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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Hamilton Bay Apts and Sales) (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2007 item	Mar. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($) item	Mar. 31, 2017 USD ($) item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Investments in joint venture | $		$ 6,986,470	$ 7,212,044	$ 9,955,145
Number of units				1,033
Number of units sold				264
Number of units retained for long-term investment				(690)
Outstanding amount of mortgage | $		$ 253,584,894	$ 233,221,258
Unsold units				79
Hamilton Bay Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units sold			29
Number of units refinanced	48
Gain on the sale of real estate | $			$ 3,628,000
Hamilton Bay Sales
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units		13
Number of units sold		6
Number of units under a purchase and sale agreement		5
Gain on the sale of real estate | $		$ 828,000
Residential buildings
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units				1,030
Mortgages payable | Minimum
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)		3.61%
Mortgages payable | Maximum
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)		5.81%

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The number of units in a real estate property refinanced.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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