Note 6 - Mortgage and Other Indebtedness - Schedule of Debt Balance (Parenthetical) (Details) - USD ($) $ in Thousands				1 Months Ended		6 Months Ended		12 Months Ended
		Jun. 16, 2020	Dec. 27, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2021		Dec. 31, 2020		Mar. 31, 2021
Debt Instrument [Line Items]
Debt instrument net of discount						$ 1,300		$ 900
Balance outstanding						$ 161,198
MVB Revolver [Member]
Debt Instrument [Line Items]
Interest Rate	[1]					6.75%		6.75%
Sub-OP [Member]
Debt Instrument [Line Items]
Preferred investor, additional capital contribution		$ 2,900		$ 2,900
Preferred investor, additional capital contribution outstanding				$ 1,900
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%
Interest Rate Swap [Member] | Hollinswood Loan [Member]
Debt Instrument [Line Items]
Interest Rate						4.06%
Basis Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument net of discount						$ 560		$ 745
Interest Rate					6.125%	6.125%	[1]	6.125%	[1]
Balance outstanding						$ 66,900
Basis Term Loan [Member] | Sub-OP [Member]
Debt Instrument [Line Items]
Preferred investor, additional capital contribution		2,400
Basis Term Loan [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Debt instrument variable rate			6.125%
Basis Term Loan [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate					3.85%	3.85%
Basis Term Loan [Member] | LIBOR [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Debt instrument variable rate			3.85%			3.50%
Basis Preferred Interest [Member]
Debt Instrument [Line Items]
Debt instrument net of discount						$ 112		$ 150
Interest Rate	[1],[2],[3]					14.00%		14.00%
Vista Shops at Golden Mile Loan [Member]
Debt Instrument [Line Items]
Debt instrument net of discount						$ 52
Interest Rate						3.83%	[1]	3.83%	[1]	3.83%
Lamar Station Plaza East Loan [Member]
Debt Instrument [Line Items]
Debt instrument net of discount						$ 1		$ 7
Interest Rate	[1]					4.00%		4.00%
Lamar Station Plaza East Loan [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate						3.00%		3.00%
Lamar Station Plaza East Loan [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument variable rate						1.00%
Cromwell Land Loan [Member]
Debt Instrument [Line Items]
Debt instrument net of discount						$ 0		$ 10
Interest Rate	[1],[4]							6.75%
Lamont Street Preferred Interest [Member]
Debt Instrument [Line Items]
Debt instrument net of discount						$ 86
Interest Rate	[1],[5]					13.50%
Highlandtown Village Shopping Center Loan [Member]
Debt Instrument [Line Items]
Debt instrument net of discount						$ 63
Interest Rate	[1]					4.132%
Cromwell Field Shopping Center Loan [Member]
Debt Instrument [Line Items]
Debt instrument net of discount						$ 227
Interest Rate	[1]					5.90%
Cromwell Field Shopping Center Loan [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate						5.40%
Cromwell Field Shopping Center Loan [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument variable rate						0.50%
Cromwell Field Shopping Center Mezzanine Loan [Member]
Debt Instrument [Line Items]
Debt instrument net of discount						$ 28
Interest Rate	[1]					10.00%
Spotswood Valley Square Shopping Center Loan [Member]
Debt Instrument [Line Items]
Debt instrument net of discount						$ 125
Interest Rate	[1]					4.8235%
Hollinswood Loan [Member]
Debt Instrument [Line Items]
Interest Rate	[1]					4.06%		4.06%
Hollinswood Loan [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Debt instrument variable rate			4.06%
Hollinswood Loan [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate						2.25%		2.25%
Brookhill Azalea Shopping Center Loan [Member]
Debt Instrument [Line Items]
Interest Rate	[1]					2.85%		2.85%
Brookhill Azalea Shopping Center Loan [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate						2.75%		2.75%
Basis Preferred Interest Minimum Multiple Amount [Member]
Debt Instrument [Line Items]
Balance outstanding						$ 1,300		$ 1,800
Basis Preferred Interest Minimum Multiple Amount [Member] | Sub-OP [Member]
Debt Instrument [Line Items]
Balance outstanding						1,300
Other Capital Contribution [Member] | Sub-OP [Member]
Debt Instrument [Line Items]
Preferred investor, additional capital contribution		$ 500
Preferred units, cumulative annual return		13.00%		13.00%
Lamont Street Minimum Multiple Amount [Member]
Debt Instrument [Line Items]
Balance outstanding						$ 900

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

[2] 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.

[3] 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”.

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

[5] 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”.