Note 15 - Related Party Transactions - (Details Textual) $ in Thousands			12 Months Ended
	Dec. 21, 2021 USD ($)	Dec. 27, 2020 Merger shares	Dec. 31, 2021 USD ($) Property	Dec. 31, 2020 USD ($) Property	Jun. 30, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Receivables due from related parties | $			$ 100	$ 500
Revenue from related parties | $			$ 1,200	$ 1,600
Number of properties to be acquired | Property			2	6
Ground lease revenues | $			$ 25,349	$ 19,659
Cromwell Field Shopping Center [Member]
Related Party Transaction [Line Items]
Ground lease revenues | $				100
BBL Property [Member] | Midtown Row [Member]
Related Party Transaction [Line Items]
Ownership interest percentage			0.00%
Purchase price | $	$ 122,000
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
Broad Street Entities [Member]
Related Party Transaction [Line Items]
Number of Mergers Remaining | Merger		2
Thomas M. Yockey [Member] | Broad Street Entities [Member] | Common Stock [Member]
Related Party Transaction [Line Items]
Remaining equity interest to be issued as consideration for the mergers		17,985
Thomas M. Yockey [Member] | Broad Street Entities [Member] | Common Stock [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers		2,533,650
Thomas M. Yockey [Member] | Broad Street Entities [Member] | OP units [Member]
Related Party Transaction [Line Items]
Remaining equity interest to be issued as consideration for the mergers		136,213
Thomas M. Yockey [Member] | Broad Street Entities [Member] | OP units [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers		420,523
Michael Z. Jacoby [Member] | Broad Street Entities [Member] | Common Stock [Member]
Related Party Transaction [Line Items]
Remaining equity interest to be issued as consideration for the mergers		17,985
Michael Z. Jacoby [Member] | Broad Street Entities [Member] | Common Stock [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers		2,533,650
Michael Z. Jacoby [Member] | Broad Street Entities [Member] | OP units [Member]
Related Party Transaction [Line Items]
Remaining equity interest to be issued as consideration for the mergers		136,213
Michael Z. Jacoby [Member] | Broad Street Entities [Member] | OP units [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers		856,805
Alexander Topchy [Member] | Broad Street Entities [Member] | Common Stock [Member]
Related Party Transaction [Line Items]
Remaining equity interest to be issued as consideration for the mergers		1,934
Alexander Topchy [Member] | Broad Street Entities [Member] | Common Stock [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers		137,345
Alexander Topchy [Member] | Broad Street Entities [Member] | OP units [Member]
Related Party Transaction [Line Items]
Remaining equity interest to be issued as consideration for the mergers		14,338
Alexander Topchy [Member] | Broad Street Entities [Member] | OP units [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers		48,320
Daniel J.W. Neal [Member] | Broad Street Entities [Member] | Common Stock [Member]
Related Party Transaction [Line Items]
Remaining equity interest to be issued as consideration for the mergers		16,450
Daniel J.W. Neal [Member] | Broad Street Entities [Member] | Common Stock [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers		878,170
Spiritos [Member] | Broad Street Entities [Member] | Common Stock [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
Equity interest issued as consideration for the mergers		13,827
BSR [Member] | Thomas M. Yockey [Member]
Related Party Transaction [Line Items]
Consideration to be paid in exchange for repurchasing ownership interest | $							$ 1,500
Consideration paid in exchange for repurchasing ownership interest | $					$ 500	$ 1,000
Timbergate Ventures, LLC [Member] | Thomas M. Yockey [Member]
Related Party Transaction [Line Items]
Related party consulting fees | $			$ 200
Related party consulting agreement term			2 years
Related party consulting agreement expiration term			Dec. 26, 2021
Shulman Rogers LLP [Member] | Spiritos [Member]
Related Party Transaction [Line Items]
Related party legal fees | $			$ 500	100
Other Assets, Net [Member]
Related Party Transaction [Line Items]
Receivables due from related parties | $			200	200
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 | $			$ 600	$ 700