Note 7 - Mortgage and Other Indebtedness (Details Textual)								1 Months Ended		12 Months Ended
		Jul. 02, 2020 USD ($)	Jun. 16, 2020 USD ($) Capital	Apr. 20, 2020 USD ($)	Dec. 31, 2019 USD ($)		Dec. 27, 2019 USD ($) Subsidiary Derivative	Dec. 31, 2020 USD ($)	Oct. 31, 2015 USD ($)	Dec. 31, 2019 USD ($)		Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Long-term debt outstanding					$ 115,122,000					$ 115,122,000
Interest Rate												5.25%
Preferred investor approval rights, Minimum amount of capital expenditure to be incurred							$ 250,000
Deferred financing costs, gross					1,300,000					1,300,000
Deferred financing costs, net					$ 1,300,000					1,300,000
Expenses related to fair value adjustments on derivatives										$ 100,000
Derivative financial instruments												$ 0
2020 Real Estate Acquisitions [Member] | Lamar Station Plaza East [Member] | Loan Agreement [Member]
Debt Instrument [Line Items]
Debt instrument payment terms										Upon assumption of the loan agreement, the Company was in default of the debt service coverage ratio (as defined in the loan agreement) as of December 31, 2019 and June 30, 2020 and had not cured the default by making a principal payment within sixty days in a manner sufficient to reduce the outstanding loan amount in order to satisfy the covenant test.
Subsequent Event [Member]
Debt Instrument [Line Items]
PPP loan, interest rate				1.00%
PPP loan payment term				24 months
PPP loan monthly payment				$ 32,032
PPP loan maturity date				Oct. 20, 2022
Subsequent Event [Member] | 2020 Real Estate Acquisitions [Member] | Lamar Station Plaza East [Member]
Debt Instrument [Line Items]
Assumption of debt		$ 2,500,000
Subsequent Event [Member] | 2020 Real Estate Acquisitions [Member] | Lamar Station Plaza East [Member] | Loan Agreement [Member]
Debt Instrument [Line Items]
Maximum principal amount		$ 4,100,000
MVB Revolver [Member]
Debt Instrument [Line Items]
Maturity Date	[1]									Dec. 27, 2020
Interest Rate	[2]				6.75%					6.75%
Mortgages [Member]
Debt Instrument [Line Items]
Outstanding mortgage indebtedness										$ 32,100,000
PPP Loan [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Unsecured loan				$ 800,000
Sub-OP [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Number of additional capital contribution from preferred investor | Capital			2
Preferred investor, additional capital contribution, treated as debt			$ 2,900,000
LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate												4.00%
LIBOR [Member] | MVB Revolver [Member]
Debt Instrument [Line Items]
Debt instrument variable rate										1.76%
Prime Rate [Member] | MVB Revolver [Member]
Debt Instrument [Line Items]
Debt instrument variable rate										1.50%
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Fair value of interest rate swap liability					$ 100,000					$ 100,000
Interest Rate Swap [Member] | Accounts Payable and Accrued Liabilities [Member]
Debt Instrument [Line Items]
Fair value of interest rate swap liability					100,000					100,000
Maximum [Member]
Debt Instrument [Line Items]
Deferred financing costs, amortization expense					100,000					100,000		$ 100,000
Maximum [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Fair value of interest rate cap assets					100,000					100,000
Maximum [Member] | Interest Rate Cap [Member] | Other Assets, Net [Member]
Debt Instrument [Line Items]
Fair value of interest rate cap assets					100,000					100,000
Basis Term Loan [Member]
Debt Instrument [Line Items]
Number of subsidiaries as borrowers entered in loan agreement | Subsidiary							6
Long-term debt outstanding					$ 63,800,000					$ 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.
