Note 5 - Debt - Schedule of Debt Balance (Parenthetical) (Details) - USD ($) $ in Thousands				1 Months Ended		3 Months Ended		12 Months Ended
		Jun. 16, 2020	Dec. 27, 2019	Jun. 30, 2020	Dec. 31, 2019	Mar. 31, 2021		Dec. 31, 2020
Debt Instrument [Line Items]
Debt instrument net of discount						$ 900		$ 900
Balance outstanding						$ 126,986
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
LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate						0.11%
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						$ 653		$ 745
Interest Rate					6.125%	6.125%	[1]	6.125%	[1]
Balance outstanding						$ 66,900
Preferred investor, additional capital contribution						$ 2,900
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						$ 131		$ 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						$ 83
Interest Rate	[1]					3.83%		3.83%
Lamar Station Plaza East Loan [Member]
Debt Instrument [Line Items]
Debt instrument net of discount						$ 4		$ 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						$ 8		$ 10
Interest Rate	[1]					6.75%		6.75%
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]					2.86%		2.86%
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						$ 1,500		$ 1,800
Basis Preferred Interest Minimum Multiple Amount [Member] | Sub-OP [Member]
Debt Instrument [Line Items]
Balance outstanding						$ 1,500
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%

[1] For floating rate loans tied to LIBOR, based on the one-month LIBOR rate of 0.11%, as of March 31, 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”. The Preferred Investor is entitled to a cumulative annual return of 13.0% on the additional contributions.

[3] The outstanding balance includes approximately $1.5 million and $1.8 million of indebtedness as of March 31, 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”.