Note 6 - Mortgage and Other Indebtedness (Details Textual)								1 Months Ended				3 Months Ended	12 Months Ended
		Mar. 31, 2022 USD ($)	Mar. 22, 2022 USD ($)	Jun. 04, 2021 USD ($)	May 21, 2021 USD ($)	Jun. 16, 2020 USD ($)	Dec. 27, 2019 USD ($) Derivative	Jul. 31, 2021	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Oct. 06, 2021 USD ($)	Oct. 01, 2021 USD ($)	Sep. 30, 2021	Mar. 18, 2021 USD ($)	Jun. 30, 2020 USD ($)	Apr. 20, 2020 USD ($)
Debt Instrument [Line Items]
Long-term debt outstanding													$ 181,075,000
Maturity date description													the Basis Term Loan and the Basis Preferred Interest (each as defined below), totaling approximately $75.4 million, mature on January 1, 2023, subject to two one-year extension options that are subject to certain conditions, including a Material Adverse Change clause.
Interest expense													$ 9,961,000	$ 6,676,000
Preferred investor approval rights, Minimum amount of capital expenditure to be incurred													250,000
Repayments of debt													14,221,000	3,308,000
Long Term Debt Net Of Discount										$ 122,977,000			180,097,000	122,977,000
Principal balance of mortgage loan										122,060,000			178,982,000	122,060,000
Deferred financing costs, gross										1,400,000			2,100,000	1,400,000
Deferred financing costs, net										900,000			1,100,000	900,000
Debt discounts, gross										1,400,000			2,100,000	1,400,000
Debt instrument net of discount										900,000			1,000,000.0	900,000
Income (expenses) related to fair value adjustments on derivatives													$ 400,000	600,000
MVB Revolver [Member]
Debt Instrument [Line Items]
Maturity date	[1]												Dec. 27, 2022
Interest Rate	[2]												6.75%
Long Term Debt Net Of Discount										2,000,000			$ 1,404,000	2,000,000
PPP Loan [Member]
Debt Instrument [Line Items]
Unsecured loan																					$ 800,000
Second PPP Loan [Member]
Debt Instrument [Line Items]
Unsecured loan																			$ 800,000
Mortgage Loan [Member]
Debt Instrument [Line Items]
Mortgage loan maturity period													2010-10
Mortgage loan secured by the property																$ 23,500,000
Mortgages [Member]
Debt Instrument [Line Items]
Outstanding mortgage indebtedness													$ 94,900,000	38,100,000
Sub-OP [Member]
Debt Instrument [Line Items]
Preferred investor, additional capital contribution						$ 2,900,000														$ 2,900,000
Proceeds from refinance to repayment						(750,000)
Preferred Units Available Contributed Capital						300,000											$ 1,000,000.0
Preferred units remaining contributed capital																	$ 0
LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate													0.10%
Prime Rate [Member] | MVB Revolver [Member]
Debt Instrument [Line Items]
Debt instrument variable rate													1.50%
Prime Rate [Member] | Mortgage Loan [Member]
Debt Instrument [Line Items]
Interest Rate																0.35%
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Fair value of interest rate swap liability										700,000			$ 400,000	700,000
Interest Rate Swap [Member] | Accounts Payable and Accrued Expenses [Member]
Debt Instrument [Line Items]
Fair value of interest rate swap liability										700,000			$ 400,000	700,000
Interest Rate Swap [Member] | MVB Revolver [Member]
Debt Instrument [Line Items]
Interest Rate													4.06%
Interest Rate Swap [Member] | Mortgage Loan [Member]
Debt Instrument [Line Items]
Interest Rate																4.082%
Maximum [Member]
Debt Instrument [Line Items]
Deferred financing costs, amortization expense													$ 1,300,000	900,000
Maximum [Member] | Interest Rate Cap [Member] | Other Assets, Net [Member]
Debt Instrument [Line Items]
Fair value of interest rate cap assets										$ 100,000			100,000	$ 100,000
Basis Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt outstanding													$ 66,900,000
Maturity date													Jan. 01, 2023
Maturity date description													The Basis Term Loan matures on January 1, 2023, subject to two one-year extension options, subject to certain conditions.
Interest Rate	[2]												6.125%
Interest Rate										6.125%	6.125%		6.125%	6.125%	6.125%
Long Term Debt Net Of Discount										$ 66,439,000			$ 66,811,000	$ 66,439,000
Debt instrument net of discount										745,000			$ 373,000	745,000
Basis Term Loan [Member] | Sub-OP [Member]
Debt Instrument [Line Items]
Preferred investor, additional capital contribution						2,400,000
