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Note 13 - Related Party Transactions - (Details Textual)		3 Months Ended		6 Months Ended
	Dec. 27, 2020 Merger shares	Jun. 30, 2021 USD ($) property	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) property	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jan. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Receivables due from related parties \| $		$ 400,000		$ 400,000		$ 500,000
Revenue from related parties \| $		$ 300,000	$ 400,000	$ 800,000	$ 800,000
Number of properties to be acquired \| property		3		3
Ground lease revenues \| $		$ 5,698,000	4,185,000	$ 10,616,000	9,309,000
BBL Property [Member]
Related Party Transaction [Line Items]
Ownership interest percentage		0.00%		0.00%
Broad Street Entities [Member]
Related Party Transaction [Line Items]
Number of Mergers Remaining \| Merger	3
Thomas M. Yockey [Member] \| Broad Street Entities [Member] \| Common Stock [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers	2,366,950
Remaining equity interest issued as consideration for the mergers	184,685
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	2,366,950
Remaining equity interest issued as consideration for the mergers	184,685
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	120,584
Remaining equity interest issued as consideration for the mergers	18,695
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	774,189
Remaining equity interest issued as consideration for the mergers	120,431
Samuel M. Spiritos [Member] \| Broad Street Entities [Member] \| Common Stock [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers	13,827
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	$ 100,000	100,000
Minimum [Member]
Related Party Transaction [Line Items]
Percentage of management fee				3.00%
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	100,000	100,000
Shulman Rogers LLP [Member] \| Maximum [Member] \| Samuel M. Spiritos [Member]
Related Party Transaction [Line Items]
Related party legal fees \| $		200,000	$ 100,000	200,000	$ 100,000
Other Assets, Net [Member] \| Maximum [Member]
Related Party Transaction [Line Items]
Receivables due from related parties \| $		100,000		100,000
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 \| $						$ 700,000
Payables Due to Related Parties [Member] \| Due to Properties Managed by Company [Member] \| Borrowed by Company for Working Capital [Member] \| Maximum [Member]
Related Party Transaction [Line Items]
Payables due to related parties \| $		100,000		100,000
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 \| $							$ 1,000,000.0
Consideration payable in exchange for repurchasing ownership interest \| $		$ 500,000		$ 500,000