, subject to two one-year extension options, subject to certain conditions.
Debt instrument variable rate	[1]							8.62%
Debt instrument, effective interest rate								8.62%
Basis Term Loan [Member] | SOFR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate							3.97%	3.97%
Basis Term Loan [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Mortgage loans						$ 66,900							$ 66,900
Debt instrument, effective interest rate								8.62%	8.62%
Basis Term Loan [Member] | Interest Rate Cap [Member] | London Interbank Offered Rate [Member]
Debt Instrument [Line Items]
Debt instrument variable rate								3.50%
Basis Term Loan [Member] | Interest Rate Cap [Member] | SOFR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate						3.97%
Debt instrument variable rate													4.65%	3.50%
Basis Term Loan [Member] | Maximum [Member]
Debt Instrument [Line Items]
Mortgage loans							$ 66,900
Debt instrument variable rate							6.125%	6.125%
Basis Term Loan [Member] | Maximum [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Debt instrument variable rate						6.125%
Greenwood Village [Member]
Debt Instrument [Line Items]
Debt instrument, effective interest rate												5.85%
Greenwood Village [Member] | SOFR [Member]
Debt Instrument [Line Items]
Debt instrument, effective interest rate												5.85%
Greenwood Village [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Debt instrument, effective interest rate												5.85%
Amount recieved on termination												$ 2,200
Midtown Colonial and Midtown Lamonticello Properties [Member] | Subsequent Event [Member] | Mortgage Loan [Member]
Debt Instrument [Line Items]
Mortgage loans		$ 19,200
Debt instrument variable rate		7.92%
Mortgage loan maturity period		2027-05
Hollinswood Loan [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Debt instrument variable rate						4.06%
Hollinswood Loan [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Long-term debt outstanding						$ 10,200
Debt instrument additional borrowing available						3,000
Balance outstanding						$ 10,200
Number of derivatives held | Derivative						2

[1] Interest rates are as of March 31, 2024.