Note 6 - Mortgage and Other Indebtedness - Schedule of Debt Balance (Details) - USD ($) $ in Thousands		1 Months Ended	6 Months Ended		12 Months Ended
		Dec. 31, 2019	Jun. 30, 2021		Dec. 31, 2020		Mar. 31, 2021
Debt Instrument [Line Items]
Balance outstanding			$ 159,944		$ 122,977
Unamortized deferred financing costs			(1,184)		(917)
Total Mortgage and Other Indebtedness			$ 158,760		$ 122,060
Basis Term Loan [Member]
Debt Instrument [Line Items]
Maturity Date		Jan. 01, 2023	Jan. 01, 2023		Jan. 01, 2023
Rate Type	[1]		Floating		Floating
Interest Rate		6.125%	6.125%	[2]	6.125%	[2]
Balance outstanding			$ 66,625		$ 66,439
Basis Preferred Interest [Member]
Debt Instrument [Line Items]
Maturity Date	[3],[4]		Jan. 01, 2023		Jan. 01, 2023
Rate Type	[4]		Fixed		Fixed
Interest Rate	[2],[4],[5]		14.00%		14.00%
Balance outstanding	[4]		$ 9,970		$ 11,434
MVB Term Loan [Member]
Debt Instrument [Line Items]
Maturity Date			Dec. 27, 2022		Dec. 27, 2022
Rate Type			Fixed		Fixed
Interest Rate	[2]		6.75%		6.75%
Balance outstanding			$ 4,109		$ 4,277
Hollinswood Loan [Member]
Debt Instrument [Line Items]
Maturity Date			Dec. 01, 2024		Dec. 01, 2024
Rate Type	[6]		LIBOR + 2.25%		LIBOR + 2.25%
Interest Rate	[2]		4.06%		4.06%
Balance outstanding			$ 13,144		$ 11,670
Avondale Shops Loan [Member]
Debt Instrument [Line Items]
Maturity Date			Jun. 01, 2025		Jun. 01, 2025
Rate Type			Fixed		Fixed
Interest Rate	[2]		4.00%		4.00%
Balance outstanding			$ 3,152		$ 3,205
Vista Shops at Golden Mile Loan [Member]
Debt Instrument [Line Items]
Maturity Date			Jun. 24, 2023		Jun. 24, 2023
Rate Type			Fixed		Fixed
Interest Rate			3.83%	[2]	3.83%	[2]	3.83%
Balance outstanding			$ 11,648		$ 8,902
Total Mortgage and Other Indebtedness							$ 11,700
Brookhill Azalea Shopping Center Loan [Member]
Debt Instrument [Line Items]
Maturity Date			Jan. 31, 2025		Jan. 31, 2025
Rate Type			LIBOR + 2.75%		LIBOR + 2.75%
Interest Rate	[2]		2.85%		2.85%
Balance outstanding			$ 9,238		$ 9,432
Lamar Station Plaza East Loan [Member]
Debt Instrument [Line Items]
Maturity Date	[7]		Jul. 17, 2022		Jul. 17, 2022
Rate Type	[8]		LIBOR + 3.00%		LIBOR + 3.00%
Interest Rate	[2]		4.00%		4.00%
Balance outstanding			$ 3,515		$ 3,446
Cromwell Land Loan [Member]
Debt Instrument [Line Items]
Maturity Date	[9]		Jan. 10, 2023		Jan. 10, 2023
Rate Type	[9]				Fixed
Interest Rate	[2],[9]				6.75%
Balance outstanding	[9]				$ 1,415
First Paycheck Protection Program Loan [Member]
Debt Instrument [Line Items]
Maturity Date	[10]		Apr. 20, 2022		Apr. 20, 2022
Rate Type			Fixed		Fixed
Interest Rate	[2]		1.00%		1.00%
Balance outstanding					$ 757
Second Paycheck Protection Program Loan [Member]
Debt Instrument [Line Items]
Maturity Date			Mar. 18, 2026		Mar. 18, 2026
Rate Type			Fixed		Fixed
Interest Rate	[2]		1.00%		1.00%
Balance outstanding			$ 769
Lamont Street Preferred Interest [Member]
Debt Instrument [Line Items]
Maturity Date	[11]		Sep. 30, 2023
Rate Type	[11]		Fixed
Interest Rate	[2],[11]		13.50%
Balance outstanding	[11]		$ 4,744
Highlandtown Village Shopping Center Loan [Member]
Debt Instrument [Line Items]
Maturity Date			May 06, 2023
Rate Type			Fixed
Interest Rate	[2]		4.132%
Balance outstanding			$ 5,422
Cromwell Field Shopping Center Loan [Member]
Debt Instrument [Line Items]
Maturity Date	[11]		Nov. 15, 2022
Rate Type	[12]		LIBOR + 5.40%
Interest Rate	[2]		5.90%
Balance outstanding			$ 12,166
Cromwell Field Shopping Center Mezzanine Loan [Member]
Debt Instrument [Line Items]
Maturity Date			Nov. 15, 2022
Rate Type			Fixed
Interest Rate	[2]		10.00%
Balance outstanding			$ 1,502
Spotswood Valley Square Shopping Center Loan [Member]
Debt Instrument [Line Items]
Maturity Date			Jul. 06, 2023
Rate Type			Fixed
Interest Rate	[2]		4.8235%
Balance outstanding			$ 12,219
MVB Revolver [Member]
Debt Instrument [Line Items]
Maturity Date			Dec. 27, 2021		Dec. 27, 2021
Rate Type	[13]		Floating		Floating
Interest Rate	[2]		6.75%		6.75%
Balance outstanding			$ 1,721		$ 2,000

[1] The interest rate for the Basis Term Loan is the greater of (i) LIBOR plus 3.850% per annum and (ii) 6.125% per annum. The Company has entered into an interest rate cap that caps the LIBOR rate on this loan at 3.5%.

[2] For floating rate loans tied to LIBOR, based on the one-month LIBOR rate of 0.10%, as of June 30, 2021.

[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 $1.3 million and $1.8 million of indebtedness as of June 30, 2021 and December 31, 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 approximately $1.9 million was outstanding at June 30, 2021. The Preferred Investor is entitled to a cumulative annual return of 13.0% on the additional contributions.

[6] The Company has entered into an interest rate swap which fixes the interest rate of the loan at 4.06%.

[7] In July 2021, the Company entered into a modification to the Lamar Station Plaza East loan to extend the maturity date to July 2022 as described below under the heading “—Mortgage Indebtedness”.

[8] The interest rate on the Lamar Station Plaza East loan is LIBOR plus 3.00% per annum with a minimum LIBOR rate of 1.00%.

[9] The Company paid off the remaining principal balance of the Cromwell land loan during the second quarter of 2021.

[10] During the first quarter of 2021, the Company received forgiveness for its first Paycheck Protection Program Loan as described below under the heading “—PPP Loans”.

[11] The outstanding balance includes approximately $0.9 million of indebtedness as of June 30, 2021 related to the Lamont Street Minimum Multiple Amount owed to Lamont Street as described below under the heading “—Lamont Street Preferred Interest”.

[12] The interest rate on the Cromwell Field Shopping Center Loan is LIBOR plus 5.40% per annum with a minimum LIBOR rate of 0.50%.

[13] The interest rate on the MVB Revolver is the greater of (i) prime rate plus 1.5% and (ii) 6.75%.