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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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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details)									1 Months Ended						3 Months Ended		12 Months Ended
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details)	Sep. 12, 2016 USD ($)	Jul. 08, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 28, 2015 USD ($)	Oct. 18, 2013 USD ($)	Oct. 28, 2009 USD ($) item	Mar. 07, 2005 USD ($) item	Mar. 02, 2005 USD ($) item	Aug. 31, 2014 USD ($)	Jun. 30, 2013 USD ($)	Apr. 30, 2008 USD ($) item	Feb. 28, 2007 USD ($)	Jan. 31, 2007 USD ($)	Oct. 31, 2004 USD ($)	Mar. 31, 2017 USD ($) property item	Mar. 31, 2016 USD ($) property	Dec. 31, 2016 USD ($) property item	Dec. 31, 2005 USD ($)	Mar. 01, 2017 USD ($)	Dec. 31, 2006 USD ($)	Oct. 03, 2005 USD ($) item	Sep. 30, 2004 USD ($) item	Aug. 31, 2004 USD ($) item	Nov. 30, 2001 USD ($) item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of limited partnerships and limited liability companies in which the entity has invested \| item															9
Number of partnerships investing in commercial property \| item															3
Investments in joint venture															$ 9,955,145		$ 8,336,505
Outstanding amount of mortgage															212,322,196		$ 212,709,080
Interest paid															2,472,000	$ 2,434,000
Distribution to the Partnership															1,119,687	936,925
Carrying value of investment to discontinue applying the equity method															0
Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)						40.00%
Investments in joint venture						$ 15,925,000
Number of units \| item						409
Purchase price of investments						$ 129,500,000
Dexter Park \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Outstanding amount of mortgage															83,119,000
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
Borrowings						$ 89,914,000
Hamilton Bay Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)																					50.00%
Investments in joint venture																					$ 2,500,000
Number of units \| item																					168
Number of units retained for long-term investment \| item																					48
Number of units sold \| item																					120
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
Hamilton Bay Sales
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Capital contributions					$ 660,000
Hamilton Bay Sales \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item											20
Interest rate (as a percent)											5.75%
Borrowings											$ 2,368,000
Hamilton Essex Development, LLC and Hamilton Essex 81, LLC
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)							50.00%
Investments in joint venture							$ 2,000,000
Purchase price of investments							14,300,000
Hamilton Essex Development, LLC and Hamilton Essex 81, LLC \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Borrowings							$ 10,750,000
Hamilton Essex 81
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item							48
Capital contributions				$ 100,000
Number of properties \| item							1
Distribution to the Partnership			$ 978,193
Hamilton Essex 81 \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Outstanding amount of mortgage															$ 10,000,000
Borrowings			$ 10,000,000
Term of debt			10 years
Hamilton Essex 81 \| Mortgages payable \| LIBOR
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Margin over basis of interest rate (as a percent)			2.18%
Hamilton Essex Development
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Capacity of real estate property (in cars per lot) \| item							50
Capital contributions				978,193
Hamilton Essex Development \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Repayment of loan				$ 1,952,286
Hamilton 1025
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)								50.00%
Investments in joint venture								$ 2,352,000
Number of units \| item								176
Number of units retained for long-term investment \| item								49							2
Number of units sold \| item								127							6		10
Purchase price of investments								$ 23,750,000
Capital contributions		$ 2,359,500
Hamilton 1025 \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)								5.67%
Period for which the entity is required to make interest only payments								5 years
Amortization period of debt								30 years
Borrowings								$ 5,000,000
Term of debt								10 years
Hamilton Minuteman
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)																						50.00%
Investments in joint venture																						$ 5,075,000
Outstanding amount of mortgage															$ 6,000,000
Number of units \| item																						42
Purchase price of investments																						$ 10,100,000
Amount returned to partnership														$ 3,775,000
Cash contribution by the entity towards loan																				$ 1,250,000
Hamilton Minuteman \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Mortgage amount	$ 6,000,000
Interest rate (as a percent)	3.71%												5.67%
Period for which the entity is required to make interest only payments	15 years												5 years
Amortization period of debt													30 years
Borrowings													$ 5,500,000	$ 8,025,000
Term of debt													10 years
Repayment of loan	$ 5,158,000
Distribution to the Partnership	$ 385,000
Hamilton on Main Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)																							50.00%
Investments in joint venture																							$ 8,000,000
Number of units \| item																							280
Number of units sold \| item																							137
Purchase price of investments																							$ 56,000,000
Hamilton on Main Apartments, LLC \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Outstanding amount of mortgage															16,900,000
Interest rate (as a percent)									4.34%									5.18%
Period for which the entity is required to make interest only payments																		3 years
Amortization period of debt																		30 years
Borrowings									$ 16,900,000									$ 16,825,000
Term of debt									10 years									10 years
Repayment of loan									$ 15,205,000
Cost associated with loan extension									$ 161,000
Term excluding period for which interest only payments to be made																		7 years
Net proceeds after funding escrow accounts and closing costs																		$ 16,700,000
345 Franklin
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)																								50.00%
Investments in joint venture																								$ 1,533,000
Number of units \| item																								40
Distribution to the Partnership										$ 1,610,000
345 Franklin \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)										3.87%
Period for which the entity is required to make interest only payments										3 years
Amortization period of debt										30 years
Borrowings										$ 10,000,000
Term of debt										15 years
Repayment of loan										$ 6,776,000
Investment Properties
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Investments in joint venture															$ 9,955,145	$ 7,440,487
Number of units \| property															1,033	1,033
Number of units retained for long-term investment \| property															(690)	(786)
Number of units sold \| property															264	244
Units to be sold \| property															343	247
Residential buildings \| Investment Properties
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| property															1,030	1,030
Apartment \| Hamilton Bay Sales
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units sold \| property																	4
Gain on Sale of Real Estate																	$ 337,000
Commercial \| Investment Properties
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| property															3	3
Management Company [Member]
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of employees having ownership interest in the investment properties \| item															6
Minimum \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)															2.80%
Minimum \| Limited Partnerships
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)															40.00%
Minimum \| Harold Brown
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)															43.20%
Maximum \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)															5.97%
Maximum \| Limited Partnerships
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)															50.00%
Maximum \| Harold Brown
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)															56.00%