Interest Rate					6.125%	[2]	6.125%			6.125%	[2]
Preferred investor, additional capital contribution, treated as debt					$ 2,900,000					$ 2,900,000
Basis Term Loan [Member] | Sub-OP [Member]
Debt Instrument [Line Items]
Preferred units remaining contributed capital					$ 1,200,000					$ 1,200,000
Basis Term Loan [Member] | Sub-OP [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Preferred investor, additional capital contribution, treated as debt			2,400,000
Basis Term Loan [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate							3.85%			3.85%
Basis Term Loan [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Long-term debt amount							$ 66,900,000
Debt instrument variable rate							6.125%
Basis Term Loan [Member] | Interest Rate Cap [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate							3.85%			3.50%
Derivative variable rate							3.50%
Debt instrument, effective interest rate							3.50%
Basis Term Loan [Member] | Maximum [Member]
Debt Instrument [Line Items]
Long-term debt amount							$ 66,900,000
Basis Preferred Interest [Member]
Debt Instrument [Line Items]
Maturity Date	[3],[4]									Jan. 01, 2023
Interest Rate	[2],[4]				14.00%					14.00%
Basis Preferred Interest [Member] | Sub-OP [Member]
Debt Instrument [Line Items]
Preferred investor investment commitment amount							$ 10,700,000
Preferred investor, capital contribution										$ 6,900,000
Annual return percentage on initial capital contribution							14.00%
Interest percentage on excess of commitment amount							20.00%
Description on extended redemption date										December 31, 2023 and December 31, 2024
Payment fee percentage, first extension option							0.25%
Payment fee percentage, second extension option							0.50%
Preferred Investor payments, description										Additionally, at the Redemption Date, the Preferred Investor is entitled to an amount equal to (a) the product of (i) the aggregate amount of capital contributions made and (ii) 0.4, less (b) the aggregate amount of Class A return payments made to the Preferred Investor (the “Minimum Multiple Amount”).
Basis Preferred Interest [Member] | Sub-OP [Member] | Class A Units [Member]
Debt Instrument [Line Items]
Interest percentage in exchange of capital contribution										1.00%
Basis Preferred Interest [Member] | Maximum [Member]
Debt Instrument [Line Items]
Preferred investor investment commitment amount							$ 10,700,000
Basis Preferred Interest Minimum Multiple Amount [Member]
Debt Instrument [Line Items]
Long-term debt outstanding					$ 2,800,000					$ 2,800,000
Basis Preferred Interest Minimum Multiple Amount [Member] | Sub-OP [Member]
Debt Instrument [Line Items]
Long-term debt outstanding					$ 2,800,000					2,800,000
MVB Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term debt outstanding							6,500,000
Loan agreement deposit requirement										$ 3,000,000
Loan agreement deposit requirement default interest charges percentage										1.00%
MVB Loan Agreement [Member] | MVB Revolver [Member]
Debt Instrument [Line Items]
Long-term debt outstanding							$ 2,000,000
Maturity Date					Dec. 27, 2021		Dec. 27, 2020
Interest Rate					6.75%					6.75%
MVB Loan Agreement [Member] | MVB Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt outstanding							$ 4,500,000
Maturity Date							Dec. 27, 2022
Interest Rate							6.75%
MVB Loan Agreement [Member] | MVB Term Loan [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Line of credit facility, periodic payment required								$ 250,000,000
MVB Loan Agreement [Member] | Prime Rate [Member] | MVB Revolver [Member]
Debt Instrument [Line Items]
Debt instrument variable rate							1.50%
MVB Loan Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt service coverage ratio					1.30%					1.30%
Consolidated funded debt ratio										8.00%
MVB Loan Agreement [Member] | Maximum [Member] | MVB Term Loan [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt service coverage ratio								1.00%
MVB Loan Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt service coverage ratio					1.00%					1.00%
Funds available under other lines of credit										$ 5,000,000
MVB Loan Agreement [Member] | Minimum [Member] | MVB Term Loan [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt service coverage ratio								1.00%
Funds available under other lines of credit								$ 3,000,000
Hollinswood Loan [Member]
Debt Instrument [Line Items]
Maturity date description										The deferred amounts for the Hollinswood mortgage loan are due in six equal monthly installments beginning in November 2020.
