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RELATED PARTY TRANSACTIONS (Details)	3 Months Ended		6 Months Ended		18 Months Ended
	Mar. 31, 2018 USD ($) item	Mar. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Sep. 29, 2017 USD ($)	Jul. 06, 2017 USD ($)
RELATED PARTY TRANSACTIONS
Management fee as percentage of gross receipts rental revenue	4.00%
Management fee as a percentage of gross receipts rental revenue of Linewt, LLC	3.00%
Management fees of related party	$ 560,000	$ 537,000
Management fee	559,629	536,715
Repairs and maintenance	1,814,283	1,455,621
Administrative expense	$ 539,145	525,736
Number of limited partnerships and limited liability companies in which the entity has invested | item	8
Interest expense	$ 2,984,210	2,520,826
Woodland Park Apartments LLC Newton Massachusetts
RELATED PARTY TRANSACTIONS
Loan amount						$ 22,250,000	$ 16,000,000
Interest rate (as a percent)						3.79%	4.75%
Dexter Park
RELATED PARTY TRANSACTIONS
Management fee as percentage of gross receipts rental revenue	2.00%
President of Management Company
RELATED PARTY TRANSACTIONS
Quarterly fee for asset management consulting services			$ 18,750	$ 18,750
Harold Brown | Minimum
RELATED PARTY TRANSACTIONS
Ownership interest (as a percent)	43.20%
Harold Brown | Maximum
RELATED PARTY TRANSACTIONS
Ownership interest (as a percent)	56.00%
General Partner or Management Company [Member]
RELATED PARTY TRANSACTIONS
Repairs and maintenance	$ 82,000
Administrative expense	84,000
Commercial brokerage fees	20,000
Expenses for construction, architectural services and supervision of capital projects	168,000
Costs related to professional services	354,000	182,000
Management Company [Member]
RELATED PARTY TRANSACTIONS
Reimbursement to related party for payroll transfers	$ 824,000	$ 811,000
Employer contributions in 401K plan			0	0
Number of accounting staff of related party providing bookkeeping and accounting functions | item	14
Fees for accounting and bookkeeping services			$ 31,250	$ 31,250
Number of employees having ownership interest in the investment properties | item	6
Fees for accounting and bookkeeping services per year					$ 125,000
Partially owned properties
RELATED PARTY TRANSACTIONS
Management fee as percentage of gross receipts rental revenue	4.00%
Management fee	$ 160,000
Repairs and maintenance	23,000
Administrative expense	20,000
Construction, architectural services and supervision of capital projects	40,000
Amount paid to related party	$ 243,000
Residential and mixed-use properties | Partially owned properties | Minimum
RELATED PARTY TRANSACTIONS
Ownership interest (as a percent)	40.00%
Residential and mixed-use properties | Partially owned properties | Maximum
RELATED PARTY TRANSACTIONS
Ownership interest (as a percent)	50.00%

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