Note 13 - Related Party Transactions - (Details Textual) - USD ($)				3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 01, 2022	Dec. 21, 2021	Dec. 27, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Receivables due from related parties				$ 300,000		$ 300,000		$ 100,000
Revenue from related parties					$ 300,000	$ 400,000	$ 1,100,000
Percentage of management fee						3.00%
Ground lease revenues				7,931,000	7,007,000	$ 23,626,000	17,623,000
BBL Property [Member] | Midtown Row [Member]
Related Party Transaction [Line Items]
Revised acquisition amount to be paid	$ 123,300,000
Related Party Transaction, Purchases from Related Party		$ 122,000,000.0
BBL Property [Member] | Midtown Row [Member] | Preferred Op Units [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	5,000,000.0
BBL Property [Member] | Midtown Row [Member] | Common Op Units [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	$ 5,000,000.0
Thomas M. Yockey [Member] | Broad Street Entities [Member] | Common Stock [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
OP units			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]
OP units			420,523
Michael Z. Jacoby [Member] | Broad Street Entities [Member] | Common Stock [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
OP units			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]
OP units			856,805
Alexander Topchy [Member] | Broad Street Entities [Member] | Common Stock [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
OP units			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]
OP units			48,320
Daniel J.W. Neal [Member] | Broad Street Entities [Member] | Common Stock [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
OP units			878,170
Samuel M. Spiritos [Member] | Broad Street Entities [Member] | Common Stock [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
OP units			13,827
Maximum [Member] | Cromwell Field Shopping Center [Member]
Related Party Transaction [Line Items]
Ground lease revenues							100,000
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
Timbergate Ventures, LLC [Member] | Thomas M. Yockey [Member]
Related Party Transaction [Line Items]
Related party consulting agreement term								2 years
Related party consulting fees					50,000	200,000	200
Related Party Consulting Agreement Expiration Term								Dec. 26, 2021
Shulman Rogers LLP [Member] | Maximum [Member] | Samuel M. Spiritos [Member]
Related Party Transaction [Line Items]
Related party legal fees				100,000	$ 100,000	300,000	$ 300,000
Other Assets, Net [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Receivables due from related parties				400,000		400,000		$ 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				$ 1,000,000.0		$ 1,000,000.0		$ 600,000