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Note 12 - Related Party Transactions - (Details Textual)		3 Months Ended
	Dec. 27, 2020 Merger shares	Mar. 31, 2021 USD ($) property	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jan. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Receivables due from related parties \| $		$ 600,000		$ 500,000
Revenue from related parties \| $		$ 500,000	$ 400,000
Number of properties to be acquired \| property		6
Ground lease revenues \| $		$ 4,918,000	5,124,000
BBL Property [Member]
Related Party Transaction [Line Items]
Ownership interest percentage		0.00%
Minimum [Member]
Related Party Transaction [Line Items]
Percentage of management fee		3.00%
Maximum [Member]
Related Party Transaction [Line Items]
Percentage of management fee		4.00%
Maximum [Member] \| Cromwell Field Shopping Center [Member]
Related Party Transaction [Line Items]
Ground lease revenues \| $		$ 100,000	100,000
Broad Street Entities [Member]
Related Party Transaction [Line Items]
Number of Mergers Remaining \| Merger	6
Thomas M. Yockey [Member] \| Broad Street Entities [Member] \| Common Stock [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers	2,004,146
Remaining equity interest issued as consideration for the mergers	547,513
Thomas M. Yockey [Member] \| Broad Street Entities [Member] \| OP units [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers	420,523
Remaining equity interest issued as consideration for the mergers	136,213
Michael Z. Jacoby [Member] \| Broad Street Entities [Member] \| Common Stock [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers	2,004,146
Remaining equity interest issued as consideration for the mergers	547,513
Michael Z. Jacoby [Member] \| Broad Street Entities [Member] \| OP units [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers	856,805
Remaining equity interest issued as consideration for the mergers	136,213
Alexander Topchy [Member] \| Broad Street Entities [Member] \| Common Stock [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers	96,281
Remaining equity interest issued as consideration for the mergers	43,001
Alexander Topchy [Member] \| Broad Street Entities [Member] \| OP units [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers	48,320
Remaining equity interest issued as consideration for the mergers	14,338
Daniel J.W. Neal [Member] \| Broad Street Entities [Member] \| Common Stock [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers	521,996
Remaining equity interest issued as consideration for the mergers	361,127
Timbergate Ventures, LLC [Member] \| Thomas M. Yockey [Member]
Related Party Transaction [Line Items]
Related party consulting agreement term		2 years
Related party consulting fees \| $		$ 200,000
Related party general and administrative expenses \| $		50,000	50,000
Shulman Rogers LLP [Member] \| Samuel M. Spiritos [Member] \| Maximum [Member]
Related Party Transaction [Line Items]
Related party legal fees \| $		100,000	$ 100,000
Other Assets, Net [Member]
Related Party Transaction [Line Items]
Receivables due from related parties \| $		200,000
Other Assets, Net [Member] \| Due from Properties Managed by Company [Member]
Related Party Transaction [Line Items]
Receivables due from related parties \| $				200,000
Payables Due to Related Parties [Member] \| Due to Properties Managed by Company [Member] \| Borrowed by Company for Working Capital [Member]
Related Party Transaction [Line Items]
Payables due to related parties \| $		1,100,000		$ 700,000
Accounts Payable and Accrued Expenses [Member] \| BSR [Member] \| Thomas M. Yockey [Member]
Related Party Transaction [Line Items]
Consideration to be paid in exchange for repurchasing ownership interest \| $						$ 1,500,000
Consideration paid in exchange for repurchasing ownership interest \| $					$ 1,000,000
Consideration payable in exchange for repurchasing ownership interest \| $		$ 500,000