Note 7 - Mortgage and Other Indebtedness - (Details Textual)								1 Months Ended	3 Months Ended		12 Months Ended
		May 05, 2023 USD ($)	May 01, 2023 USD ($)	Jan. 01, 2023	Jun. 04, 2021 USD ($)	May 21, 2021 USD ($)	Dec. 27, 2019 USD ($) Derivative	Dec. 31, 2019 USD ($) Subsidiary	Mar. 31, 2023 USD ($) $ / shares	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Nov. 23, 2022	Aug. 01, 2022	Oct. 06, 2021 USD ($)
Debt Instrument [Line Items]
Maturity date description									the Basis Term Loan (as defined below), has an outstanding balance of $66.9 million and matures on January 1, 2024, subject to the remaining one-year extension option that is subject to certain conditions, including a material adverse change clause, and approval by the lender.
Long-term debt outstanding									$ 266,881,000
Interest expense									4,781,000	$ 2,588,000
Balance outstanding									266,881,000
Principal balance of mortgage loan									262,658,000		$ 267,616,000
Income (expenses) related to fair value adjustments on derivatives									(600,000)	1,800,000
Net gain on fair value change of debt held under the fair value option									3,235,000	0
Change in fair value due to credit risk on debt held under the fair value option									1,732,000	$ 0
Mortgages [Member]
Debt Instrument [Line Items]
Outstanding mortgage indebtedness									179,800,000		180,300,000
Mortgage Loan [Member]
Debt Instrument [Line Items]
Long-term debt outstanding									11,800,000
Balance outstanding									$ 11,800,000
Fortress Mezzanine Loan [Member]
Debt Instrument [Line Items]
Debt instrument variable rate									12.00%
Fair value of loans									$ 13,200,000		17,900,000
Debt Instrument, common stock conversion price | $ / shares									$ 2.00
Interest expense									$ 500,000
Principal balance of mortgage loan									$ 15,000,000.0
Long term debt maturity date									Dec. 01, 2027
Net gain on fair value change of debt held under the fair value option									$ 3,200,000
Change in fair value due to credit risk on debt held under the fair value option									1,700,000
Capitalized interest									$ 300,000
Subsequent Event [Member] | Highlandtown Village Shopping Center [Member]
Debt Instrument [Line Items]
Principal balance of mortgage loan		$ 8,700,000
Subsequent Event [Member] | Mortgage Loan [Member] | Highlandtown Village Shopping Center [Member]
Debt Instrument [Line Items]
Mortgage loan maturity period		2028-05
LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate									4.86%
SOFR [Member] | Subsequent Event [Member] | Highlandtown Village Shopping Center [Member]
Debt Instrument [Line Items]
Debt instrument variable rate		2.50%
Current Interest Rate [Member] | Fortress Mezzanine Loan [Member]
Debt Instrument [Line Items]
Debt instrument variable rate									5.00%
Capitalized Interest Rate [Member] | Fortress Mezzanine Loan [Member]
Debt Instrument [Line Items]
Debt instrument variable rate									7.00%
Debt Instrument, interest rate increase each year									1.00%
Interest Rate Cap [Member] | Other Assets, Net [Member]
Debt Instrument [Line Items]
Fair value of derivative assets									$ 200,000		200,000
Interest Rate Swap [Member] | Other Assets, Net [Member]
Debt Instrument [Line Items]
Fair value of derivative assets									2,600,000		3,200,000
Interest Rate Swap [Member] | Subsequent Event [Member] | Highlandtown Village Shopping Center [Member]
Debt Instrument [Line Items]
Debt instrument, effective interest rate		6.085%
Interest Rate Swap [Member] | Subsequent Event [Member] | Mortgage Loan [Member] | Highlandtown Village Shopping Center [Member]
Debt Instrument [Line Items]
Debt instrument, effective interest rate		6.085%
Basis Term Loan [Member]
Debt Instrument [Line Items]
Number of subsidiaries as borrowers entered in loan agreement | Subsidiary								6
Mortgage loans									$ 66,900,000
Maturity date									Jan. 01, 2024
Maturity date description									The Basis Term Loan initial maturity was January 1, 2023, subject to two one-year extension options, subject to certain conditions.