Basis Term Loan [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate													3.85%		3.85%
Basis Term Loan [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Long-term debt amount							$ 66,900,000
Debt instrument variable rate							6.125%
Basis Term Loan [Member] | Interest Rate Cap [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate							3.85%						3.50%
Derivative variable rate											3.50%				3.50%
Debt instrument, effective interest rate							3.50%
Basis Term Loan [Member] | Maximum [Member]
Debt Instrument [Line Items]
Long-term debt amount											$ 66,900,000				$ 66,900,000
Basis Preferred Interest [Member]
Debt Instrument [Line Items]
Maturity date	[3],[4]												Jan. 01, 2023
Interest Rate	[2],[4],[5]												14.00%
Long Term Debt Net Of Discount	[4]									11,434,000			$ 8,560,000	11,434,000
Debt instrument net of discount										150,000			75,000	150,000
Basis Preferred Interest [Member] | Sub-OP [Member]
Debt Instrument [Line Items]
Preferred investor investment commitment amount											$ 10,700,000				10,700,000
Preferred investor, capital contribution													$ 6,900,000
Annual return percentage on initial capital contribution											14.00%
Interest percentage on excess of commitment amount											20.00%
Description on extended redemption date													December 31, 2023 and December 31, 2024
Payment fee percentage, first extension option											0.25%
Payment fee percentage, second extension option											0.50%
Preferred Investor payments, description													Additionally, at the Redemption Date, the Preferred Investor is entitled to an amount equal to (a) the product of (i) the aggregate amount of capital contributions made and (ii) 0.4, less (b) the aggregate amount of Class A return payments made to the Preferred Investor (the “Minimum Multiple Amount”).
Basis Preferred Interest [Member] | Sub-OP [Member] | Class A Units [Member]
Debt Instrument [Line Items]
Interest percentage in exchange of capital contribution													1.00%
Basis Preferred Interest [Member] | Maximum [Member]
Debt Instrument [Line Items]
Preferred investor investment commitment amount											$ 10,700,000				10,700,000
Basis Preferred Interest Minimum Multiple Amount [Member]
Debt Instrument [Line Items]
Long-term debt outstanding										$ 1,800,000			$ 800,000	1,800,000
Other Capital Contribution [Member] | Sub-OP [Member]
Debt Instrument [Line Items]
Preferred investor, additional capital contribution						$ 500,000
Preferred units, cumulative annual return						13.00%							13.00%
MVB Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term debt outstanding											6,500,000				6,500,000
Loan agreement deposit requirement													$ 3,000,000.0
Loan agreement deposit requirement default interest charges percentage													1.00%
MVB Loan Agreement [Member] | MVB Revolver [Member]
Debt Instrument [Line Items]
Long-term debt outstanding											$ 2,000,000.0				2,000,000.0
Maturity date									Dec. 27, 2022	Dec. 27, 2021	Dec. 27, 2020		Dec. 27, 2022
Interest Rate													6.75%
Line of credit facility, periodic payment required									$ 250,000
Line of credit facility, payments term									10 years
Repayments of debt									$ 250,000
MVB Loan Agreement [Member] | MVB Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt outstanding											$ 4,500,000				$ 4,500,000
Maturity date											Dec. 27, 2022
Interest Rate											6.75%				6.75%
MVB Loan Agreement [Member] | MVB Term Loan [Member] | MVB Revolver [Member]
Debt Instrument [Line Items]
Debt instrument additional borrowing available													$ 0
MVB Loan Agreement [Member] | Second MVB Term Loan [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Long-term debt outstanding			$ 2,000,000.0
MVB Loan Agreement [Member] | Prime Rate [Member] | MVB Revolver [Member]
Debt Instrument [Line Items]
Debt instrument variable rate											1.50%
MVB Loan Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt service coverage ratio													1.30%
MVB Loan Agreement [Member] | Maximum [Member] | MVB Revolver [Member]
Debt Instrument [Line Items]
Debt service coverage ratio													1.00%
MVB Loan Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt service coverage ratio													1.00%
Consolidated funded debt ratio													8.00%
Funds available under other lines of credit													$ 5,000,000.0
