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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Dexter) (Details)		1 Months Ended	3 Months Ended
	Oct. 28, 2009 USD ($) item	Feb. 28, 2007 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 27, 2018 USD ($)	Mar. 22, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($) item	Mar. 01, 2017 USD ($)	Oct. 03, 2005 USD ($) item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Investments in joint venture				$ 6,986,470			$ 7,212,044	$ 9,955,145
Number of units | item								1,033
Outstanding amount of mortgage				253,584,894			$ 233,221,258
Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Investments in joint venture	$ 15,925,000							$ 3,300,098
Ownership interest (as a percent)	40.00%							40.00%
Number of units | item	409							409
Purchase price of investments	$ 129,500,000
Dexter Park | Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)	5.57%
Period for which the entity is required to make interest only payments	2 years
Amortization period of debt	30 years
Outstanding amount of mortgage				$ 81,601,000
Borrowings	$ 89,914,000
Hamilton Bay Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Investments in joint venture								$ 2,956,030		$ 2,500,000
Ownership interest (as a percent)								50.00%		50.00%
Number of units | item								48		168
Interest rate (as a percent)		5.57%
Period for which the entity is required to make interest only payments		5 years
Amortization period of debt		30 years
Purchase price of investments										$ 30,875,000
Borrowings		$ 4,750,000
Hamilton Bay Apts | Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Outstanding amount of mortgage									$ 2,222,000
John Hancock | Hamilton Bay Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)						3.99%
Outstanding amount of mortgage						$ 82,000,000
Rate lock confirmation deposit					$ 1,290,000	1,290,000
Loan amount						$ 125,000,000
Forecast | John Hancock | Hamilton Bay Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Defeasance cost			$ 3,750,000
Defeasance cost (as a percent)			40.00%
General Partnership | Forecast | John Hancock | Hamilton Bay Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Defeasance cost			$ 1,500,000
Residential buildings
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units | item								1,030
Residential buildings | Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units | item								409
Residential buildings | Hamilton Bay Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units | item								48

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Represents the percentage of debt extinguishment costs to be paid

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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