Long-term debt outstanding									$ 66,900,000
Balance outstanding									66,900,000
Debt instrument net of discount									$ 57,000		$ 79,000
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%
Debt instrument variable rate	[1]								8.62%
Basis Term Loan [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Mortgage loans							$ 66,900,000
Debt instrument, effective interest rate									8.62%		6.125%
Basis Term Loan [Member] | Interest Rate Cap [Member] | LIBOR [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								$ 66,900,000
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%
Lamont Street Preferred Interest [Member]
Debt Instrument [Line Items]
Long-term debt outstanding									$ 300,000
Description on extended redemption date									September 30, 2024 and September 30, 2025
Payment fee percentage, first extension option									0.25%
Payment fee percentage, second extension option									0.50%
Preferred Investor payments, description									Additionally, at the Lamont Street Redemption Date, Lamont Street is entitled to (i) a redemption fee of 0.50% of the capital contributions returned and (ii) an amount equal to (a) the product of (i) the aggregate amount of capital contributions made and (ii) 0.26 less (b) the aggregate amount of Lamont Street Class A Return payments made to Lamont Street (the “Lamont Street Minimum Multiple Amount”).
Percentage of redemption fee of capital contribution returned									0.50%
Balance outstanding									$ 300,000
Lamont Street Preferred Interest [Member] | Class A Units [Member]
Debt Instrument [Line Items]
Annual return percentage on initial capital contribution									13.50%
Cumulative annual return percentage, paid current									10.00%
Cumulative annual return percentage, accrued									3.50%
Lamont Street Preferred Interest [Member] | Class A Units [Member] | Highlandtown [Member]
Debt Instrument [Line Items]
Preferred investor, capital contribution						$ 3,900,000
Interest percentage in exchange of capital contribution						1.00%
Lamont Street Preferred Interest [Member] | Class A Units [Member] | Spotswood [Member]
Debt Instrument [Line Items]
Preferred investor, capital contribution					$ 3,900,000
Interest percentage in exchange of capital contribution					1.00%
Lamont Street Preferred Interest [Member] | Minimum [Member] | Highlandtown [Member]
Debt Instrument [Line Items]
Preferred investor approval rights, Minimum amount of capital expenditure to be incurred									$ 100,000
Lamont Street Preferred Interest [Member] | Minimum [Member] | Spotswood [Member]
Debt Instrument [Line Items]
Preferred investor approval rights, Minimum amount of capital expenditure to be incurred									$ 100,000
Greenwood Village [Member] | Mortgage Loan [Member]
Debt Instrument [Line Items]
Mortgage loan maturity period									2028-10
Mortgage loan secured by the property														$ 23,500,000
Greenwood Village [Member] | Subsequent Event [Member] | Mortgage Loan [Member]
Debt Instrument [Line Items]
Debt instrument, effective interest rate			5.85%
Greenwood Village [Member] | Prime Rate [Member] | Mortgage Loan [Member]
Debt Instrument [Line Items]
Debt instrument variable rate														0.35%
Greenwood Village [Member] | SOFR [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt instrument variable rate			2.85%
Debt instrument, effective interest rate			5.85%
Greenwood Village [Member] | SOFR [Member] | Subsequent Event [Member] | Mortgage Loan [Member]
Debt Instrument [Line Items]
Debt instrument variable rate			2.85%
Greenwood Village [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Interest Rate														4.082%
Greenwood Village [Member] | Interest Rate Swap [Member] | Mortgage Loan [Member]
Debt Instrument [Line Items]
Debt instrument, effective interest rate														4.082%
Greenwood Village [Member] | Interest Rate Swap [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt instrument, effective interest rate			5.85%
Amount recieved on termination			$ 2,200,000
Highlandtown Mortgage [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Repayments of secured debt		$ 1,900,000
Vista Shops at Golden Mile Loan [Member]
Debt Instrument [Line Items]
Maturity date									Jun. 24, 2023
Debt instrument variable rate	[1]								3.83%
Debt instrument net of discount									$ 1,000		$ 12,000
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							$ 10,200,000
Debt instrument additional borrowing available							3,000,000.0
Balance outstanding							$ 10,200,000
Number of derivatives held | Derivative							2

[1] At March 31, 2023, the floating rate loans tied to the London Inter-Bank Offered Rate (“LIBOR”) were based on the one-month LIBOR rate of 4.86%.