MVB Loan Agreement [Member] | Minimum [Member] | MVB Revolver [Member]
Debt Instrument [Line Items]
Debt service coverage ratio													1.00%
Funds available under other lines of credit													$ 3,000,000.0
MVB Amendments [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Line of credit facility, periodic payment required			$ 250,000
Repayments of debt		$ 250,000
MVB Amendments [Member] | MVB Term Loan [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Maturity date			Jun. 27, 2023
MVB Amendments [Member] | Second MVB Term Loan [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Maturity date			Jun. 27, 2023
Interest Rate			6.75%
MVB Amendments [Member] | Maximum [Member]
Debt Instrument [Line Items]
Consolidated funded debt ratio													8.00%
MVB Amendments [Member] | Minimum [Member]
Debt Instrument [Line Items]
Consolidated funded debt ratio			7.00%
Lamont Street Preferred Interest [Member]
Debt Instrument [Line Items]
Long-term debt outstanding													$ 600,000
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%
Percentage of redemption fee of capital contribution returned													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").
Interest expense												$ 1,000,000.0
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
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
Number of derivatives held | Derivative							2
Lamar Station Plaza East [Member]
Debt Instrument [Line Items]
Maturity date								Jul. 31, 2022
Lamar Station Plaza East [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt service coverage ratio													1.15%					1.05%
Lamar Station Plaza East [Member] | Maximum [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt service coverage ratio		1.25%
Lamar Station Plaza East [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt service coverage ratio													1.00%					1.00%
Lamar Station Plaza East [Member] | Minimum [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt service coverage ratio		1.00%
Vista Shops at Golden Mile Loan [Member]
Debt Instrument [Line Items]
Maturity date	[6]												Jun. 24, 2023
Interest Rate	[2],[6]												3.83%
Interest Rate									3.83%
Long Term Debt Net Of Discount	[6]									$ 8,902,000			$ 11,661,000	8,902,000
Mortgage loan maturity period									2023-06
Principal balance of mortgage loan									$ 11,700,000
Payment of basis preferred interest									$ 1,900,000
Payment of accrued interest												46,000
Payment to escrow account												1,100,000
Debt instrument net of discount										$ 0			$ 39,000	$ 0
Vista Shops at Golden Mile Loan [Member] | Mortgage Loan [Member]
Debt Instrument [Line Items]
Maturity date													Jan. 25, 2021
Vista Shops at Golden Mile Loan [Member] | Sub-OP [Member]
Debt Instrument [Line Items]
Payment of basis preferred interest												$ 750,000
Vista Shops at Golden Mile Loan [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate													2.50%
Greenwood Village [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Interest Rate													4.082%			4.082%

[1] In March 2022, the Company entered into a six-month extension on the MVB Term Loan and MVB Revolver (each as defined below) as described under the heading "—MVB Loans."

[2] At December 31, 2021, the floating rate loans tied to LIBOR were based on the one-month LIBOR rate of 0.1%.

[3] If the Basis Term Loan is paid in full earlier than its maturity date, the Basis Preferred Interest in the Sub-OP (as defined below) will mature at that time.

[4] The outstanding balance includes approximately $0.8 million and $1.8 million of indebtedness as of December 31, 2021 and 2020, respectively, related to the Multiple Minimum Amount owed to the Preferred Investor as described below under the heading “—Basis Preferred Interest.”

[5] In June 2020, the Preferred Investor made additional capital contributions of approximately $2.9 million as described below under the heading “—Basis Preferred Interest” of which $0.9 million was outstanding at December 31, 2021. The Preferred Investor is entitled to a cumulative annual return of 13.0% on the additional contributions.

[6] The Company completed the refinance of this loan in March 2021 as described below under the heading “—Mortgage Indebtedness.” The prior loan matured on January 25, 2021 and carried an interest rate of LIBOR plus 2.5% per annum.