Hollinswood Loan [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt service coverage ratio					1.40%					1.40%
Hollinswood Loan [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt service coverage ratio					1.00%					1.00%
Vista Mortgage [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt service coverage ratio					1.35%					1.35%
Vista Mortgage [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt service coverage ratio					1.00%					1.00%
Brookhill Mortgage [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt service coverage ratio					1.35%					1.35%
Brookhill Mortgage [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt service coverage ratio					1.00%					1.00%
Other Capital Contribution [Member] | Sub-OP [Member]
Debt Instrument [Line Items]
Preferred units remaining contributed capital					$ 200,000					$ 200,000
Other Capital Contribution [Member] | Sub-OP [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Preferred investor, additional capital contribution, treated as debt			$ 500,000
Preferred units, cumulative annual return			13.00%
Hollinswood Loan [Member]
Debt Instrument [Line Items]
Maturity Date										Dec. 01, 2024
Interest Rate	[2]				4.06%					4.06%
Hollinswood Loan [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument variable rate										2.25%
Hollinswood Loan [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Debt instrument variable rate							4.06%
Hollinswood Loan [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Long-term debt outstanding							$ 10,200,000
Interest Rate					4.06%					4.06%
Number of derivatives held | Derivative							2
Debt instrument additional borrowing available							$ 3,000,000
EagleBank Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term debt amount													$ 3,250,000
EagleBank Loan Agreement [Member] | Michael Jacoby and Thomas Yockey [Member]
Debt Instrument [Line Items]
Line of credit facility, maturity period									1 year
Line of credit facility, remaining borrowing capacity												$ 0
EagleBank Loan Agreement [Member] | Michael Jacoby and Thomas Yockey [Member] | Sub Note
Debt Instrument [Line Items]
Interest Rate												7.00%
Line of credit facility, maturity date												Apr. 30, 2019
Line of credit facility, maturity period									9 months
Line of credit outstanding												$ 700,000
EagleBank Loan Agreement [Member] | Accounts Receivable Line of Credit [Member]
Debt Instrument [Line Items]
Long-term debt amount													$ 1,250,000
Interest Rate												6.50%	5.25%
Maximum principal amount													$ 1,250,000
Line of credit facility, maturity date													Apr. 30, 2019
Line of credit advanced in full												$ 1,250,000
EagleBank Loan Agreement [Member] | Working Capital Line of Credit [Member]
Debt Instrument [Line Items]
Long-term debt amount													$ 750,000
Interest Rate												6.50%	5.25%
Maximum principal amount													$ 750,000
Line of credit facility, maturity date													Apr. 01, 2019
Line of credit advanced in full													$ 750,000
EagleBank Loan Agreement [Member] | Acquisition Line of Credit [Member]
Debt Instrument [Line Items]
Long-term debt amount													1,000,000
Long-term debt outstanding													$ 1,000,000
Maturity Date													Apr. 30, 2019
Interest Rate												6.50%	5.25%
EagleBank Loan Agreement [Member] | Revolving Line of Credit [Member] | Michael Jacoby and Thomas Yockey [Member]
Debt Instrument [Line Items]
Maximum principal amount									$ 2,000,000
EagleBank Loan Agreement [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt amount													$ 1,250,000
EagleBank Loan Agreement [Member] | $1.25 million Term Loan [Member]
Debt Instrument [Line Items]
Maturity Date													Dec. 31, 2022
Interest Rate												5.25%
Term loan advanced in full													$ 1,250,000
Principal payments													200,000
Single curtailment payment													$ 500,000
Reduced percentage interest payment on loan due to curtailment													5.00%
EagleBank Loan Agreement [Member] | LIBOR [Member] | Accounts Receivable Line of Credit [Member]
Debt Instrument [Line Items]
Debt instrument variable rate													4.00%
EagleBank Loan Agreement [Member] | LIBOR [Member] | Working Capital Line of Credit [Member]
Debt Instrument [Line Items]
Debt instrument variable rate													4.00%
EagleBank Loan Agreement [Member] | LIBOR [Member] | Acquisition Line of Credit [Member]
Debt Instrument [Line Items]
Debt instrument variable rate													4.00%
EagleBank Loan Agreement [Member] | 5.5% [Member] | $1.25 million Term Loan [Member]
Debt Instrument [Line Items]
Interest Rate													5.50%
EagleBank Loan Agreement [Member] | 5.25% [Member] | $1.25 million Term Loan [Member]
Debt Instrument [Line Items]
Interest Rate													5.25%
EagleBank Loan Agreement [Member] | Maximum [Member] | Accounts Receivable Line of Credit [Member]
Debt Instrument [Line Items]
Interest Rate													80.00%
EagleBank Loan Agreement [Member] | Maximum [Member] | 5.25% [Member] | $1.25 million Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt outstanding													$ 101,000
EagleBank Loan Agreement [Member] | Minimum [Member] | 5.5% [Member] | $1.25 million Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt outstanding												$ 1,000,000	$ 1,010,000

[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”.

[2] For floating rate loans tied to LIBOR, based on the one-month LIBOR rate of 1.76%, as of December 31, 2019.

[3] If the Basis Term Loan is paid in full earlier than its maturity date, the Basis Preferred Interest in the Sub-OP (as defined below) will mature at that time.

[4] The outstanding balance includes approximately $2.8 million of indebtedness related to the Multiple Minimum Amount owed to the Preferred Investor as described below under the heading “—Basis Preferred Interest”.