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MORTGAGE NOTES PAYABLE (Line of Credit) (Details)					12 Months Ended
	Dec. 03, 2021 USD ($)	Oct. 29, 2021 USD ($)	Sep. 30, 2015 USD ($)	Jul. 31, 2014 USD ($)	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	May 31, 2019 USD ($)
Line of Credit
Interest expense					$ 13,629,463	$ 13,705,415	$ 12,201,966
Credit line balance					0	17,000,000
Hamilton Essex 81
Line of Credit
Term of debt			10 years
Loan amount			$ 10,000,000
Interest expense					246,339	$ 299,161	$ 466,737
Residences at CaptainParkers LLC Residential Apartments Lexington, Massachusetts
Line of Credit
Loan amount								$ 20,750,000
LIBOR | Hamilton Essex 81
Line of Credit
Variable interest rate spread			2.18%
Line of Credit
Line of Credit
Maximum borrowings		$ 25,000,000
Maximum borrowings during modification period		$ 17,000,000
Term of debt		3 years		3 years
Loan amount				$ 25,000,000
Payment on line of credit	$ 17,000,000
Amount of refinancing costs				$ 128,000
Extension fees paid					$ 37,500
Modification and renewal of the line of credit		$ 179,000
Number of properties in which borrowing amount collateralized | item					23
Commitment fee					$ 10,000
Debt yield					8.04%	8.50%
Line of Credit | Current covenants
Line of Credit
Leverage ratio		65.00%
Tangible net worth		$ 200
Debt yield		9.50%
Debt service coverage ratio		1.60
Line of Credit | Revised covenants inplace until September 30, 2022
Line of Credit
Leverage ratio		70.00%
Tangible net worth		$ 175
Debt yield		8.50%
Debt service coverage ratio		1.35
Line of Credit | Revised Covenants in place until December 31, 2022
Line of Credit
Debt yield		9.00%
Line of Credit | Federal Funds Rate
Line of Credit
Variable interest rate spread				0.005%
Line of Credit | LIBOR
Line of Credit
Additional applicable margin rate				2.50%
Variable interest rate spread		300.00%		1.00%
Line of Credit | Minimum
Line of Credit
Pledged interest ownership percentage					49.00%
Commitment fee for unused amount (as a percent)					0.15%
Line of Credit | Maximum
Line of Credit
Pledged interest ownership percentage					100.00%
Commitment fee for unused amount (as a percent)					0.20%
Residences at CaptainParkers LLC Residential Apartments Lexington, Massachusetts
Line of Credit
Loan amount								$ 20,750,000

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Represents that additional interest rate margin on a debt instrument.

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Represents the ratio of consolidated adjusted earnings before interest, taxes, depreciation and amortization to interest expense, which is necessary to be maintained under the terms of the senior credit facilities' covenants.

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Line of credit facility extension fees paid.

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Maximum borrowing capacity during the modifications period under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of the fee for available but unused credit capacity under the credit facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The number of real estate properties owned as of the balance sheet date.

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