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Note 16 - Related Party Transactions - (Details Textual) $ in Millions		12 Months Ended
	Dec. 27, 2020 Merger shares	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($)	Jan. 31, 2020 USD ($)
Related Party Transaction [Line Items]
Receivables due from related parties \| $		$ 0.3	$ 0.2
Revenue from related parties \| $		$ 2.8	3.1
Number of properties to be acquired \| property		7
BBL Property [Member]
Related Party Transaction [Line Items]
Ownership interest percentage		0.00%
Messrs. Jacoby and Yockey, Mr. Topchy, Jeffrey H. Foster and Aras Holden [Member]
Related Party Transaction [Line Items]
Ownership interest percentage		20.90%
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%
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 fees \| $		$ 0.2
Related party consulting agreement term		2 years
Shulman Rogers LLP [Member] \| Samuel M. Spiritos [Member]
Related Party Transaction [Line Items]
Related party legal fees \| $		$ 0.5
Other Assets, Net [Member]
Related Party Transaction [Line Items]
Receivables due from related parties \| $			1.2
Other Assets, Net [Member] \| Due from a Member [Member]
Related Party Transaction [Line Items]
Receivables due from related parties \| $			1.0
Other Assets, Net [Member] \| Due from Properties Managed by Company [Member]
Related Party Transaction [Line Items]
Receivables due from related parties \| $		0.5	0.2
Payables Due to Related Parties [Member]
Related Party Transaction [Line Items]
Payables due to related parties \| $			2.2
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 \| $		1.1	2.1
Payables Due to Related Parties [Member] \| Due to an Entity Owned by Former Members [Member]
Related Party Transaction [Line Items]
Payables due to related parties \| $			$ 0.1
Accounts Payable and Accrued Liabilities [Member] \| BSR [Member] \| Thomas M. Yockey [Member]
Related Party Transaction [Line Items]
Consideration to be paid in exchange for repurchasing ownership interest \| $		$ 1.5
Accounts Payable and Accrued Liabilities [Member] \| BSR [Member] \| Thomas M. Yockey [Member] \| Subsequent Event [Member]
Related Party Transaction [Line Items]
Consideration paid in exchange for repurchasing ownership interest \| $				$ 1.0