Note 1 - Organization and Nature of Business (Details Textual)						1 Months Ended		12 Months Ended
		Dec. 27, 2020 shares	Dec. 11, 2020 USD ($)	Jul. 02, 2020 USD ($) Merger shares	Dec. 27, 2019 Merger	Nov. 30, 2020 USD ($)	Apr. 30, 2020	Dec. 31, 2019 USD ($) property Entity Merger MortgageLoan shares	Dec. 31, 2018 USD ($)	Apr. 20, 2020 USD ($)	May 28, 2019 Merger
Real Estate Properties [Line Items]
Real estate investments								$ 173,544,000
Number of real estate properties | property								10
Long-term debt outstanding								$ 115,122,000
Mortgages with principal balances outstanding								11,900,000
Repayment of debt								4,668,000	$ 522,000
Remaining availability from preferred capital contributions								$ 1,400,000
Number of mortgage properties | property								2
Cash and cash equivalents								$ 9,068,000	$ 138,000
Restricted cash								$ 2,527,000
Hollinswood Loan [Member]
Real Estate Properties [Line Items]
Maturity date								Dec. 01, 2024
Vista Shops at Golden Mile Loan [Member]
Real Estate Properties [Line Items]
Maturity date								Jan. 25, 2021
Hollinswood Loan [Member]
Real Estate Properties [Line Items]
Maturity date description								The deferred amounts for the Hollinswood mortgage loan are due in six equal monthly installments beginning in November 2020.
Brookhill Azalea Shopping Center Loan [Member]
Real Estate Properties [Line Items]
Maturity date								Jan. 31, 2025
Avondale Shops Loan [Member]
Real Estate Properties [Line Items]
Maturity date								Jun. 01, 2025
MVB Term Loan [Member]
Real Estate Properties [Line Items]
Maturity date								Dec. 27, 2022
Basis Term Loan [Member]
Real Estate Properties [Line Items]
Long-term debt outstanding								$ 63,800,000
Maturity date					Jan. 01, 2023			Jan. 01, 2023
Maturity date description								The Basis Term Loan matures on January 1, 2023, subject to two one-year extension options, subject to certain conditions.
Preferred investor, additional capital contribution, treated as debt								$ 2,900,000
MVB Revolver [Member]
Real Estate Properties [Line Items]
Maturity date	[1]							Dec. 27, 2020
COVID-19 [Member]
Real Estate Properties [Line Items]
Number of mergers delayed in closing | Merger								6
Event of default								has been unable to meet and anticipates being unable to meet certain debt covenants included in the Company’s loan agreements, and has certain debt maturities occurring within the next twelve months.
Number of mortgage loans | MortgageLoan								2
Repayment of debt								$ 250,000,000
COVID-19 [Member] | Hollinswood Loan [Member]
Real Estate Properties [Line Items]
Debt instrument term defer payments of principal and interest.								6 months
COVID-19 [Member] | Vista Shops at Golden Mile Loan [Member]
Real Estate Properties [Line Items]
Debt instrument term defer payments of principal and interest.								6 months
COVID-19 [Member] | Hollinswood Loan [Member]
Real Estate Properties [Line Items]
Maturity date description								The deferred amount for the Hollinswood mortgage is due in six equal monthly installments beginning November 2020
COVID-19 [Member] | Brookhill Azalea Shopping Center Loan [Member]
Real Estate Properties [Line Items]
Debt instrument term defer payments of principal and interest.								3 months
COVID-19 [Member] | Avondale Shops Loan [Member]
Real Estate Properties [Line Items]
Debt instrument term defer payments of principal and interest.								4 months
COVID-19 [Member] | MVB Term Loan [Member]
Real Estate Properties [Line Items]
Debt instrument term defer payments of principal and interest.								3 months
COVID-19 [Member] | April through November 2020 [Member]
Real Estate Properties [Line Items]
Deferred contractual revenue								$ 300,000
Deferred contractual revenue waived								$ 300,000
COVID-19 [Member] | MVB Term Loan [Member]
Real Estate Properties [Line Items]
Maturity date								Dec. 27, 2021
COVID-19 [Member] | Next Twelve Months [Member]
Real Estate Properties [Line Items]
Mortgages with principal balances outstanding								$ 11,900,000
COVID-19 [Member] | MVB Revolver [Member]
Real Estate Properties [Line Items]
Long-term debt outstanding								$ 2,000
Maturity date								Dec. 27, 2020
COVID-19 [Member] | MVB Revolver [Member] | 2020 Forbearance Agreements and Debt Amendments [Member]
Real Estate Properties [Line Items]
Long-term debt outstanding								$ 2,000,000
Maturity date								Dec. 27, 2021
Subsequent Event [Member]
Real Estate Properties [Line Items]
Cash and cash equivalents						$ 3,000,000
Restricted cash						$ 3,800,000
Subsequent Event [Member] | PPP Loan [Member]
Real Estate Properties [Line Items]
Unsecured loan										$ 800,000
Subsequent Event [Member] | COVID-19 [Member]
Real Estate Properties [Line Items]
Percentage of contractual rent collected from tenants						94.00%	79.00%
Deferred contractual revenue			$ 300,000
Deferred contractual revenue waived			$ 300,000
Subsequent Event [Member] | COVID-19 [Member] | PPP Loan [Member]
Real Estate Properties [Line Items]
Unsecured loan										$ 800,000
MedAmerica [Member]
Real Estate Properties [Line Items]
Number of merger agreements | Merger											19
Date of merger					Dec. 27, 2019
Number of merger completed | Merger					11
Number of merger not yet completed | Merger								6
MedAmerica [Member] | Common Stock [Member]
Real Estate Properties [Line Items]
Equity interest issued as consideration for the mergers | shares								10,400,779
MedAmerica [Member] | OP units [Member]
Real Estate Properties [Line Items]
Equity interest issued as consideration for the mergers | shares								573,529
MedAmerica [Member] | Brookhill Azalea Shopping Center [Member]
Real Estate Properties [Line Items]
Number of additional merger | Merger								1
Cash portion of consideration for initial mergers								$ 900,000
MedAmerica [Member] | Brookhill Azalea Shopping Center [Member] | Common Stock [Member]
Real Estate Properties [Line Items]
Equity interest issued as consideration for the mergers | shares								18,776,768
MedAmerica [Member] | Brookhill Azalea Shopping Center [Member] | OP units [Member]
Real Estate Properties [Line Items]
Equity interest issued as consideration for the mergers | shares								2,827,904
MedAmerica [Member] | Lamar Station Plaza East and Cromwell Field Shopping Center [Member] | Subsequent Event [Member]
Real Estate Properties [Line Items]
Cash portion of consideration for initial mergers				$ 200,000
Number of merger closed | Merger				1
MedAmerica [Member] | Lamar Station Plaza East and Cromwell Field Shopping Center [Member] | Common Stock [Member] | Subsequent Event [Member]
Real Estate Properties [Line Items]
Equity interest issued as consideration for the mergers | shares				884,143
2020 Real Estate Acquisitions [Member] | Lamar Station Plaza East [Member] | COVID-19 [Member] | 2020 Forbearance Agreements and Debt Amendments [Member]
Real Estate Properties [Line Items]
Closing date of merger property								2020-07
Broad Street Entities [Member] | MedAmerica [Member]
Real Estate Properties [Line Items]
Number of merger completed | Merger					9
BSR [Member]
Real Estate Properties [Line Items]
Number of real estate properties | property								0
BSR [Member] | Broad Street Entities [Member]
Real Estate Properties [Line Items]
Number of entities that own properties acquired | Entity								17
Michael Z. Jacoby [Member] | Broad Street Entities [Member] | Common Stock [Member]
Real Estate Properties [Line Items]
Equity interest issued as consideration for the mergers | shares		2,004,146
Michael Z. Jacoby [Member] | Broad Street Entities [Member] | OP units [Member]
Real Estate Properties [Line Items]
Equity interest issued as consideration for the mergers | shares		856,805
Michael Z. Jacoby [Member] | BSR [Member]
Real Estate Properties [Line Items]
Ownership percentage								50.00%
Thomas M. Yockey [Member] | Broad Street Entities [Member] | Common Stock [Member]
Real Estate Properties [Line Items]
Equity interest issued as consideration for the mergers | shares		2,004,146
Thomas M. Yockey [Member] | Broad Street Entities [Member] | OP units [Member]
Real Estate Properties [Line Items]
Equity interest issued as consideration for the mergers | shares		420,523
Thomas M. Yockey [Member] | BSR [Member]
Real Estate Properties [Line Items]
Ownership percentage								50.00%
Operating Partnership [Member]
Real Estate Properties [Line Items]
Operating partnership percentage								88.40%

[1] In December 2020, the Company entered into a one-year extension on the MVB Revolver as described below under the heading “—2020 Forbearance Agreements and Debt Amendments”.